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Variables Details
: (EM-884)
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EM-884 | |
Document Author
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McKane, R. B., A. Brookes, K. Djang, M. Stieglitz, A. G. Abdelnour, F. Pan, J. J. Halama, P. B. Pettus and D. L. Phillips |
Document Year
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2014 |
Air density |
Bulk density ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Bulk density: the dry weight of soil per unit volume of soil (g/cm3). |
DOC loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro DOC loss. |
DON loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro DON loss. |
Evapotranspiration calibration coefficient ?Comment:Evapotranspiration coefficient used in the logistic equation that computes ET from PET. |
Field capacity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Soil field capacity: the amount of soil moisture (v/v) held in soil after excess water has drained away and the rate of downward movement has materially decreased. |
Fraction of potential evapotranspiration available outside of the land cover's growing season ?Comment:Variable whose value is constant with respect to the driving class variable; Land cover. The fraction of PET available outside of this a cover species/type’s growing season range [0.0 - 1.0]. |
Initial uniform soil moisture ?Comment:Because soil moisture can vary significantly in space and time, it would be extremely difficult to specify realistic soil moisture amounts for every soil layer in every cell within a watershed. A more practical method is to specify a uniform amount of initial soil moisture for all layers and cells, and then allow these initial values to adjust to realistic levels during a “spin up” period of years prior to the simulated years of interest. By default, VELMA set the initial water content of all cells and layers to the field capacity value specified for each soil type. , i.e., when the parameter initialUniformSoilMoisture is set to its default value of -1 (if it is set to any other value, reset it to -1). |
Lateral decay rate of hydraulic conductivity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. Lateral Ks exponential decay factor (unitless) controlling the exponential rate of decrease in lateral flow with depth. |
NH4 loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro NH4 loss. |
NO3 loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro NO3 loss. |
Porosity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Soil porosity: the fraction of void space (v/v) in a soil. |
Potential evapotranspiration parameter 1 ?Comment:Variable whose value is constant with respect to the driving class variable; Land cover. First term of PET Hamon Equation: petParam1 * petParam2 * gS.roair * (esat / 1000.0f). |
Potential evapotranspiration parameter 2 ?Comment:Variable whose value is constant with respect to the driving class variable; Land cover. Second term of PET Hamon Equation: petParam1 * petParam2 * gS.roair * (esat / 1000.0f). |
Potential evapotranspiration temperature off (air) ?Comment:Variable whose value is constant with respect to the driving class variable; Land coiver. Potential evapotranspiration is only active when air temperature is > than this value (in degrees C). |
Rain on snow effect ?Comment:Used in conjunction with the snowMeltRate to determine the amount of snow that melts into surface water. |
Snow formation temperature (air) ?Comment:The air temperature (in degrees C) below which the day’s precipitation is counted as snow. At and above this temperature, it is counted as rain. |
Snow melt rate ?Comment:The rate at which melting snow becomes surface water. |
Snow melt temperature (air) ?Comment:The temperature above which any available snow begins to melt. |
Soil layer (layer 1,2,3,4) thickness ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. There are two methods, direct or indirect, that can be used to specify soil layer depths. The direct and indirect methods have their own distinct set of parameters that are available to each soil type specified for a given simulation configuration. Each method has its advantages. Thus, it is up to the user to decide which one to use. Either the direct or indirect set of parameters can be applied to a specified soil type, independent of which set is applied in other specified soil types. |
Soil surface saturated hydraulic conductivity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates vertical and lateral water drainage using a logistic function that is intended to capture the breakthrough characteristics of soil water movement. The logistic function provides a simple way (3 parameters) to capture the fast “switching” from low to high flow as water storage within a soil layer approaches field capacity. VELMA offers two alternative methods, direct or indirect, for specifying these parameters. However, because the direct method is still under development, we recommend that users use the indirect method. We refer to this method as an “indirect" because VELMA internally uses the specified soil Ks parameter values to calculate the actual soil lateral and vertical hydraulic conductivity (Ks) values used during the simulation run. |
Vertical decay rate of hydraulic conductivity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. Vertical Ks exponential decay factor (unitless) controlling the rate of decrease in vertical flow with depth. |
Wilt point ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Wilt Point: the minimal point of soil moisture (v/v) the plant requires not to wilt. |
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Variable ID
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21517 | 21513 | 21605 | 21604 | 21516 | 21510 | 21520 | 21534 | 21514 | 21602 | 21603 | 21511 | 21519 | 21518 | 21515 | 21546 | 21585 | 21587 | 21586 | 21549 | 21508 | 21509 | 21512 |
roair | Not reported | qf_DOC | qf_DON | be | Not reported | Not reported | Not reported | Not reported | qf_NH4 | qf_NO3 | Not reported | petParam1 | petParam2 | Not reported | Not reported | Not reported | Not reported | Not reported | Not reported | surfaceKs | Not reported | Not reported | |
Qualitative-Quantitative
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Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) |
Cardinal-Ordinal
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Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal |
g m^-3 | g cm^-3 | unitless (0-1) | unitless (0-1) | unitless | V V^-1 | % | unitless | unitless | unitless (0-1) | unitless (0-1) | V V^-1 | unitless | unitless | °C | unitless | °C | mm day^-1 | °C | mm | mm day^-1 | unitless | V V^-1 |
Air density |
Bulk density ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Bulk density: the dry weight of soil per unit volume of soil (g/cm3). |
DOC loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro DOC loss. |
DON loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro DON loss. |
Evapotranspiration calibration coefficient ?Comment:Evapotranspiration coefficient used in the logistic equation that computes ET from PET. |
Field capacity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Soil field capacity: the amount of soil moisture (v/v) held in soil after excess water has drained away and the rate of downward movement has materially decreased. |
Fraction of potential evapotranspiration available outside of the land cover's growing season ?Comment:Variable whose value is constant with respect to the driving class variable; Land cover. The fraction of PET available outside of this a cover species/type’s growing season range [0.0 - 1.0]. |
Initial uniform soil moisture ?Comment:Because soil moisture can vary significantly in space and time, it would be extremely difficult to specify realistic soil moisture amounts for every soil layer in every cell within a watershed. A more practical method is to specify a uniform amount of initial soil moisture for all layers and cells, and then allow these initial values to adjust to realistic levels during a “spin up” period of years prior to the simulated years of interest. By default, VELMA set the initial water content of all cells and layers to the field capacity value specified for each soil type. , i.e., when the parameter initialUniformSoilMoisture is set to its default value of -1 (if it is set to any other value, reset it to -1). |
Lateral decay rate of hydraulic conductivity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. Lateral Ks exponential decay factor (unitless) controlling the exponential rate of decrease in lateral flow with depth. |
NH4 loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro NH4 loss. |
NO3 loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro NO3 loss. |
Porosity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Soil porosity: the fraction of void space (v/v) in a soil. |
Potential evapotranspiration parameter 1 ?Comment:Variable whose value is constant with respect to the driving class variable; Land cover. First term of PET Hamon Equation: petParam1 * petParam2 * gS.roair * (esat / 1000.0f). |
Potential evapotranspiration parameter 2 ?Comment:Variable whose value is constant with respect to the driving class variable; Land cover. Second term of PET Hamon Equation: petParam1 * petParam2 * gS.roair * (esat / 1000.0f). |
Potential evapotranspiration temperature off (air) ?Comment:Variable whose value is constant with respect to the driving class variable; Land coiver. Potential evapotranspiration is only active when air temperature is > than this value (in degrees C). |
Rain on snow effect ?Comment:Used in conjunction with the snowMeltRate to determine the amount of snow that melts into surface water. |
Snow formation temperature (air) ?Comment:The air temperature (in degrees C) below which the day’s precipitation is counted as snow. At and above this temperature, it is counted as rain. |
Snow melt rate ?Comment:The rate at which melting snow becomes surface water. |
Snow melt temperature (air) ?Comment:The temperature above which any available snow begins to melt. |
Soil layer (layer 1,2,3,4) thickness ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. There are two methods, direct or indirect, that can be used to specify soil layer depths. The direct and indirect methods have their own distinct set of parameters that are available to each soil type specified for a given simulation configuration. Each method has its advantages. Thus, it is up to the user to decide which one to use. Either the direct or indirect set of parameters can be applied to a specified soil type, independent of which set is applied in other specified soil types. |
Soil surface saturated hydraulic conductivity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates vertical and lateral water drainage using a logistic function that is intended to capture the breakthrough characteristics of soil water movement. The logistic function provides a simple way (3 parameters) to capture the fast “switching” from low to high flow as water storage within a soil layer approaches field capacity. VELMA offers two alternative methods, direct or indirect, for specifying these parameters. However, because the direct method is still under development, we recommend that users use the indirect method. We refer to this method as an “indirect" because VELMA internally uses the specified soil Ks parameter values to calculate the actual soil lateral and vertical hydraulic conductivity (Ks) values used during the simulation run. |
Vertical decay rate of hydraulic conductivity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. Vertical Ks exponential decay factor (unitless) controlling the rate of decrease in vertical flow with depth. |
Wilt point ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Wilt Point: the minimal point of soil moisture (v/v) the plant requires not to wilt. |
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Predictor-Intermediate-Response
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Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor Variable Type
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Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter | Constant or Parameter |
Response Variable Type
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
Data Source/Type
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Not applicable | Not applicable | Derived/adjusted by calibration | Derived/adjusted by calibration | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Derived/adjusted by calibration | Derived/adjusted by calibration | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
Variable Classification Hierarchy
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5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Chemical (C, N, P, sediment/particulate) characteristics of ecosystem components |
--Chemical (C, N, P, sediment/particulate) characteristics of ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Chemical (C, N, P, sediment/particulate) characteristics of ecosystem components |
--Chemical (C, N, P, sediment/particulate) characteristics of ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
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----Physical/chemical characteristics of air, meteorology and precipitation |
----Physical/chemical characteristics of soils, substrates, rocks |
----Carbon-related characteristics of ecosystem components |
----Nitrogen-related characteristics of ecosystem components |
----Physical/chemical characteristics of water |
----Physical/chemical characteristics of soils, substrates, rocks |
----Physical/chemical characteristics of water |
----Physical/chemical characteristics of soils, substrates, rocks |
----Physical/chemical characteristics of soils, substrates, rocks |
----Nitrogen-related characteristics of ecosystem components |
----Nitrogen-related characteristics of ecosystem components |
----Physical/chemical characteristics of soils, substrates, rocks |
----Physical/chemical characteristics of water |
----Physical/chemical characteristics of water |
----Physical/chemical characteristics of air, meteorology and precipitation |
----Physical/chemical characteristics of air, meteorology and precipitation |
----Physical/chemical characteristics of air, meteorology and precipitation |
----Physical/chemical characteristics of air, meteorology and precipitation |
----Physical/chemical characteristics of air, meteorology and precipitation |
----Physical/chemical characteristics of soils, substrates, rocks |
----Physical/chemical characteristics of soils, substrates, rocks |
----Physical/chemical characteristics of soils, substrates, rocks |
----Physical/chemical characteristics of soils, substrates, rocks |
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------Meteorology data and parameters (including precipitation) |
------Soil structural characteristics |
------Carbon accumulation by terrestrial or aquatic ecosystem components |
------Nitrogen presence (in terrestrial ecosystem components) |
------Evapotranspiration (via soil and/or vegetation) |
------Soil hydrologic characteristics |
------Evapotranspiration (via soil and/or vegetation) |
------Soil hydrologic characteristics |
------Soil hydrologic characteristics |
------Reactive nitrogen accumulation or attenuation by terrestrial or aquatic ecosystem components |
------Reactive nitrogen accumulation or attenuation by terrestrial or aquatic ecosystem components |
------Soil structural characteristics |
------Evapotranspiration (via soil and/or vegetation) |
------Evapotranspiration (via soil and/or vegetation) |
------Meteorology data and parameters (including precipitation) |
------Meteorology data and parameters (including precipitation) |
------Meteorology data and parameters (including precipitation) |
------Meteorology data and parameters (including precipitation) |
------Meteorology data and parameters (including precipitation) |
------Soil layer thickness |
------Soil hydrologic characteristics |
------Soil hydrologic characteristics |
------Soil hydrologic characteristics |
Air density |
Bulk density ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Bulk density: the dry weight of soil per unit volume of soil (g/cm3). |
DOC loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro DOC loss. |
DON loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro DON loss. |
Evapotranspiration calibration coefficient ?Comment:Evapotranspiration coefficient used in the logistic equation that computes ET from PET. |
Field capacity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Soil field capacity: the amount of soil moisture (v/v) held in soil after excess water has drained away and the rate of downward movement has materially decreased. |
Fraction of potential evapotranspiration available outside of the land cover's growing season ?Comment:Variable whose value is constant with respect to the driving class variable; Land cover. The fraction of PET available outside of this a cover species/type’s growing season range [0.0 - 1.0]. |
Initial uniform soil moisture ?Comment:Because soil moisture can vary significantly in space and time, it would be extremely difficult to specify realistic soil moisture amounts for every soil layer in every cell within a watershed. A more practical method is to specify a uniform amount of initial soil moisture for all layers and cells, and then allow these initial values to adjust to realistic levels during a “spin up” period of years prior to the simulated years of interest. By default, VELMA set the initial water content of all cells and layers to the field capacity value specified for each soil type. , i.e., when the parameter initialUniformSoilMoisture is set to its default value of -1 (if it is set to any other value, reset it to -1). |
Lateral decay rate of hydraulic conductivity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. Lateral Ks exponential decay factor (unitless) controlling the exponential rate of decrease in lateral flow with depth. |
NH4 loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro NH4 loss. |
NO3 loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro NO3 loss. |
Porosity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Soil porosity: the fraction of void space (v/v) in a soil. |
Potential evapotranspiration parameter 1 ?Comment:Variable whose value is constant with respect to the driving class variable; Land cover. First term of PET Hamon Equation: petParam1 * petParam2 * gS.roair * (esat / 1000.0f). |
Potential evapotranspiration parameter 2 ?Comment:Variable whose value is constant with respect to the driving class variable; Land cover. Second term of PET Hamon Equation: petParam1 * petParam2 * gS.roair * (esat / 1000.0f). |
Potential evapotranspiration temperature off (air) ?Comment:Variable whose value is constant with respect to the driving class variable; Land coiver. Potential evapotranspiration is only active when air temperature is > than this value (in degrees C). |
Rain on snow effect ?Comment:Used in conjunction with the snowMeltRate to determine the amount of snow that melts into surface water. |
Snow formation temperature (air) ?Comment:The air temperature (in degrees C) below which the day’s precipitation is counted as snow. At and above this temperature, it is counted as rain. |
Snow melt rate ?Comment:The rate at which melting snow becomes surface water. |
Snow melt temperature (air) ?Comment:The temperature above which any available snow begins to melt. |
Soil layer (layer 1,2,3,4) thickness ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. There are two methods, direct or indirect, that can be used to specify soil layer depths. The direct and indirect methods have their own distinct set of parameters that are available to each soil type specified for a given simulation configuration. Each method has its advantages. Thus, it is up to the user to decide which one to use. Either the direct or indirect set of parameters can be applied to a specified soil type, independent of which set is applied in other specified soil types. |
Soil surface saturated hydraulic conductivity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates vertical and lateral water drainage using a logistic function that is intended to capture the breakthrough characteristics of soil water movement. The logistic function provides a simple way (3 parameters) to capture the fast “switching” from low to high flow as water storage within a soil layer approaches field capacity. VELMA offers two alternative methods, direct or indirect, for specifying these parameters. However, because the direct method is still under development, we recommend that users use the indirect method. We refer to this method as an “indirect" because VELMA internally uses the specified soil Ks parameter values to calculate the actual soil lateral and vertical hydraulic conductivity (Ks) values used during the simulation run. |
Vertical decay rate of hydraulic conductivity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. Vertical Ks exponential decay factor (unitless) controlling the rate of decrease in vertical flow with depth. |
Wilt point ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Wilt Point: the minimal point of soil moisture (v/v) the plant requires not to wilt. |
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Spatial Extent Area
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
Spatially Distributed?
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
Observations Spatially Patterned?
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
Spatial Grain Type
variable.detail.spGrainTypeHelp
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Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables | Not recorded for Constant or Paarameter Variables |
Spatial Grain Size
variable.detail.spGrainSizeHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
Spatial Density
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
EnviroAtlas URL
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Average Annual Precipitation | Carbon Storage by Tree Biomass | Total Annual Reduced Nitrogen Deposition | Total Annual Reduced Nitrogen Deposition | Average Annual Precipitation | Average Annual Precipitation | Average Annual Precipitation | Average Annual Precipitation | Average Annual Precipitation |
Air density |
Bulk density ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Bulk density: the dry weight of soil per unit volume of soil (g/cm3). |
DOC loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro DOC loss. |
DON loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro DON loss. |
Evapotranspiration calibration coefficient ?Comment:Evapotranspiration coefficient used in the logistic equation that computes ET from PET. |
Field capacity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Soil field capacity: the amount of soil moisture (v/v) held in soil after excess water has drained away and the rate of downward movement has materially decreased. |
Fraction of potential evapotranspiration available outside of the land cover's growing season ?Comment:Variable whose value is constant with respect to the driving class variable; Land cover. The fraction of PET available outside of this a cover species/type’s growing season range [0.0 - 1.0]. |
Initial uniform soil moisture ?Comment:Because soil moisture can vary significantly in space and time, it would be extremely difficult to specify realistic soil moisture amounts for every soil layer in every cell within a watershed. A more practical method is to specify a uniform amount of initial soil moisture for all layers and cells, and then allow these initial values to adjust to realistic levels during a “spin up” period of years prior to the simulated years of interest. By default, VELMA set the initial water content of all cells and layers to the field capacity value specified for each soil type. , i.e., when the parameter initialUniformSoilMoisture is set to its default value of -1 (if it is set to any other value, reset it to -1). |
Lateral decay rate of hydraulic conductivity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. Lateral Ks exponential decay factor (unitless) controlling the exponential rate of decrease in lateral flow with depth. |
NH4 loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro NH4 loss. |
NO3 loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro NO3 loss. |
Porosity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Soil porosity: the fraction of void space (v/v) in a soil. |
Potential evapotranspiration parameter 1 ?Comment:Variable whose value is constant with respect to the driving class variable; Land cover. First term of PET Hamon Equation: petParam1 * petParam2 * gS.roair * (esat / 1000.0f). |
Potential evapotranspiration parameter 2 ?Comment:Variable whose value is constant with respect to the driving class variable; Land cover. Second term of PET Hamon Equation: petParam1 * petParam2 * gS.roair * (esat / 1000.0f). |
Potential evapotranspiration temperature off (air) ?Comment:Variable whose value is constant with respect to the driving class variable; Land coiver. Potential evapotranspiration is only active when air temperature is > than this value (in degrees C). |
Rain on snow effect ?Comment:Used in conjunction with the snowMeltRate to determine the amount of snow that melts into surface water. |
Snow formation temperature (air) ?Comment:The air temperature (in degrees C) below which the day’s precipitation is counted as snow. At and above this temperature, it is counted as rain. |
Snow melt rate ?Comment:The rate at which melting snow becomes surface water. |
Snow melt temperature (air) ?Comment:The temperature above which any available snow begins to melt. |
Soil layer (layer 1,2,3,4) thickness ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. There are two methods, direct or indirect, that can be used to specify soil layer depths. The direct and indirect methods have their own distinct set of parameters that are available to each soil type specified for a given simulation configuration. Each method has its advantages. Thus, it is up to the user to decide which one to use. Either the direct or indirect set of parameters can be applied to a specified soil type, independent of which set is applied in other specified soil types. |
Soil surface saturated hydraulic conductivity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates vertical and lateral water drainage using a logistic function that is intended to capture the breakthrough characteristics of soil water movement. The logistic function provides a simple way (3 parameters) to capture the fast “switching” from low to high flow as water storage within a soil layer approaches field capacity. VELMA offers two alternative methods, direct or indirect, for specifying these parameters. However, because the direct method is still under development, we recommend that users use the indirect method. We refer to this method as an “indirect" because VELMA internally uses the specified soil Ks parameter values to calculate the actual soil lateral and vertical hydraulic conductivity (Ks) values used during the simulation run. |
Vertical decay rate of hydraulic conductivity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. Vertical Ks exponential decay factor (unitless) controlling the rate of decrease in vertical flow with depth. |
Wilt point ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Wilt Point: the minimal point of soil moisture (v/v) the plant requires not to wilt. |
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Temporal Extent
variable.detail.tempExtentHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
Temporally Distributed?
variable.detail.tempDistributedHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
Regular Temporal Grain?
variable.detail.regularTempGrainHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
Temporal Grain Size Value
variable.detail.tempGrainSizeValHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
Temporal Grain Size Units
variable.detail.tempGrainSizeUnitHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
Temporal Density
variable.detail.tempDensityHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
Air density |
Bulk density ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Bulk density: the dry weight of soil per unit volume of soil (g/cm3). |
DOC loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro DOC loss. |
DON loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro DON loss. |
Evapotranspiration calibration coefficient ?Comment:Evapotranspiration coefficient used in the logistic equation that computes ET from PET. |
Field capacity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Soil field capacity: the amount of soil moisture (v/v) held in soil after excess water has drained away and the rate of downward movement has materially decreased. |
Fraction of potential evapotranspiration available outside of the land cover's growing season ?Comment:Variable whose value is constant with respect to the driving class variable; Land cover. The fraction of PET available outside of this a cover species/type’s growing season range [0.0 - 1.0]. |
Initial uniform soil moisture ?Comment:Because soil moisture can vary significantly in space and time, it would be extremely difficult to specify realistic soil moisture amounts for every soil layer in every cell within a watershed. A more practical method is to specify a uniform amount of initial soil moisture for all layers and cells, and then allow these initial values to adjust to realistic levels during a “spin up” period of years prior to the simulated years of interest. By default, VELMA set the initial water content of all cells and layers to the field capacity value specified for each soil type. , i.e., when the parameter initialUniformSoilMoisture is set to its default value of -1 (if it is set to any other value, reset it to -1). |
Lateral decay rate of hydraulic conductivity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. Lateral Ks exponential decay factor (unitless) controlling the exponential rate of decrease in lateral flow with depth. |
NH4 loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro NH4 loss. |
NO3 loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro NO3 loss. |
Porosity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Soil porosity: the fraction of void space (v/v) in a soil. |
Potential evapotranspiration parameter 1 ?Comment:Variable whose value is constant with respect to the driving class variable; Land cover. First term of PET Hamon Equation: petParam1 * petParam2 * gS.roair * (esat / 1000.0f). |
Potential evapotranspiration parameter 2 ?Comment:Variable whose value is constant with respect to the driving class variable; Land cover. Second term of PET Hamon Equation: petParam1 * petParam2 * gS.roair * (esat / 1000.0f). |
Potential evapotranspiration temperature off (air) ?Comment:Variable whose value is constant with respect to the driving class variable; Land coiver. Potential evapotranspiration is only active when air temperature is > than this value (in degrees C). |
Rain on snow effect ?Comment:Used in conjunction with the snowMeltRate to determine the amount of snow that melts into surface water. |
Snow formation temperature (air) ?Comment:The air temperature (in degrees C) below which the day’s precipitation is counted as snow. At and above this temperature, it is counted as rain. |
Snow melt rate ?Comment:The rate at which melting snow becomes surface water. |
Snow melt temperature (air) ?Comment:The temperature above which any available snow begins to melt. |
Soil layer (layer 1,2,3,4) thickness ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. There are two methods, direct or indirect, that can be used to specify soil layer depths. The direct and indirect methods have their own distinct set of parameters that are available to each soil type specified for a given simulation configuration. Each method has its advantages. Thus, it is up to the user to decide which one to use. Either the direct or indirect set of parameters can be applied to a specified soil type, independent of which set is applied in other specified soil types. |
Soil surface saturated hydraulic conductivity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates vertical and lateral water drainage using a logistic function that is intended to capture the breakthrough characteristics of soil water movement. The logistic function provides a simple way (3 parameters) to capture the fast “switching” from low to high flow as water storage within a soil layer approaches field capacity. VELMA offers two alternative methods, direct or indirect, for specifying these parameters. However, because the direct method is still under development, we recommend that users use the indirect method. We refer to this method as an “indirect" because VELMA internally uses the specified soil Ks parameter values to calculate the actual soil lateral and vertical hydraulic conductivity (Ks) values used during the simulation run. |
Vertical decay rate of hydraulic conductivity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. Vertical Ks exponential decay factor (unitless) controlling the rate of decrease in vertical flow with depth. |
Wilt point ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Wilt Point: the minimal point of soil moisture (v/v) the plant requires not to wilt. |
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | |
Min Value
variable.detail.minEstHelp
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
Max Value
variable.detail.estHelp
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
Other Value Type
variable.detail.natureOtherEstHelp
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
Other Value
variable.detail.otherEstHelp
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
Air density |
Bulk density ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Bulk density: the dry weight of soil per unit volume of soil (g/cm3). |
DOC loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro DOC loss. |
DON loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro DON loss. |
Evapotranspiration calibration coefficient ?Comment:Evapotranspiration coefficient used in the logistic equation that computes ET from PET. |
Field capacity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Soil field capacity: the amount of soil moisture (v/v) held in soil after excess water has drained away and the rate of downward movement has materially decreased. |
Fraction of potential evapotranspiration available outside of the land cover's growing season ?Comment:Variable whose value is constant with respect to the driving class variable; Land cover. The fraction of PET available outside of this a cover species/type’s growing season range [0.0 - 1.0]. |
Initial uniform soil moisture ?Comment:Because soil moisture can vary significantly in space and time, it would be extremely difficult to specify realistic soil moisture amounts for every soil layer in every cell within a watershed. A more practical method is to specify a uniform amount of initial soil moisture for all layers and cells, and then allow these initial values to adjust to realistic levels during a “spin up” period of years prior to the simulated years of interest. By default, VELMA set the initial water content of all cells and layers to the field capacity value specified for each soil type. , i.e., when the parameter initialUniformSoilMoisture is set to its default value of -1 (if it is set to any other value, reset it to -1). |
Lateral decay rate of hydraulic conductivity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. Lateral Ks exponential decay factor (unitless) controlling the exponential rate of decrease in lateral flow with depth. |
NH4 loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro NH4 loss. |
NO3 loss due to horizontal and vertical water flow ?Comment:Optional variable calibrated in the computation of daily hydro NO3 loss. |
Porosity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Soil porosity: the fraction of void space (v/v) in a soil. |
Potential evapotranspiration parameter 1 ?Comment:Variable whose value is constant with respect to the driving class variable; Land cover. First term of PET Hamon Equation: petParam1 * petParam2 * gS.roair * (esat / 1000.0f). |
Potential evapotranspiration parameter 2 ?Comment:Variable whose value is constant with respect to the driving class variable; Land cover. Second term of PET Hamon Equation: petParam1 * petParam2 * gS.roair * (esat / 1000.0f). |
Potential evapotranspiration temperature off (air) ?Comment:Variable whose value is constant with respect to the driving class variable; Land coiver. Potential evapotranspiration is only active when air temperature is > than this value (in degrees C). |
Rain on snow effect ?Comment:Used in conjunction with the snowMeltRate to determine the amount of snow that melts into surface water. |
Snow formation temperature (air) ?Comment:The air temperature (in degrees C) below which the day’s precipitation is counted as snow. At and above this temperature, it is counted as rain. |
Snow melt rate ?Comment:The rate at which melting snow becomes surface water. |
Snow melt temperature (air) ?Comment:The temperature above which any available snow begins to melt. |
Soil layer (layer 1,2,3,4) thickness ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. There are two methods, direct or indirect, that can be used to specify soil layer depths. The direct and indirect methods have their own distinct set of parameters that are available to each soil type specified for a given simulation configuration. Each method has its advantages. Thus, it is up to the user to decide which one to use. Either the direct or indirect set of parameters can be applied to a specified soil type, independent of which set is applied in other specified soil types. |
Soil surface saturated hydraulic conductivity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates vertical and lateral water drainage using a logistic function that is intended to capture the breakthrough characteristics of soil water movement. The logistic function provides a simple way (3 parameters) to capture the fast “switching” from low to high flow as water storage within a soil layer approaches field capacity. VELMA offers two alternative methods, direct or indirect, for specifying these parameters. However, because the direct method is still under development, we recommend that users use the indirect method. We refer to this method as an “indirect" because VELMA internally uses the specified soil Ks parameter values to calculate the actual soil lateral and vertical hydraulic conductivity (Ks) values used during the simulation run. |
Vertical decay rate of hydraulic conductivity ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. Vertical Ks exponential decay factor (unitless) controlling the rate of decrease in vertical flow with depth. |
Wilt point ?Comment:Variable whose value is constant with respect to the driving class variable; Soil type. VELMA simulates the effect of several soil physical properties on water retention, rates of drainage and other hydrological processes. Wilt Point: the minimal point of soil moisture (v/v) the plant requires not to wilt. |
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Variability Expression Given?
variable.detail.variabilityExpHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
Variability Metric
variable.detail.variabilityMetricHelp
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None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None |
Variability Value
variable.detail.variabilityValueHelp
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None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None |
Variability Units
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None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None |
Resampling Used?
variable.detail.bootstrappingHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
Variability Expression Used in Modeling?
variable.detail.variabilityUsedHelp
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Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables | Not recorded for Constant or Parameter Variables |
Variable ID
variable.detail.varIdHelp
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Validated?
variable.detail.resValidatedHelp
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Validation Approach (within, between, etc.)
variable.detail.validationApproachHelp
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Validation Quality (Qual/Quant)
variable.detail.validationQualityHelp
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Validation Method (Stat/Deviance)
variable.detail.validationMethodHelp
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Validation Metric
variable.detail.validationMetricHelp
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Validation Value
variable.detail.validationValHelp
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Validation Units
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Use of Measured Response Data
variable.detail.measuredResponseDataHelp
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