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EM: APEX (Agricultural Policy/Environmental eXtender Model) v1501 (EM-592)
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EM Identity and Description
EM Identification
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EM ID
em.detail.idHelp
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EM-592 |
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EM Short Name
em.detail.shortNameHelp
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APEX v1501 |
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EM Full Name
em.detail.fullNameHelp
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APEX (Agricultural Policy/Environmental eXtender Model) v1501 |
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EM Source or Collection
em.detail.emSourceOrCollectionHelp
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None |
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EM Source Document ID
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357 |
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Document Author
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Steglich, E. M., J. Jeong and J. R. Williams |
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Document Year
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2016 |
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Document Title
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Agricultural Policy/Environmental eXtender Model User's Manual Version 1501 |
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Document Status
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Peer reviewed and published |
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Comments on Status
em.detail.commentsOnStatusHelp
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Published report |
Software and Access
| https://epicapex.tamu.edu/manuals-and-publications/ | |
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Contact Name
em.detail.contactNameHelp
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E. M. Steglich |
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Contact Address
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Blackland Research and Extension Center, 720 East Blackland Road, Temple, TX 76502 |
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Contact Email
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epicapex@brc.tamus.edu |
EM Description
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Summary Description
em.detail.summaryDescriptionHelp
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ABSTRACT: "APEX is a tool for managing whole farms or small watersheds to obtain sustainable production efficiency and maintain environmental quality. APEX operates on a daily time step and is capable of performing long term simulations (1-4000 years) at the whole farm or small watershed level. The watershed may be divided into many homogeneous (soils, land use, topography, etc.) subareas (<4000). The routing component simulates flow from one subarea to another through channels and flood plains to the watershed outlet and transports sediment, nutrients, and pesticides. This allows evaluation of interactions between fields in respect to surface run-on, sediment deposition and degradation, nutrient and pesticide transport and subsurface flow. Effects of terrace systems, grass waterways, strip cropping, buffer strips/vegetated filter strips, crop rotations, plant competition, plant burning, grazing patterns of multiple herds, fertilizer, irrigation, liming, furrow diking, drainage systems, and manure management (feed yards and dairies with or without lagoons) can be simulated and assessed. Most recent developments in APEX1501 include: • Flexible grazing schedule of multiple owners and herds across landscape and paddocks. • Wind dust distribution from feedlots. • Manure erosion from feedlots and grazing fields. • Optional pipe and crack flow in soil due to tree root growth. • Enhanced filter strip consideration. • Extended lagoon pumping and manure scraping options. • Enhanced burning operation. • Carbon pools and transformation equations similar to those in the Century model with the addition of the Phoenix C/N microbial biomass model. • Enhanced water table monitoring. • Enhanced denitrification methods. • Variable saturation hydraulic conductivity method. • Irrigation using reservoir and well reserves. • Paddy module for use with rice or wetland areas." |
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Specific Policy or Decision Context Cited
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None identified |
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Biophysical Context
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No additional description provided |
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EM Scenario Drivers
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No scenarios presented |
EM Relationship to Other EMs or Applications
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Method Only, Application of Method or Model Run
em.detail.methodOrAppHelp
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Method Only |
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New or Pre-existing EM?
em.detail.newOrExistHelp
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New or revised model |
Related EMs (for example, other versions or derivations of this EM) described in ESML
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Document ID for related EM
em.detail.relatedEmDocumentIdHelp
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None |
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EM ID for related EM
em.detail.relatedEmEmIdHelp
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None |
EM Modeling Approach
EM Relationship to Time
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EM Temporal Extent
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Not applicable |
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EM Time Dependence
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time-dependent |
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EM Time Reference (Future/Past)
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Not applicable |
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EM Time Continuity
em.detail.continueDiscreteHelp
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discrete |
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EM Temporal Grain Size Value
em.detail.tempGrainSizeHelp
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1 |
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EM Temporal Grain Size Unit
em.detail.tempGrainSizeUnitHelp
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Day |
EM Spatial Extent
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Bounding Type
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Not applicable |
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Spatial Extent Name
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Not applicable |
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Spatial Extent Area (Magnitude)
em.detail.extentAreaHelp
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Not applicable |
Spatial Distribution of Computations
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EM Spatial Distribution
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spatially distributed (in at least some cases) |
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Spatial Grain Type
em.detail.spGrainTypeHelp
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other (specify), for irregular (e.g., stream reach, lake basin) |
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Spatial Grain Size
em.detail.spGrainSizeHelp
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homogenous subareas |
EM Structure and Computation Approach
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EM Computational Approach
em.detail.emComputationalApproachHelp
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Numeric |
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EM Determinism
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deterministic |
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Statistical Estimation of EM
em.detail.statisticalEstimationHelp
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Model Checking Procedures Used
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Model Calibration Reported?
em.detail.calibrationHelp
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Not applicable |
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Model Goodness of Fit Reported?
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Not applicable |
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Goodness of Fit (metric| value | unit)
em.detail.goodnessFitValuesHelp
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None |
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Model Operational Validation Reported?
em.detail.validationHelp
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Not applicable |
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Model Uncertainty Analysis Reported?
em.detail.uncertaintyAnalysisHelp
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Not applicable |
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Model Sensitivity Analysis Reported?
em.detail.sensAnalysisHelp
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Not applicable |
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Model Sensitivity Analysis Include Interactions?
em.detail.interactionConsiderHelp
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Not applicable |
EM Locations, Environments, Ecology
Location of EM Application
Terrestrial location (Classification hierarchy: Continent > Country > U.S. State [United States only])
em.detail.relationToSpaceTerrestrialHelp
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| None |
Marine location (Classification hierarchy: Realm > Region > Province > Ecoregion)
em.detail.relationToSpaceMarineHelp
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| None |
Centroid Lat/Long (Decimal Degree)
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Centroid Latitude
em.detail.ddLatHelp
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Not applicable |
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Centroid Longitude
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Not applicable |
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Centroid Datum
em.detail.datumHelp
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Not applicable |
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Centroid Coordinates Status
em.detail.coordinateStatusHelp
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Not applicable |
Environments and Scales Modeled
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EM Environmental Sub-Class
em.detail.emEnvironmentalSubclassHelp
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Agroecosystems |
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Specific Environment Type
em.detail.specificEnvTypeHelp
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Terrestrial environment associated with agroecosystems |
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EM Ecological Scale
em.detail.ecoScaleHelp
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Ecological scale is finer than that of the Environmental Sub-class |
Scale and taxa of organisms modeled
Scale of differentiation of organisms modeled
em.detail.nameOfOrgsOrGroupsHelp
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EM Organismal Scale
em.detail.orgScaleHelp
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Not applicable |
Taxonomic level and name of organisms or groups identified
taxonomyHelp
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| None Available |
EnviroAtlas URL
em.detail.enviroAtlasURLHelp
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EM Ecosystem Goods and Services (EGS) potentially modeled, by classification system
CICES v 4.3 - Common International Classification of Ecosystem Services (Section > Division > Group > Class)
em.detail.cicesHelp
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(Environmental Subclass > Ecological End-Product (EEP) > EEP Subclass > EEP Modifier)
fegs2Help
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EM Variable Names (and Units)
Predictor
em.detail.variablesPredictorHelp
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Intermediate
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Intermediate (Computed) Variables (and Units)
em.detail.intermediateVariableHelp
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None |
Response
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