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The management submodel of the wind erosion prediction system

L. E. Wagner, F. A. Fox
Applied engineering in agriculture 2013 v.29 no.3 pp. 361-372
biodegradation, biomass, burning, crop residue management, crop residues, crops, databases, furrows, harvesting, irrigation, land management, mixing, plant growth, planting, porosity, prediction, roughness, soil aggregates, soil amendments, soil crusts, soil erosion models, soil water movement, sowing, surface roughness, wind erosion
The Wind Erosion Prediction System (WEPS) is a process-based, daily time-step computer model that predicts soil erosion via the simulation of the physical processes controlling wind erosion. WEPS is comprised of five databases and several submodels which reflect the physical processes of erosion, soil water movement, plant growth, residue decomposition, dynamic soil properties, and management practices. This article describes the WEPS management submodel component which simulates the effects of typical cropping management practices, such as tillage, planting, harvesting, irrigation, or residue burning, at an operational level. Such management practices can affect the surface conditions, which in turn affect wind erosion potential. A variety of land management operations is simulated by identifying the primary physical processes involved and representing each individual operation as a sequenced set of those processes. The process categories include: 1) surface modification (the creation or destruction of ridges and/or furrow dikes that form oriented surface roughness, change the surface random roughness, and destroy the soil crust); 2) mass manipulation within soil layers (the changes in the aggregate size distribution and soil porosity, the mixing of soil and residue among soil layers, and soil layer inversion); 3) biomass manipulation (burying and resurfacing of residue, clipping the standing residue, flattening the standing residue, killing the live crop biomass, and removing biomass); and 4) soil amendments (the application of residue/manure for cover, seeding or planting crops, and irrigation).