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United States Department of Agriculture

Agricultural Research Service

Title: Wind Erosion Processes in Weps: Validation of Erosion Predictions on Small Fields

Author
item Hagen, Lawrence

Submitted to: ASAE Annual International Meeting
Publication Type: Abstract Only
Publication Acceptance Date: July 18, 1999
Publication Date: July 18, 1999
Citation: International ASAE meeting; 1999 Jul 18-21; Tornonto, Canada.

Technical Abstract: The Wind Erosion Prediction System (WEPS) is a process-based, modular model containing 7 submodels designed to simulate daily weather, field surface conditions, and wind erosion loss or deposition. This report compares the WEPS erosion submodel predictions of soil loss to the soil loss measured on a number of small fields with a range of soil textures in several states. The field data consist of daily meteorological variables, periodic measurements of surface conditions, and vertical profiles of discharge of wind-blown (kg/m) soil for individual storms. Four different empirical regression equations were fit to the measured point soil discharge at various downwind distances from the field boundary to estimate the measured soil discharge at 180 m downwind for each storm. There was considerable scatter in the measured discharge values and coefficients of determination (R2) for the best empirical equations ranged from 0.47 to 0.93 for the various fields. To provide model inputs, Weibull distributions were fit to the measured wind data on storm-days, and these were used to generate daily wind speed distributions. Part of the needed input surface variables were available from the measured surface conditions, and the remainder were estimated for model inputs. The erosion submodel predictions provided reasonable estimates of measured storm soil losses (R2 = 0.72).

Last Modified: 9/29/2014
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