Start Date: Oct 25, 2010
End Date: Oct 24, 2015
1. a) Extend WEPS beyond the current homogenous simulation area approach to improve simulation of field-scale variability by: i) further modularizing the erosion science code, ii) adding sub-field capability, iii) refining WEPS gridding algorithms, and iv) adding landscape terrain effects to WEPS; b) improve model inputs and science for WEPS through: i) updating weather, ii) adding crop competition and improved crop growth, iii) adding seasonal wind barrier porosity variability, and iv) improving soil and vegetation measurements with laser distance techniques; c) extend WEPS to additional soil types (i.e., organic dominated soils) and treatments (i.e., applied biosolids); and d) modify WEPS for application to special problems (i.e., regional air quality modeling, add PM2.5 emission, batch mode for WEPS, develop a single-event model); and e) publish the WEPS technical document. 2. Utilize common science and interface code for WEPP and WEPS to: a) provide common runoff and evaporation processes between the two models; b) provide common “winter processes” (simulation of freezing, thawing, freeze-drying processes); c) add water erosion specific input (hillslope length, slope, etc.) and output (water erosion, runoff, etc.) to the current standalone WEPS interface; d) address restrictions to simulating a homogeneous region represented by a single soil with common management practices applied to the entire field; and e) provide the necessary inputs to represent water erosion specific practices, such as terraces, artificial drainage, etc. to the user interface.