Hydrology and Sedimentology of Dynamic Rill Networks. Volume 2. Erosion Model forDynamic Rill Networks

摘要

A comprehensive model has been developed for use in modeling the hydrologicresponse of rill network systems. The model, which is called HYMODRIN, is composed of both a hydrologic runoff component and a hydraulic channel routing component. The hydrologic component of the model uses a Green Ampt infiltration approach linked with a nonlinear reservoir runoff model. The channel routing component of the model is based on a finite element solution of the diffusion wave equations. In order to account for backwater effects the model employs a dual level iteration scheme. The model may be used in either a stand alone mode or as a part of a comprehensive integrated rill erosion model. In the latter case, the hydrologic data for the rill network and the associated interrill flow areas is provided by a geographic-hydrologic interface model called GHIM. The model accepts data from a digital elevation model and translates it into a form compatible with the hydrologic model. The report contains the theoretical development and operating instructions for both GHIM and HYMODRIN. Computer listing for both programs are provided.