Hillslope soil erosion and runoff model for natural rainfall events

By using the momentum theorem and water- balance principle,basic equations of slope runoff were derived,soil erosion by raindrop splash and runoff were dis- cussed and a model was established for decribing hillslope soil erosion processes.The numerical solution of the model was obtained by adopting the Preissmann format and consi- dering the common solution-determining conditions,from which not only the runoff and soil erosion but also their pro- cesses can be described.The model was validated by ten groups of observation data of Soil Conservation Ecological Science and Technology Demonstration Park of Jiangxi Pro- vince.Comparisons show that the maximum relative error between simulation and experimental data is about 10.98% for total runoff and 15% for total erosion,5.2% for runoffpro- cess and 6.1% for erosion process,indicating that the model is conceptually realistic and reliable and offers a feasible approach for further studies on the soil erosion process.