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A simulation model for unified interrill erosion and rill erosion on hillslopes

✍ Scribed by Q. Q. Liu; H. Xiang; V. P. Singh

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
190 KB
Volume
20
Category
Article
ISSN
0885-6087

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✦ Synopsis

Abstract

A mathematical model was developed for simulating runoff generation and soil erosion on hillslopes. The model is comprised of three modules: one for overland flow, one for soil infiltration, and one for soil erosion including rill erosion and interrill erosion. Rainfall and slope characteristics affecting soil erosion on hillslopes were analysed. The model results show that the slope length and gradient, time distribution rainfall, and distribution of rills have varying influence on soil erosion. Erosion rate increases nonlinearly with increase in the slope length; a long slope length leads to more serious erosion. The effect of the slope gradient on soil erosion can be both positive and negative. Thus, there exists a critical slope gradient for soil erosion, which is about 45Β° for the rate of erosion at the end of the slope and about 25Β° for the accumulated erosion. Copyright Β© 2005 John Wiley & Sons, Ltd.

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