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Effects of Erodibility on Rill Erosion Processes: A Model Study with Finite Element Method

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2007 ASAE Annual Meeting  072051.(doi:10.13031/2013.22934)
Authors:   L J, Yan, T W Lei, Q W Zhang, L Q Qu
Keywords:   Finite element method, simulation, rill erosion, erodibility

The soil erodibility is one of the key parameter in soil erosion, especially in soil erosion prediction and soil erosion process modeling. In order to contrast the different methods for estimated the erodibility and understand the effect of it on rill erosion processes, a physical process based model is developed. Finite element method was used to numerically solve the hydrodynamic and sediment continuity model equations. Model parameters were rationally determined. A series of flume experiments were conducted with a siltey loess soil from the Loess Plateau of China to evaluate the model for better understanding of rill erosion dynamics. The comparison cases involved five slopes (5º, 10º, 15º, 20º, and 25º), three flow rates (2, 4, and 8 L/min) with well-defined rills of 8 m long. Compare the experimentally obtained rill sedimentation processes with simulated results adopting parameters erodibility estimated by different methods to illustrate it influences on rill erosion processes and outlet sediments. The results revealed that the rill erodibility determines the rate at which sediment concentration approaches its allowed value. Beside that the model is proven to be valuable for further development of the dynamic prediction model for the temporal and spatial variations of rill erosion.

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