Soil erosion due to rainfall impact with inflow: an analytical solution with spatial and temporal effects
Soil erosion due to rainfall impact with inflow: an analytical solution with spatial and temporal effects
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DOI：
10.1016/j.jhydrol.2004.03.007
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发表时间：
2004-08
影响因子：
6.4
通讯作者：
W. Hogarth;J. Parlange;C.W Rose;G. Sander;T. Steenhuis;A. Barry
中科院分区：
文献类型：
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作者：
W. Hogarth;J. Parlange;C.W Rose;G. Sander;T. Steenhuis;A. Barry
本文给出了一个基于物理模型的降雨作用下的缓坡土壤侵蚀的近似解析解。近似的解析解和数值解的比较显示出非常好的一致性，除了前几分钟的侵蚀事件。近似解析解应用于从一个说明性的实验，以探索其物理特性的数据。通过使用足够数量的沉积物粒径类，特别是在短时间内预测，充分定义土壤的沉降速度特性的重要性进行了说明。泥沙浓度的时间变化，除了在很短的时间内，被证明是更显着的空间变化的侵蚀面。方程的解允许可视化的速率的沉积物的对流输运的侵蚀表面，这一速率随着沉积物的大小增加，由于更频繁的返回到土壤表面的沉积颗粒。
An approximate analytical solution is obtained for a physically based model of soil erosion on a gentle slope driven by rainfall impact in which there is inflow of clear or nearly clear water to the top of the soil bed. Comparison of the approximate analytical and numerical solutions shows very good agreement, except for the first few minutes of an erosion event. The approximate analytic solution is applied using data from an illustrative experiment to explore its physical features. The importance of adequately defining the soil's settling velocity characteristic through the use of a sufficient number of sediment size classes, especially for prediction at short times, is illustrated. The temporal variation in sediment concentration, except at short times, is shown to be more significant than the spatial variation down the eroding surface. Solution of the equations allows visualization of the rate of convective transport of sediment down the eroding surface, this rate decreasing as sediment size increased due to more frequent return of such particles to the soil surface in deposition.