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２０世纪末,坡面降雨水土流失的研究日益深入。经验性模型是根据实际资料应用统计相关的方法建立起来的,其结构简单,使用方便。物理过程模拟模型试图对流域内发生的侵蚀产沙过程进行概化和近似,并用数学方程描述流域上侵蚀产沙的主要物理过程,再用比较严格的数值解法计算水沙运动过程。同时人们对侵蚀机理的研究也得到了深入发展。
At the end of 20th century, the research on rainfall and soil erosion on sloping land has been deepening day by day. The empirical model is based on the application of statistical data related to the actual data set up, its structure is simple, easy to use. The physical process simulation model attempts to generalize and approximate the process of erosion and sediment yield occurring in the basin. Mathematical equations are used to describe the main physical processes of erosion and sediment yield in the basin, and the more rigorous numerical methods are used to calculate the process of sediment movement. At the same time, people’s research on erosion mechanism has also been further developed.