在水土流失研究中，坡面径流流速是径流计算、土壤侵蚀预报中不可缺少的水动力参数。
In the research of the soil erosion, the rate of slope runoff is an indispensable hydrodynamic parameter in the runoff computation and the soil erosion forecast.
安山小流域属低山丘陵中度侵蚀区，水土流失严重。
Anshan basin is low mountains middle erode area, the soil eroded very serious.
水土流失，其实是一种主要的侵蚀地貌演化过程。
Water and soil loss is an important physiognomy evolution course.
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