[Objective] The aim was to study the simulation test of hydrodynamics process of erosion. [Method] Through the runoff scouring experiment , the property of soil erosion in Damaoqi grassland in Inner Mongolia was studied. The process and mechanism of soil erosion were studied. [ Result] The results of runoff scouring experiment on inner Damaoqi steppe showed that the average flow velocity of change slope increased with the discharge of flow and slope gradient. The average silt content rate, the average sediment transport rate and the average sheer stress all increased when the discharge of flow increased, which changed in parabolic form with the increase of slope gradient and the critical gradient is 25°. The relationship between the average sediment transport rate and the average sheer stress is linear. [Conclusion] The study provided theoretic basis for the report of soil erosion in grassland in China.%[目的]研究草地坡面径流侵蚀产沙过程模拟试验.[方法]通过放水冲刷模拟试验对内蒙古自治区达茂旗草原土壤侵蚀特性进行系列分析,研究土壤侵蚀产沙过程和机理.[结果]变坡径流平均流速随径流量和坡度的增大呈波动趋势增加;坡面径流平均输沙率和平均剪切力均随流量的增加波动增加,随坡度的增加而呈抛物线形式变化,临界坡度值出现在25°左右,流量对输沙率的影响大于坡度因素的作用;坡面径流平均输沙率与平均剪切力之间有良好的线性关系.[结论]该研究为建立我国草原区土壤侵蚀预报提供理论依据.
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