【摘要】 分析了坡面土壤颗粒的受力情况，认为坡面土壤颗粒的运动与其所受的有效切应力有关，从而推导出坡面土壤侵蚀量计算公式，建立了流域产沙模型。公式的推导具有较强的泥沙运动力学基础，反映了影响流域产沙的主要因素。模型参数少，应用方便，既可计算一次洪水产沙量，又可计算年产沙量。在陕北裴家峁流域上应用，结果令人满意。更多还原

【Abstract】 According to the theory of sediment transport mechanics, it is assumed that the movement of the soil particle on the sloping land depended on the effective shear stress of the flow which is the difference between the shear stress of the flew and the criticle shear stress of the particle on the sloping land. Therefor, a calculation formula of the soil. erosion on sloping land is deduced. And a model of the sediment yield from watershed is developed by using the soil erosion formula obtained. The new model has more physical basis of soil erosion and transport and can be used to predict the sediment yield in a flood period or in a year with less parameter which can be obtained based on the historic data. The model is verified with measured data of the Pei Jiamao catchment in the North Shanxi Province and the results are satisfactory.更多还原