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径流剪切力是建立土壤侵蚀过程模型重要的水动力学参数,研究径流剪切力和土壤侵蚀产沙相关关系具有重要理论和实践意义。以径流冲刷模拟试验为研究手段,研究不同流量和不同坡度组合条件下坡面侵蚀过程中径流剪切力的分布特征,并对应分析土壤剥蚀率与各阶段径流临界剪切力的相关关系。结果表明:不同试验条件下,坡面侵蚀发育各阶段径流剪切力和土壤剥蚀率随冲刷流量的增加而增加,随小区坡度的变化受临界坡度影响;土壤剥蚀率与放水流量、坡度和径流剪切力等多因子呈线性相关,与流量或坡度的大小呈正比,与径流剪切力的大小呈反比;土壤剥蚀率与各径流剪切力单因子呈幂函数或指数函数相关,随径流剪切力的增加呈增加趋势;坡面产生跌坎时的临界剪切力和坡面径流平均剪切力均可以作为土壤侵蚀预测参数。
Runoff shearing force is an important hydrodynamic parameter for establishing soil erosion process model. It has important theoretical and practical significance to study the relationship between runoff shear force and soil erosion and sediment yield. Taking the runoff scouring simulation test as a research method, the distribution characteristics of runoff shear force during slope erosion under different flow rates and different slope combinations were studied. The correlation between soil erosion rate and critical shear stress at each stage was analyzed. The results show that under different experimental conditions, the runoff shear force and soil erosion rate increase with the increase of flushing flow rate at each stage of slope erosion development. The slope gradient changes with the slope gradient. The soil erosion rate, discharge flow rate, slope and runoff Shear stress and other factors are linearly related to the size of the flow rate or slope is proportional to the size of the runoff shear force is inversely proportional to the rate of soil erosion and Runoff Shear force single factor power function or exponential function related to runoff The increase of shear force tends to increase. The critical shearing force and the average shearing force of slope runoff on the slope can be used as the soil erosion prediction parameters.