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以黄土高原典型流域中重力侵蚀产沙量为研究对象,选择岔巴沟流域中6个淤地坝小流域作为研究流域,以坝库中1978—2001年共22年泥沙淤积量作为流域总泥沙侵蚀量,采用中国土壤侵蚀流失模型(CSLE)并考虑沟蚀因素计算水力侵蚀量,将水力与重力侵蚀产沙量区分开来。研究结果表明:6个小流域中重力侵蚀产沙分别占流域总侵蚀产沙量的0%、51.0%、54.1%、59.0%、65.0%和67.0%;小流域中重力侵蚀产沙量与>32°的沟坡面积具有显著的线性正相关关系,沟坡坡度是重力侵蚀的控制性因素,降低沟坡坡度能够显著地减少流域产沙量。
Taking the gravity erosion and sediment yield in the typical watershed of the Loess Plateau as the research object, six small silt dams in the Chabagou drainage basin were chosen as the research basins. Taking the sediment deposition in the dams in a total of 22 years from 1978 to 2001 as the total catchment area The amount of sediment erosion, the use of China Soil Erosion Loss Model (CSLE) and considering the gully erosion factor to calculate the amount of hydraulic erosion, the hydraulic and gravity erosion and sediment yield distinction. The results showed that the gravity erosion and sediment yield of the six small watersheds accounted for 0%, 51.0%, 54.1%, 59.0%, 65.0% and 67.0% of the total erosion and sediment yield in the watershed respectively. The slope area of 32 ° has a significant linear positive correlation. The slope of slope is the controlling factor of gravity erosion. Reducing slope slope can significantly reduce sediment yield.