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针对黄土高原坡面沟缘线上、下侵蚀产沙分异显著的特点,以及机理模型在大中流域不易应用的现状,利用基于Hc-DEM的沟缘线自动提取技术,划分流域沟间地和沟谷地地貌单元.在改进坡长因子算法和改造沟坡侵蚀模型的基础上,提出沟间地运用通用土壤流失方程为模型框架评估面蚀为主的坡地侵蚀,沟谷地运用改造沟坡侵蚀模型评估冲蚀为主的沟谷侵蚀,并与泥沙输移比分布模型集成确定流域侵蚀产沙分布的模型体系.经在北洛河上游流域检验,模型体系能良好模拟流域多年平均侵蚀产沙,在年际尺度也具有较好可靠性,可为黄土高原大中流域水土保持效益评价和水土流失防治规划提供技术支撑.
According to the characteristics of the significant difference between the upper and lower eroded sediments of the loess plateau in the Loess Plateau, and the fact that the mechanism model is not easy to be applied in the mid-large watershed, the automatic extraction technique of the ditch line based on Hc-DEM is used to divide the inter- And gully landform unit.On the basis of improving the slope length factor algorithm and modifying the slope erosion model, it is proposed that the general soil erosion equation is used as the model framework to evaluate the slope erosion, Model was used to evaluate the erosion-dominated gully erosion and integrated with the model of sediment transport ratio distribution model to determine the distribution of soil erosion and sediment yield.According to the test of the upper reaches of the Beiluohe River, the model system can well simulate the sediment yield , And also has good reliability on the interannual scale. It can provide technical support for soil and water conservation benefit evaluation and soil erosion prevention and control planning of the Dazhong River Basin on the Loess Plateau.