黄土地区小流域次暴雨侵蚀产沙研究

通过坡面模拟降雨实验，分析了黄土地区坡面降雨径流产沙过程的主要影响因素，建立了坡面径流含沙量与坡面流量、前期土壤含水量、土壤干容重之间的定量关系。应用实测资料分析了黄土地区暴雨径流侵蚀产沙特点，建立了考虑流域前期土壤含水量和径流涨落段的含沙量与流量之间的水沙传递关系，建立了小流域次暴雨侵蚀产沙模型。经用实测资料计算检验，此模型对小流域次暴雨侵蚀产沙过程及产沙总量的计算结果都具有较高的精度。

Study on Small Watershed Single Storm Erosion Sediment Yield in Loess Region

Based on the simulating rainfall experiments on slopes, the primary factors affecting the process of rainfall runoff sediment yield on slope in the Loess Region is analysed. The quantitative relationships between sediment concentration and discharge, soil unit dry weight and antecedent soil moisture are given. The properties of storm runoff sediment yield in Loess Region are analysed by using the observed hydrological data from watershed. The transference relationships from runoff to sediment concentration are built, considering the effects of various antecedent soil moisture, rising and receding limb of hydrograph. A storm erosion sediment yield model of single rainfall event on watershed is built. Through examining with the observed data,the calculation precision of this model in sediment hydrograph and sediment load is high.