黄河中游小流域侵蚀产沙机理研究

本文研究的典型流域指基本上具有单一的下垫面物质组成的流域。本文选取黄河中游河段上的支流；皇甫川、窟野河、无定河上一些小流域作为典型流域进行分析研究。根据下垫面差异，将产沙区分为黄土区、基岩区、风沙区；通过各产沙因子对侵蚀产沙影响作用的分析，对三种产沙区进行定性到定量分析，全面研究了黄河中游产沙机理，并进一步提出了治理对策。

THE MECHANISM OF SEDIMENT YIELD AND HARNESS COUNTERMEASURE FOR LITTLE VALLEYS IN THE MIDDLE REACHES OF THE YELLOW RIVER

Based on the difference of the valley surface of the middle reaches of the Yellow River,the paper fall this study area roughly into three categories:loess area,rock area,wind-sand area.By the analysis of the sediment yield factor of the three areas,three conclusions can be drawn as follow: 1.In the three area,harness degree,rainfall,rain strength,runoff depth all affect the sediment yield in varying degree,and runoff depth is closestly related to sediment yield modulus.There is a negative relation between harness degree and sediment yield modulus. 2.According to the dynamics of sediment yield,runoff depth and rainfall are the major factors affecting sediment yield in loess area and rock area.But in wind-sand area,wind is an important factor that cannot be ignored.The sediment yield occurs basically during flood season in loess area and rock area. 3.It is natural factor and social factor that affect the sediment yield.Thus,a principle synthetical countermeasure should be insisted on.