黄土高原暴雨径流及产沙的分析与模拟

Analysis and Simulation of Storm, Runoff and Sediment on the Loess Plateau

黄土高原暴雨存在时空分布不均匀性,采用雨量分布曲线的方法,计算随流域面积增大暴雨面雨量的减小,对流域划分单元进行产流与汇流模拟计算,是中等流域暴雨洪水计算的可行途径。分析表明,径流量与产沙输沙量具有良好的相关关系,可以用简单的指数方程或线性关系表示,输沙过程可以通过流量过程的对应关系进行定量计算。

The precipitation is very non-uniform in temporal and spatial distribution on the Loess Plateau. For calculating the decrease of area mean rainfall by the increase area was adopted rainfall distribution curve, to divided the watershed into elementary area, the both are accessible for simulation of rainfall—runoff on medium scale watershedo. Showed by analysis, there are good relationship between runoff and sediment. It can be expressed by exponential equation or linear relation. The sediment delivery process can be calculated by the corresponding relation between discharge and sediment process.