黄土高原降雨、径流、产沙相互关系的研究

The Correlation among Rainfall, Runoff and Sediment Generation in the Loess Plateau

文章利用黄土高原巴家嘴等七个流域的年降雨、径流和产沙资料,根据Powell和最小二乘法优化原则,采用多种函数形式模拟降雨和径流、径流和产沙之间的相互关系,并根据残差平方和最小的原则,选择最优的模拟函数。结果表明,黄土高原年降雨和径流之间,年径流和产沙之间都存在着较好的相关关系,并能较好地用线性函数表达,提供了由年降雨量的变化趋势预测年径流和侵蚀产沙变化趋势的一种途径。

According to the data of annual rainfall, runoff and sediment generation of seven watersheds in Bajiazui in the Loess Plateau, using optimization technology of Powell's and least square method, the correlation among rainfall, runoff and sediment generation were simulated by many function types, and elected the optimum simulated function type by least residual square. The results showed that there are better correlations between annual rainfall and runoff, and between annual runoff and sediment yeild in the Loees Plateau. Their relationship may be expressed better with linear function. This paper provided a way to predict annual variation tendency of runoff and sediment yeild by annual rainfall.