黄土地区一次暴雨产沙数学模型的研究

The Study on Mathematical Model for Sediment Yields Caused by One Storm in Loess Zone

本文在大量实测资料的基础上,采用成因分析方法建立了黄土地区小流域一次暴雨径流深、产沙量及泥沙输移比公式。为了计算大流域的产沙,将大流域分割成若干小流域,由河道将小流域相联,这样小流域的产沙计算和已有的河道冲淤计算的数学模型相联,从而形成一套较为完整的由降雨预报流域产沙的数学模型,并使模型程序化。通过率定验证取得了较为满意的结果,并在较大流域(十里河流域面积1185平方公里)上进行了计算。

Based on a large amount of field data of erosion and sediment yield in loess zone with different natural and social circumstances, the runoff in depth, the sediment yields and the sediment delivery ratio equations in a small watershed for one storm were derived. A large basin can be divided into a series of small watersheds linked by rivers. With the equations in small watersheds and existing mathematical river model, a mathematical model for prediction of sediment yield in the large basin for one storm has been established. The calibration of its resaults of the model are satisfactory.