吉林省河流泥沙分布规律分析

Analysis of rivers sediment distribution law in Jilin province

通过吉林省内42处泥沙站实测悬移质泥沙资料,主要包括含沙量、输沙量、输沙模数,经分析计算,绘制输沙模数分区图来探讨省内各流域输沙模数的分布规律,以及与流域其他因素之间的关系。输沙模数与集水面积有一定的关系,得出同一流域随着集水面积的增加输沙模数减小。一般河流上游输沙模数小,中下游大。年输沙量主要取决于降水量的大小和时程分配。降水量大且集中的年份,年输沙量就大,降水量小且分散的年份,年输沙量相对偏小。

The measured suspended sediment data of the sediment station includes the sediment concentration,the sediment discharge and the sediment transport modulus. Through the data analysis and calculation of 42 sediment stations in Jilin province, the partition map of the sediment transport modulus is drawed to discuss the distribution law of the sediment transport modulus for the each river basin in Jilin province and the relationship with other factors in the basin. The result shows that the sediment transport modulus has a certain relationship with the catchment area, the sediment transport modulus decreases with increasing of catchment area. The sediment transport modulus of upper reaches is smaller than middle and lower reaches of the river. Annual sediment discharge mainly depends on the magnitude and temporal distribution of precipitation. Along with the large and concentration annual precipitation, the annual sediment discharge is large, the small and scatter annual precipitation, the annual sediment discharge is small relatively.