南水北调中线工程陕西水源区含沙量变化分析

Analysis on the change of sediment concentration in water source area of the middle-route of the South-to-North Water Diversion Project

目的探讨河流含沙量的变化特征,为减少河流含沙量奠定基础。方法采用文献分析和野外调研相结合的方法。结果汉江和丹江各站的含沙量年内变化很不均匀,以荆紫关为例,在汛期含沙量达到3.0 g.m-3,而在非汛期为0。含沙量与径流量无明显相关性,与输沙量呈直线相关。结论水源区的水土流失严重影响着汉江和丹江的含沙量及河流水质。

Aim To understand and grasp the characteristics of the change in order to lay the foundation for reducing river sediment.Methods Based on literature analysis and field investigation.Results The change of sediment is asymmetry in a year hydrological stations of Han and Dan River,it shows no clear orrelation between sediment and runoff and presents linear orrelation with diment discharge,take example for Jingzignan,the sediment in the flood season was 3 g·m-3,while 0 in the non-flood seasoh.Conclusion Soil erosion in the Shannxi Water Source Area influences seriously the sediment and water quality of Han and Dan River.