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中文摘要：
目的确定南水北调中线陕西水源区的水土流失状况,为水土流失的治理提供理论依据。方法统计分析武侯镇、安康、白河以及麻街、丹凤、荆紫关1985—2006年的水沙资料。结果汉江的主要输沙区为安康—白河区段,年均输沙量为705万t,而丹江的主要输沙区为丹凤—荆紫关,年均输沙量为157万t。汉、丹江的汛期输沙量主要集中在7-9月。结论输沙量沿程增大,且随径流量的变化而变化;输沙量较径流量的年内分配集中,年际呈现不规则的周期变化。
英文摘要：
Aim To understand the status of soil erosion and offers theoretic gist for controlling soil erosion in Shannxi water source area of middle route of South-to-North Water Diversion Project.Methods Counting and analyzing the runoff and sediment data which was measured in hydrological stations of Wuhouzhen,Ankang,Baihe,Majie,Danfeng,and Jingziguan in 1985—2006.Results The major sediment zone of the Hanjiang was Ankang to Baihequ,and the average annual sediment load was 7.05llion T,while the Danjiang was Danfeng to Jingziguan,the average annual sediment load was 1.57 million T.Sediment discharge in flood season of Hanjiang and Danjiang mainly concentrated in the July-September.Conclusion The sediment discharge augments on way and varies with the changes of runoff.The character discharge is better concentratively distributed in a year than runoff,it presents irregular periodic variation yearly.
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