嘉陵江西汉水流域水保措施减水减沙作用分析

西汉水位于秦岭南坡，其上游分布有2350km^2的黄土区，为嘉陵江流域重点产沙区。自20世纪80年代末“长治”工程实施以来，重点产沙区实施了大规模的水土保持治理，至1996年底，累积治理面积占水土流失总面积的40%，水保措施对控制流域内水土流失起到了积极作用。作者以流域上游控制站顺利峡站为分析重点，以实测水沙资料为依据。采用水文学方法，着重分析积极作用。作者以流域上游控制站顺利峡站为分析重点，以实测水沙资料为依据。采用水文学方法。着重分析研究水保措施实施以来的水沙变化。

Research on Decrease of Water and Sediment Yield Due to Soil & Water Conservation in Jialing River Xihanshui Basin

Xihanshui River is the fourth order tributary of the Jialing River. The river basin locates in the south of Qinling with a loess region of 2 350km 2. It is one of the main sediment sources of Jialing River basin. After the implementation of soil and water conservation in the Changjiang River from the late 1980's, the soil and water losses have been greatly reduced. The total area that has brought under control reached 40 percent of the total soil and water loss area by 1996. This paper tries to analyze the change in runoff, sediment, and their relationship on the basis of measured hydrologic data at Shunlixia station.