小浪底水库泥沙淤积观测与分析

通过布设174个断面,采用地形法对小浪底水库泥沙淤积形态进行了观测,分析表明:自大坝截流至2005年汛前,库区淤积量为14亿m3,纵向淤积呈明显的三角洲形态,横向表现为平淤,对异重流的形成是有利的。在低水位期与三门峡、万家寨等水库联合进行调水调沙,可以将小浪底水库淤积的部分泥沙冲出库外,因此,营造异重流排沙是减少水库淤积、延长水库寿命的重要手段。

Observation and Analysis on Sedimentation of the Xiaolangdi Reservoir

It observes the sedimentation shape of the Xiaolangdi Reservoir by using topographic method through layout 174 cross sections.The analysis shows that in the period from the dam closure to before the flood season of 2005,the reservoir sedimentation is 1.4 billion m~3,the vertical sedimentation is in a clear form of delta and horizontal is parallel deposition,being advantages for the formation of density current.During low-water level period,it can wash part of deposited sediment out of the reservoir through joint discharge regulation with reservoirs of Sanmenxia and Wanjiazhai.Thus,creating a density current to discharge sediment is an important means for reducing reservoir sedimentation and prolonging lifetime of reservoir.