关键词: 二滩水库, 泥沙淤积, 断面测量, 特征分析

Abstract: Based on the measured hydrology and cross-sectional sedimentation data since operation of Ertan Reservoir, the deposition characteristics are analyzed. The results show that: Ertan reservoir had about 625 million m³ of sediment deposition from 1998 to 2011, most of which was below the dead storage, and the loss of regulating capacity rate was 6.18%. During 1998 to 2000, the annual deposition was about 76 million m³, and during 2000 to 2011 the average annual amount of siltation was approximately 36 million m³. The reservoir sedimentation, shaped in delta, gradually advances towards the dam. From the longitudinal distribution, the sediment deposition in main stream is mainly in the middle part of reservoir. From the horizontal distribution, the deposition is mainly in the main channel. The distance from delta siltation to dam is measured about 66.0 km, and the average elevation of siltation in front of the dam is 1 030.0 m, below the bottom elevation of spillway buildings and intakes. The dam siltation problem would not occur.

Key words: Ertan reservoir, sedimentation, section measurement, characteristics analysis