新疆克孜尔水库堤渠联合辅助排沙系统异重流排沙效果分析

Density current sediment flushing effect analysis for dike-canal joint desilting system of Kezier Reservoir in Xinjiang

针对克孜尔水库泥沙淤积问题,提出了堤渠联合辅助排沙系统。系统实施后达到了干支流路径分离的目的,改善了水流环境,增强水流挟沙能力,缩短支流黑孜河的泥沙运行路径,从而使得支流高含沙水流形成的异重流更易于到达坝前。从人工辅助系统实施前2007年及系统实施后2011年黑孜河异重流的输沙数据对比分析的结果表明:系统实施后缩短了挟沙水流运行距离和库区传播时间缩短,增大了出库沙量,减少了水库泥沙淤积,延长水库寿命,效果显著。

In view of the sedimentation problem of Kezier Reservoir in Xinjiang Uygur Autonomous Region, thedike-canal joint desilting system was put forward. After the system was constructed, trunk streams and tributariesare separated; flow environment is improved; silt-carrying capability of water flow is strengthened; silt route ofHeizi tributary is shortened, so it becomes easier for the density current in tributary with high silt content to reachthe main dam. The sediment discharge data of 2007 and 2011, respectively before and after the construction ofdike-canal joint desilting system, had been compared and the results demonstrate that after the construction,thetravel distance and time of silt-carrying flow in reservoir area are shortened;sediment discharge from the reservoirincreases;sedimentation in reservoir decreases;and the service life of reservoir is prolonged with significant bene-fits.