川维厂取水口泥沙淤积研究

Research on Suspended Sediment of Chuanwei Inlet

采用二维水流泥沙数学模型建立贴体正交网格,对川维厂取水口河段在三峡成库后进行不同流量工况下的流场计算,运用一个水文系列年循环计算出成库后该河段的悬移质淤积过程、淤积量、淤积分布.分析计算结果得出:成库后工程河段断面流速减少;取水口位置水势未变,水面依然存在横比降;悬移质主要在两岸的回流区和缓流区成累计性淤积,淤积速率基本一致.着重分析了取水口位置的水流条件变化、淤积后的河演变化对正常取水的影响.

The 2-D sediment mathematical model was adopted to build the sticking body orthogonal mesh. The fluid field of Chuanwei inlet project was calculated in different situation of discharge after the Three Georges Project running. After calculating the sediment silting process, siltation volume and the area of deposition of the project reach in circle way in a series of water year, the conclusion was drawn with the analyses of the calculation result： the velocity in a section near the project is cut down;the water situation near the inlet does not change and the lateral slope still exists; the accumulated suspend sedimentation mostly locates in the recirculation zone and the area of slack water, and the sediment accumulation rate is consistent. The changes of the water condition around the inlet and the influences on the running of inlet by the evolution of river bed are analyzed.