葛洲坝枢纽大江下游航道近期冲淤特性初探

Preliminary Investigation on the Erosional and Depositional Behavior of Dajiang Waterway at Downstream Water of Gezhouba Hydroelectric Power Staion in the Near Future

葛洲坝大江航道处于粗沙集中输移和泥沙大量淤积范围,除向家咀外,初期运用防淤堤减淤和汛末汛后冲沙等措施,航道内泥沙可基本解决;但下游航道(长约4.5km)泥沙淤积引起航道水深不足的问题受到关注。本文结合原型观测资料,对下游航道近期首次过流冲沙及试航以来的冲淤特性作一初步分析。

Dajiang waterway nearby Gezhouba hydroelectric station is situated in the section where transport .of coarse sand was often concentrated and large amount of silt deposited there. At the first stage, building some anti-siltation dykes along the river, except the reach at Xiangjiazui, to alleviate the siltation and utilizing the floodwater to scour the deposits, the situation of siltation has been improved basically. But, owing to the siltation of the downstream channel, with a length of about 4.5km, this waterway may lead to the deficiency of navigational water depth, for which we must pay attention to. Based on the prototype observation data,this paper makes a preliminary analysis on the ero , sional and depositional behavior of this downstream channel for the near future.