葛洲坝水库冲淤规律及航道变化

根据葛洲坝水库近20a水文泥沙观测成果，分析了库区水力条件的变化，阐述了水库泥沙淤积的动态特征与基本规律，浅滩演变与航道变化。葛洲坝枢纽运用一期，库区淤积即基本平衡，经过多年冲淤冲淤调整与交换，水库平衡淤积量约1．5亿m^2，库区淤积主要在常年回水区的宽谷段，其淤积末端距坝120km处，库尾河道及浅滩仍保持蓄水前的演变形势，库区险滩水流条件及航道均得到不同程度的改善。

Scouring-sedimentation law and navigation channel change of Gezhouba reservoir

According to the sediment measuring data in Gezhouba reservoir in recent 20 years,this paper analyses the changes of hydraulic condition in the reservoir area, describes the dynamic characteristics and basic law of reservoir sediment deposition as well as the evolution of shallow beach and navigation channel.After 5 years operation since the Stage I works was completed in 1981, the scouring-sedimentation balance in the reservoir area was fundmentally reached, after several years of regulation of scour and sediment, the balanced sediment volume in the reservoir is 105 million m\+3. The sediment deposition in the reservoir area mainly occurs in the wide river valley stretch of perennial backwater zone and the uppermost sediment location is 120 km from the dam. The tail river channel of the reservoir and shallow beach maintains the same evolution trend as before impoundment.The critical flow condition of the rapids and navigation channel in the reservoir area are all improved in varying degrees.