三峡蓄水初期宜昌枯水位稳定机理分析

Analysis of Stability Mechanism of Yichang Low-water Level During TGP's Initial Impoundment Period

宜昌枯水位是影响葛洲坝船闸运行的重要参数。三峡蓄水初期,葛洲坝下游河床发生较大强度的冲刷,但宜昌枯水位未发生明显下降现象,其原因尚不十分清晰。通过分析三峡蓄水初期葛洲坝下游河床边界的变化认为,河床平面形态稳定、纵剖面形态的卡口作用、冲刷分布不均及河床阻力有所增加等是宜昌枯水位维持稳定的原因,其中在纵剖面形态的卡口作用影响下,未来宜昌枯水位发生大幅下降的可能性不大。

Yichang low-water level is an important parameter connected with the operation of Gezhouba ship lock.It has been keeping stable while a huge amount of sediment erosion has been caused during TGP s(Three Gorges Project) initial impoundment period,and the reason is not very clear now.Analysis of the riverbed boundary condition changes is presented in this paper,and it showed that the stable plan-metric figure,function of the bottle-neck reach,non-uniformity of the bed erosion,increase of the bed resistance ar...