三峡蓄水初期坝下沙卵石河段航道条件分析  

Analysis of navigation conditions in gravel bed reach at initial impounding stage of Three Gorges reservoir

作　　者：陈飞 付中敏 刘怀汉 刘奇峰 

机构地区：[1]长江航道规划设计研究院,武汉430011

出　　处：《水力发电学报》2012年第5期127-132,共6页Journal of Hydroelectric Engineering

基　　金：西部交通建设科技项目(2007-328-000-90)

摘　　要：三峡水库蓄水运用后,进入下游河道的水沙条件发生了重大变化,使坝下游河道的水流条件、冲淤特性及演变规律发生变化,给航道条件带来影响。本文研究基于原型观测获取的大量实测资料,揭示了三峡水库蓄水初期坝下沙卵石河段内航道问题主要体现为:沙卵石河段内沙质淤沙浅滩航道水深有所提高;局部河段向宽浅方向发展,航道水深减小;随着水位下降,沙卵石局部浅滩河段将出现水深不足问题;芦家河局部卵石滩段的"坡陡流急"问题依然存在。After impoundment of the Three Gorges reservoir, the incoming water and sediment conditions of its downstream river reach have been changed, and consequently changes have occurred in local flow conditions, erosion and deposition features, and riverbed evolution. All these changes together produce a significant impact on navigation conditions there. Analysis of in-situ measurements show that some navigational problems have emerged. First, in overall the depths of navigable channels have been increased, improving the navigations of the entire reach. Second, the channels in certain local reaches tend to be wider and shallower, causing a decreasing navigation depth. Third, with water level dropping, new gravel shoals of too small depths have emerged, becoming inadequate for navigation. Last, the difficulty of rapid currents and large gradient at the Lujiahe gravel shoal remains as before.

关 键 词：河流动力学 航道 原型观测 沙卵石河段 

分 类 号：TV147[水利工程—水力学及河流动力学]