三峡水库蓄水后关洲水道河床演变特征及航道条件变化

三峡水库蓄水运用后,下游河段发生河流再造床过程,河床进行冲淤调整。基于关洲水道三峡蓄水后2003—2013年原型观测资料,分析蓄水后该水道河床的冲淤变化情况。结果表明:该水道在三峡蓄水后总体处于冲刷态势,尤以左汊冲刷明显,这对该水道两汊分流产生较大影响,进而影响主航道条件,同时进一步恶化下游芦家河水道进口航道条件。在此基础上,对本水道航道条件变化趋势进行预测,认为目前比较优良的航道条件在自然作用下存在恶化的可能,为本水道航道治理思路的形成和工程设计提供参考。

Characteristics of riverbed evolution and change of waterway conditions about Guanzhou waterway after water impoundment of the Three Gorges

Since the impoundment of the Three Gorges reservoir,water and sediment to the downstream reach has changed,resulting in the process of river transformation on the Changjiang-Guanzhou river and erosion of the bed.Based on the latest prototype observation data of the reach after construction of the Gorges project,we know that the waterway after the Three Gorges reservoir is generally in the scour situation,especially the left branch.This situation exerts a great influence on the waterway shunt of the two branches,and thus further affects the main waterway conditions,and meanwhile influences the entrance channel conditions of the waterway downstream Lujiahe.Based on the above analysis,we predict the waterway variation trend,and think that the currently favorable waterway condition may change worse under the action of natural deterioration.The research result may serve as reference for the determination of the regulation indea and engineering design of this waterway.