码头桩群对八卦洲汊道分流比的影响研究*

长江南京八卦洲是典型的鹅头型分汊河道,左汊为支汊,右汊为主汊。近年来,由于洲头冲淤及河流岸线开发利用程度提高等影响,河岸码头兴建数量增大,左汊分流比不断减小,其分流比的减小与码头桩群的阻力影响密切相关。本文利用平面二维水流数学模型计算研究了码头桩群对分流比的累积影响,结果表明:随着码头的不断兴建,汊道的水流阻力增大,左汊分流比减小明显。

Influence of pile group on division ratio of Baguazhou branch

The branch of Baguazhou is a typical goose-head shape branch river,with the branch on the left and the main on the right.Main branch is in right.Recently,due to the scouring and siltation at the bar head and increasing development and utilization of the river bank,wharves along the river increas and the division ration of the left branch reduces gradually,which is closely related to the impact from the resistance by the wharfs’pile groups.This paper studies the accumulative influence of wharf′s pile group on the division ration by a 2-D flow mathematic model.The result reveals that with the building up of wharves,the flow resistance increases and the division ratio of the left branch decreases remarkably.