长江口北槽潮波传播变化特征研究

Variation Characteristics of Tidal Wave Propagation in the North Channel of Yangtze Estuary

长江口深水航道治理工程实施后,北槽河势发生了巨大变化,北槽河床形态、水深的变化必将影响长江口潮波传播。为研究长江口潮波传播的变化,利用非结构网格FVM方法建立了大通至外海的大范围数学模型,研究长江口深水航道治理工程各分期工程对潮波传播的影响。研究表明:长江口深水航道治理一期工程因工程量相对较小,工程实施后,北槽潮波变化相对较小;二期工程后北槽潮波能量损失较大,高潮位略有抬升,低潮位大幅度抬升;三期工程后,潮波变化与二期工程基本一致。北槽导堤工程引起的潮波能量损失较小,丁坝工程致使潮波能量损失较大。

The regime in the north channel of Yangtze river estuary has changed remarkably after the implementation of deepwater channel regulation projects. Variations in the riverbed morphology and water depth will affect the tidal wave propagation. In view of this,a mathematical model of Datong-offshore was built through unstructured grid FVM to research the impacts of deepwater channel regulation projects at Yangtze river estuary on the tidal propagation. Results show that tidal wave propagation in the north channel changed little after the first phase of the project due to small engineering quantities. But after the second phase,the high tide level rose slightly while low tide level rose remarkably. The tidal wave propagation kept consistent after the third phase. The loss of tidal wave energy is caused slightly by jetties but mainly by groin works.