通州湾滩槽地形下围堤工程对潮流条件的影响

通州湾海区地形复杂,滩槽相间,形成涨潮漫滩和落潮归槽的潮流特征;同时又是粉砂质海床,泥沙易起动易落淤。潮流是该海区的主要动力,维持着该海区的滩槽格局。针对滩槽地形下复杂的潮流条件,以通州湾港区二港池匡围一期工程为例,利用MIKE21-HD二维潮流数值模型模拟分析不同东围堤特征工况下的潮流条件,推荐渡汛前的东围堤暂建长度,以控制堤脚位置的潮流流速。

Influence of sea dike project on tidal current condition in channel-and-shoal topography in Tongzhou Bay

The topography of Tongzhou Bay area is complicated,which is comprised of shoal-channel spaced in between.The current flows through the shoal at high tide and back to channel at low tide.Meanwhile,the seabed in Tongzhou Bay is powder sand,which is easy to both deposite and resuspend.Tidal current is the main dynamic in this sea area,which maintains the beach pattern of the sea area.According to the complex tidal current conditions in the beach,and taking First Phase of Harbor Basin No.2 reclamation of Tongzhouwan Harbor as an example,the tidal current conditions under different characteristics of different east embankments are simulated by using the mike21-Hd two-dimensional flow numerical model.This paper recommends the temporary construction length of the east embankment before flood to control the tidal current velocity at the dike toe.