洋山港海域潮动力特征及其对工程的响应

距上海陆域外约32 km的洋山港是以小洋山岛链为基础建造的中国首个离岸式深水港口, 其港区陆域是通过封堵北岛链三个主要汊道并抛填成陆而成。大规模的封堵陆连工程改变了该海域的地形边界条件, 海域潮动力特征也随之响应。通过对洋山港海域堵汊陆连工程前后潮位及潮流实测资料的分析研究, 发现洋山港海域的潮动力特征主要表现在:海域潮波倍潮及复合潮增幅随工程的进行而增大, 潮动力表现出明显的非线性特征;海域中部发生壅水;海域潮波向驻波性质变异并于憩流时段引发环状流场。

Tidal Dynamics of Yangshan Harbor Sea Area and Its Response to the Project

As the first offshore-port in China,the Yangshan Deep Water Port was set up along the Xiaoyangshan island chain,locating about 32 km away from the mainland of Shanghai.The port is shaped by three main fork channel closures and throw-filling land-making projects.The topography of this area was changed strongly by the large-scale man-made landform projects,which led to the response of tidal dynamics of Yangshan Harbor sea area.According to the observation data of tidal level and tidal flow before and after the project,we found the main tidal dynamics in Yangshan Harbor sea area are as follows.The amplitude of over-tide and compound tide are strengthened due to the project,showing a distinct non-linear effect.Backwater phenomena occurs in the central part of this sea area.The tidal wave shows that standing waves near the landline area cause a weak tidal circulation in the slack tidal period.