南汇东滩及浦东国际机场外沿围海造地工程潮流数学模型研究

Tidal current simulation model for shoal reclamation at eastern tidal flat of Nanhui and east side of Pudong International Airport

通过建立长江口、杭州湾大范围平面二维潮流数学模型,综合考虑长江口、杭州湾两大潮波系统,探讨南汇东滩及浦东国际机场外沿圈围工程对附近各关心水域的水动力条件的影响范围及程度。研究结果表明:南汇东滩及浦东国际机场外沿圈围工程后,长江口侧的涨、落潮潮量略有减小,而杭州湾则略有增大。相应的,工程附近海域的潮流流速和潮差也受到工程不同程度的影响。就流速变化而言,涨潮时,南槽主槽流速略有下降,北槽则略有增加,落潮时,南槽主槽流速主要呈现略有增加的趋势,而北槽则基本不变;在杭州湾侧海域,涨、落潮水流流速均略有增加。而潮差方面,在长江口一侧,高桥处潮差略有减小,且呈现出越接近工程区,潮差变率越大的趋势;而在杭州湾一侧水域,潮差整体呈略有增加趋势,但是变率基本都在1%以内。

By establishment of a 2 - D plane tidal current numerical model for Yangtze Estuary and Hangzhou Bay, the two tidal systems of Yangtze Estuary and Hangzhou Bay were taken into account, and the hydrodynamic variation of the area nearby was discussed. The comparison shows that the tidal prism of Yangtze Estuary will be decreased after reclamation. On the contrary, the tidal prism of Hangzhou Bay will be increased. Thus, the current speed and tidal range of Yangtze Estuary and Hangzhou Bay will be influenced at a certain content. As far as velocity of tidal flow, in spring flood, the tidal velocity of South Passage will be decreased a little, and that of North Passage will be increased slightly. In spring ebb, the current velocity of South Passage will be increased a bit, and that of North Passage won＇ t be changed nearly. However, the current velocity of Hangzhou Bay will be increased slightly. Concerning tidal range, it will be decreased by a certain degree at Yangtze Estuary, and the degree is linear to the distance to project area. Whereas, the tidal range at Hangzhou Bay will be increased, and the change extent is mostly less than one percent.