人工岛对金梦海湾水体交换的影响

为研究金梦海湾人工岛的不同布局对周围海域水动力及水体交换的影响，基于MIKE软件建立三维和二维潮流模型以及保守物质输运模型，运用欧拉法计算水体滞留时间，从整体和分区二个方面分析人工岛对水体交换的影响机制.结果表明：海螺岛工程起到分流、导流的作用，提升了金梦海湾的水体交换能力，水体交换率提升10.17%；海螺岛和进岛路的联合作用，使金梦海湾形成一个水体交换能力较差的半封闭式水域，水体交换率下降7.73%；在建设人工岛时保留潮汐通道有助于该区域的水体交换，进岛路的去除为汤河口和金梦海湾近岸增加一条潮汐通道，水体交换能力增加17.90%；在弱潮流地区，需考虑余流的作用.金梦海湾区域的余流小，潮流弱，因此保守物质滞留时间长，水体交换缓慢，水体的自净能力低.

Influences of artificial island on water exchange of Jinmeng Bay

To study the influences of the different layouts of artificial island on the hydrodynamic and water exchange in the Jinmeng Bay, based on MIKE software, a three and a two-dimensional hydrodynamic and conservative substance transport model were established, and Euler method was used to calculate the residence time. The influence mechanism of artificial island on water exchange was analysed from the entire region and several sub-regions. It reveals that:Conch Island played the roles of guiding and diversion flow, which improves the water exchange capacity of the Jinmeng Bay, i.e., water exchange rate increased by 10.17%. The combined Conch island and connection road make the Jinmeng Bay form a semi-enclosed water area with a poor water exchange capacity, i.e., water exchange rate decreased by 7.73%. The retention of tidal channel in the construction of artificial island is conducive to the water exchange in the region, and the removal of the connection road adds a tidal channel to the near shore of the Tanghe river and the Jinmeng Bay, the water exchange capacity increased by 17.90%. In weak tidal areas, the effect of residual flow should be considered. The residual current and tidal current in the Jinmeng Bay are very weak, the conservative substance can be kept for a long time. Hence, the water exchange is weak and the self-purification capacity is low.