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| Influences of artificial island on water exchange of Jinmeng Bay |
| KUANG Cui-ping1, YU Lu-lu1, GU Jie2, DONG Zhi-chao1, SONG Hong-lin1, ZHU Lei3 |
1. College of Civil Engineering, Tongji University, Shanghai 200092, China;
2. College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China;
3. The Eighth Geological Brigade, Hebei Geological Prospecting Bureau, Qinhuangdao 066001, China |
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Abstract 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.
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Received: 15 July 2018
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