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《Marine Science Bulletin》 2005-05
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The Impact Assessment of the West Breakwater Project in Lian-Yun-Gang,Jiangsu Province, China

XU Jun ( The Key Laboratory of Coast & Island Development of Ministry of Education, Nanjing University, Nanjing 210093, Jiangsu, China, )  
The Lianyungang harbor has changed from a strait channel to a semi-closed artificial embayment after the construction of West Breakwater in 1996. Wind wave became weak, and the length of coastline increased greatly, which has improved the condition for the further development of Lianyungang harbor. Furthermore, it advances the transportation between the Lianyungang city and the offshore island named Dongxiliandao, which provides good opportunities for the local tourism to develop the island tour. On the other hand, the dynamic and depositional environment has also been changed after the project. The progressive tidal wave changed into the standing wave in the artificial embayment, which weakened the water exchange. As a result, the water quality inside of the embayment decreased, and the water in the head area was polluted. Meanwhile, the siltation inside of the embayment became aggravated, a new tidal flat has been formed along the inner part of West Breakwater, and the old tourist beach at the head of the embayment can not be used now. Since West Breakwater blocked the west mouth of Lianyun Strait, the moving route of the nearshore sediment has been changed. The sediment coming from northern part flows eastwards along West Breakwater, then turns southeastwards along Dongxiliandao, and finally deposits in the new places, which goes a threat to the tourist beaches along the northern coast of the island. The strengthened siltation processes have also impacted the use of harbor, concerned coastline and hydraulic facilities. Thus, it is important to monitor and study the marine environment in the harbor area and nearby. Further construction along the inner side of West Breakwater should be stopped. Also, in order to solve the siltation problem in the harbor once and for all, west part of the West Breakwater needs to be rebuilt to keep the water exchange.
【Fund】: 国家教育部博士点基金项目20020284005
【CateGory Index】: U656.2;
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