温州浅滩围垦工程对周围海域盐度分布和水质的影响

在收集春季瓯江口海域附近的入海污染源位置和污染源源强等数据资料的基础上，主要考虑海水中溶解态无机氮（DIN）、溶解态无机磷（DIP）和叶绿素a的含量，利用MIKE21模型，考虑水体斜压，对温州浅滩围垦工程前后周围海域水环境的水动力和水质进行了耦合数值模拟。研究结果表明：工程并不会大范围改变瓯江口海域的水动力特征，影响主要集中在河口附近，体现在北口区域的流速有所增加、南口区域近河口处流速有所减小；同时，围垦工程导致北口潮流加大、盐度值略有增加；工程实施后不会对周围海域水质造成大范围改变，但是对局部海域水质的确有一定的影响，近河口处海域的营养盐浓度和叶绿素a含量都呈现上升趋势，局部区域富营养化一定程度上有所加重。

Influence of Wenzhou shoal land-making project on salt distribution and seawater quality nearby

Based on the collection data of position and concentration of pollution sources in spring,mainly considering the concentration level of DIN,DIP and chlorophyll-a,the current and water quality coupling numberical simulation was carried out.Taking into account baroclinic water,MIKE21 model was used before and after the Land-making Project in the Oujiang Estuary.The result shows that the project would not cause great changes to the hydrodynamic characteristics in Wenzhou Bay,but it would increase the current speed in the north area and decrease the current speed in the south area near the estuary.The salt distribution in the north area changes obviously while the amount of salinity increases near the north part of the estuary.Generally,Phrase I and Phrase II projects would not cause large scale changes to the seawater quality around,but it does have a certain effect on the local seawater quality.Nutrients and chlorophyll-a near the mouth of the estuary showed a rising trend and the eutrophication was aggravated.