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利用MIKE21模型进行浓海水排放对渤海湾海水盐度分布影响的研究,分别以天津大港和河北黄骅两地建设海水淡化工程所排放的浓海水量为输入条件,模拟预测了渤海湾不同潮期和工程规模浓海水排放的扩散状况。结果显示,浓海水的稀释扩散受潮流的影响较大,总体来讲小潮低潮时排海的浓海水稀释扩散效果最差,大潮低潮和小潮高潮时次之,大潮高潮时扩散效果最好;建设10×10~4t/d以下的海水淡化工程浓海水排海对周围海区的盐度影响不显著,建设50×10~4t/d以上的大型海水淡化工程时,小潮低潮时盐度升高波及面积最大,高于背景值1.5 PSU的面积为31 km~2,最远离岸距离为6.74 km,所以大规模海水淡化工程的选址、浓海水排海方式均要进行合理规划、选择,尽可能降低其对海洋环境的不利影响。
Using the MIKE21 model to study the influence of concentrated seawater discharge on the salinity distribution in the Bohai Bay, the seawater desalination projects in Dagang, Tianjin and Huanghua, Hebei Province, respectively, were used as input conditions to simulate and predict the salinity distribution in Bohai Bay at different tide periods The diffusion of engineering-scale concentrated seawater. The results show that the dilute diffusion of concentrated seawater is greatly affected by the tidal current. Generally speaking, the concentrated seawater has the weakest dilution and diffusion effect during the tide of low tide and low tide, followed by the tide of low tide and high tide, The seawater desalination of the seawater desalination project below 10 × 10 ~ 4t / d has no significant effect on the salinity of the surrounding sea areas. When constructing a large seawater desalination project of 50 × 10 ~ 4t / d or above, the salinity increases at low tide The area is the largest, 1.5 PSU above the background value is 31 km ~ 2 and the farthest offshore distance is 6.74 km, so the selection of large-scale seawater desalination project and concentrated seawater discharge should be planned, selected and exhausted May reduce its adverse effects on the marine environment.