晋江海域海水淡化排海盐度场三维数值模拟

3D-numerical simulation on distribution of brine discharge from seawater desalination plant in the sea area near Jinjiang

本文运用MIKE3数值模拟软件,建立了晋江海域海水淡化排海三维温、盐扩散模型,模拟了不同潮期、潮时盐度的水平和垂直方向扩散情况。结果表明,浓海水排海后盐度分布受水位和流速的影响,水位越高、流速越大,稀释和扩散作用越明显,在垂向上的扩散距离越小。规模20万t/d海水淡化工程浓海水排放对附近海域盐升的水平影响在几百米范围内,垂向影响在3m以内,且随着水位和流速的增加在水平和垂向上能够较快稀释扩散,在附近不存在环境敏感区的情况下,不会对海洋环境造成显著影响。

A 3 Dtemperature-salt numerical model of the sea area near Jinjiang was established,based on MIKE3,horizontal and vertical diffusion in different tide was simulated.The results show that brine distribution is affected by water level and current velocity,the higher the water level and velocity,the greater the effect of dilution and diffusion,and the smaller the vertical diffusion.The brine discharge from 200 000 t/d seawater desalination plant,the range of salt-rise is about hundreds of meters in horizontal and about 3 min vertical.With the increasing of water level and current velocity,the salt-rise is spreading quickly.If there is no sensitive area nearby,it will not have a significant impact on the marine environment.