摘要
本文以渤海湾为例,运用MIKE3 FM数值模拟软件建立了渤海湾天津附近海域海水淡化浓海水与电厂温排水混合排放温盐扩散三维数值模型,开展了浓海水和温排水不同混合比例温盐扩散对比研究。研究结果表明:浓海水与温排水混合排放可以使受纳海域盐升范围显著减小,并且混合比例越高,效果越明显。在温升影响方面,与等量温排水单独排放相比,混合排放会使底层海域温升包络面积增大,表层减小,但当混合比例超过1∶30 (温排水量约为35 m^(3)/s)时,表层和底层海域温升包络面积接近于等量温排水单独排放的温升包络面积;综合考虑温盐扩散,当海水淡化浓海水排放量在10×10^(4)m^(3)/d,盐升不超过20时,与温排水混合排放比例超过1∶30 (温排水量超过35 m^(3)/s),盐度在排放口附近可稀释到背景值,由于混合排放密度变化引起的温度下沉影响几乎可以忽略不计。相关研究结论可为海水淡化浓海水科学排放,推动海水淡化和海洋环境和谐可持续发展提供技术支撑。
Taking the Bohai Bay as an example,using MIKE3 FM numerical simulation software,a three-dimensional numerical model of temperature and salinity diffusion in the mixed discharge of concentrated seawater from seawater desalination and thermal-discharge from power plants to the sea near Tianjin Port in the Bohai Bay was established,comparative study on the diffusion of temperature and salinity with different mixing ratios of concentrated seawater and thermal-discharge.The result show that the mixed discharge of concentrated seawater and thermal-discharge can significantly reduce the range of salinity rise area in the receiving sea,and the higher the mixing ratio,the more obvious the effect.In terms of temperature rise,compared with the same amount of thermal-discharge separately,mixed discharge will increase the envelope area of temperature rise in the bottom sea area and reduce the surface area,but when the mixing ratio exceeds 1:30(the thermal-discharge displacement is approximately 35 m^(3)/s),the temperature rise envelope area of the surface and bottom sea areas is close to the temperature rise envelope area of the same amount of thermal-discharge separately;comprehensive consideration of temperature and salinity diffusion,when the discharge of concentrated seawater from seawater desalination is 10×10^(4)m^(3)/d,and the salinity rise does not exceed 20,the mixed discharge ratio with thermal-discharge exceeding 1:30(the thermal-discharge displacement exceeds 35 m^(3)/s),the salinity can be diluted to the background value near the outfall,and the temperature drop caused by changes in mixed density can be almost negligible.The relevant research conclusions can provide technical support for the scientific discharge of concentrated seawater from seawater desalination,promoting the harmonious and sustainable development of seawater desalination and marine environment.
作者
陈爱慧
张拂坤
刘淑静
CHEN Aihui;ZHANG Fukun;LIU Shujing(The Institute of Seawater Desalination and Multipurpose Utilization,Ministry of Natural Resources,Tianjin 300192,China)
出处
《海洋技术学报》
2024年第1期109-120,共12页
Journal of Ocean Technology
基金
中央级公益性科研院所基本科研业务费专项资金资助项目(K-JBYWF-2022-QR-04,K-JBYWF-2021-ZD01)。
关键词
海水淡化
浓海水
温排水
混合排放
seawater desalination
concentrated seawater
thermal-discharge
mixed discharge