渤海湾沿岸电厂高温水排放分布特征研究

Research on Distribution Characteristics of Heated Water Discharged from Power Plants along Bohai Bay

渤海湾沿岸围绕着天津大港、河北黄骅港和曹妃甸工业区,在渤海湾主要临港工业区均建有大型电厂。临海电厂抽取海水进行循环降温,致使水温升高,最终将高温水排入临近海域。高温水排入渤海湾之后,在涨潮落潮作用下将逐渐向外海及沿水深方向扩散。文中采用Mike 21/3三维耦合模型,对高温水排海后的扩散特征进行模拟,通过计算发现:高温水排海后温度沿水深方向逐渐降低;排海高温水逐渐向外海扩散,同时温度由近岸向外海逐渐降低,由于受到往复潮流的作用,高温水整体扩散范围有限。

Bohai Bay is surrounded by Dagang Port in Tianjin,Huanghua Port and Caofeidian Industrial Zone in Hebei province,and large-size power plants are built in main port port-neighboring industrial zones.In general,seawater is used for cooling down the power plants’equipment in cycling mode,which produces hot water.Finally the heated water is discharged into adjacent sea area,and gradually diffuses to open sea and deep sea under the action of flood and ebb tides.Now Mike 21/33D coupling model is used to simulate the diffusion characteristics of heated water discharged into sea.The calculation results show that the temperature of discharged hot water decreases with the increased water depth,meanwhile,the heated water is falling in temperature while it spreading from offshore area to open sea.In addition,reciprocating tidal current limits overall diffusion range of heated water.