LNG工程冷排水排放会对海域水环境产生影响。依托深圳LNG项目，利用三维水动力余氯模型（MIKE3）计算了余氯在海水中的运移规律，分析了深圳LNG工程冷排水对大鹏湾海域水环境的影响。将计算的潮位和不同水深处的潮流与实测数据进行了验证，证实了所建立三维水动力模型的可靠性。在此基础上，计算了典型大、小潮条件下受纳海域余氯浓度增量的水平和垂向三维空间分布特征，以及多排放源的相互影响。结果表明：余氯未对周边水环境敏感目标和其他工程取水产生直接影响。

The Cold drainage of LNG project have an impact on the water environment in the sea area. Based on the Shenzhen LNG project, the 3D hydrodynamic residual chlorine model (MIKE3) was used to calculate the migration law of residual chlorine in seawater, and the influence of cold drainage of Shenzhen LNG project on the water environment of Dapeng Bay was analyzed. The calculated tidal level and tidal current at different water depths are verified with the measured data, which confirms the reliability of the established 3D hydrodynamic model. On this basis, the horizontal and vertical three-dimensional spatial distribution characteristics of residual chlorine concentration in the receiving sea area under typical spring and neap tide conditions, as well as the interaction of multiple emission sources were calculated. The results show that the residual chlorine has no direct impact on the sensitive targets of the surrounding water environment and the water intake of other projects.