液化天然气接收站冷排水余氯对近岸海域生态环境影响的三维数值模拟

doi:10.11978/2024140

Abstract

Abstract:

The cold drainage of an LNG (liquefied natural gas) terminal affects the ecological environment of the adjacent sea area. Taking the Shenzhen LNG terminal as a case study, the MIKE 3 hydrodynamic residual chlorine model was used to calculate the transport mechanisms of residual chlorine in seawater, and the influence of cold drainage of the Shenzhen LNG terminal on the ecological environment of Dapeng Bay was analyzed. The calculated tidal level and tidal current at different water depths were verified with the measured data, which confirmed 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 were calculated, as well as the interaction of multiple emission sources, under typical spring and neap tide conditions. The results show that the diffusion scope of residual chlorine in the surface layer and bottom layer was greater than that in the middle layer, and the residual chlorine mainly affected the nearshore sea area and had no direct impact on the sensitive targets of the surrounding water environment and the water intake of other projects. The results of this paper can provide corresponding reference for the three-dimensional numerical simulation of cold drainage, site selection and ecological environment impact assessment of LNG terminals.

Key words: liquefied natural gas (LNG), cold drainage, residual chlorine, ecological environmental impact, three-dimensional numerical simulation

CLC Number:

LIU Wenming, LIU Yuqiao. Three-dimensional numerical simulation of the effect of residual chlorine in cold drainage of liquefied natural gas terminal on ecological environment in coastal waters[J].Journal of Tropical Oceanography, 2025, 44(3): 217-223.

Figures/Tables 9

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工程名称	取排水量/(m³·h^-1)	取水深度/m	排水深度/m
东部电厂	228420	4.8	表层
大鹏LNG	38400	表层	7.8
深圳LNG	38400	3.8	8.3

站位	经度	纬度	观测内容	观测时段	备注
P1	114°16′24″E	22°35′13″N	潮位	2023.07.04—07.05	大鹏湾盐田港
P2	114°26′05″E	22°35′02″N	潮位	2008.05.21—05.22	工程区
P3	114°24′29″E	22°28′39″N	表、中、底层流速	2008.05.21—05.22	工程区周边海域
P4	114°26′24″E	22°33′29″N	表、中、底层流速	2008.05.21—05.22	大鹏湾中部

水层	包络面积/km²		最大扩散距岸距离/km
水层	大潮	小潮	大潮	小潮
表层	2.27	1.33	1.13	1.07
中层	0.91	0.52	0.59	0.52
底层	1.33	0.85	0.82	0.78

Three-dimensional numerical simulation of the effect of residual chlorine in cold drainage of liquefied natural gas terminal on ecological environment in coastal waters

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