大连长兴岛马家咀排污口海域环境容量研究

Study on marine environmental capacity around sewage outfall in Majiazui of Changxingdao Island， Dalian

摘要: 基于无结构网格的MIKE 3D模型，建立了长兴岛海域三维潮流水质数学模型.按照海洋功能区划的水质要求，综合分析离岸排放的特点，计算马家咀排污口的混合区面积及污染物浓度响应系数，进而对马家咀排污口近期和远期环境容量进行计算.结果表明，根据2012年海水水质现状，马家咀排污口近、远期混合区面积最大为0.046 5 km²，各主要污染因子化学需氧量（COD）、无机氮（DIN）、活性磷酸盐（PO^3-4-P）和石油类的剩余环境容量分别为812.0、143.7、25.6、59.7 t/a.

Abstract: A 3D tidal and water quality numerical model is established in Changxing Island area， based on unstructured MIKE 3D model. According to the seawater quality requirements of the marine functional zoning and general analysis on offshore discharge， the area of pollutant mixing zone and the concentration response coefficient are calculated. Besides， the marine environmental capacity is calculated in both short and long term. Results reveals that the maximum area of pollutant mixing zone is 0.046 5 km² around Majiazui sewage outfall based on the water quality in 2012. The water environmental capacity of COD， DIN， active phosphate and oil are 812.0 t/a， 143.7 t/a， 25.6 t/a and 59.7 t/a， respectively．