董家口尾水排海环境影响数值预测及排放口比选研究

发布时间：2018-09-08 07:37

【摘要】：采用二维平面潮流数值模拟的方法对董家口港区尾水排放口位置进行比选研究,预测4个拟选排污口分别在尾水正常排放和事故排放两种工况下各水质污染因子的环境影响范围,并结合水深、动力条件等因素最终选定最优排污口.结果表明:研究海区海流以潮流为主,潮流性质为半日潮流,潮流运动形式以往复流为主,旋转为辅,海域涨落急流向为SW—NE向,整体上西防波堤—LNG码头连线南侧海域的水动力条件较好.经数值模拟预测研究,位于西防波堤南侧的P4排污口所在海域水动力条件活跃,水深条件适宜,有利于物质扩散,且事故条件下对日照海域和日照西施舌种质资源保护区影响小,为较优尾水排放点.同时P4排污口所在海域执行三类水质标准,污水数值模拟结果显示该排污口各污染因子超三类水质标准的面积均小于0.742 km2,NS向扩散距离均小于0.34km,扩散趋势与潮流方向一致,有利于其污染物稀释扩散.本次模拟预测客观地反映了污染物排海后的浓度变化和运动规律,为尾水排海污染物进行总量控制及海洋环境开发管理规划提供了科学依据和技术保障.
[Abstract]:The location of tailwater discharge outlet in Dongjiakou Port area is studied by using two-dimensional planar tidal current numerical simulation method. The environmental influence range of each water quality pollution factor under two working conditions of tailwater normal discharge and accident discharge were predicted respectively, and the optimal sewage outlet was finally selected by combining water depth and dynamic conditions. The results show that the current is mainly tidal current, the nature of tidal current is semi-diurnal tidal current, the main form of tidal current motion is reciprocating current, the rotation is auxiliary, and the rising and falling jet direction of sea area is SW-NE direction. On the whole, the hydrodynamic condition of the south side of west breakwater-LNG wharf is better. By numerical simulation and prediction, the hydrodynamic conditions of the P4 sewer in the south side of the west breakwater are active and the water depth is suitable, which is beneficial to the material diffusion. Under the condition of accident, the effect on Rizhao sea area and Rizhao Xishi tongue germplasm resource reserve was small, and it was the best tail water discharge point. At the same time, three kinds of water quality standards are implemented in the sea area where the P4 sewage outlet is located. The results of numerical simulation show that the area of each pollution factor exceeding three kinds of water quality standards is less than 0.742 km2,NS and the diffusion distance is less than 0.34km. the diffusion trend is consistent with the trend of tidal current. It is beneficial to the dilution and diffusion of pollutants. This simulation forecast objectively reflects the concentration change and movement law after pollutant discharge, and provides scientific basis and technical guarantee for the total amount control and marine environment development management planning of pollutants discharged from tail water.
【作者单位】：国家海洋局第一海洋研究所;
【基金】：国家自然科学基金资助项目(41276084)
【分类号】：X55

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