The Analysis And Research Of The Marine Environmental Capacity Of Pulandian Bay

Dalian Jinpu New District is located in the north of the city center, is a national new economic zone approved by the State Council. Jinpu New District has far-reaching significance on construction and development for Liaoning coastal economic zone development of marine economy, revitalizing the northeast old industrial areas, to further deepen cooperation in Northeast Asia. Jinpu New District is Planning and Construct around Pulandian Bay. Comprehensive understanding of the present situation,to properly assess the environmental quality to Pualandian Bay,accurating grasp of Pulandian Bay marine environmental capacity,the reasonable control of pollutant inputs and optimize the distribution of pollutant input has important theoretical and practical value of the total contamination of the Pulandian Bay volume control, environmental management, environmental protection and improvement.And for urban planning, industrial layout and economic development, it has great fundamental role and development of a very positive meaning for construction and development of Jinpu New District.In this paper, the research object Pulandian Bay water quality trends and the actual survey data as the basis, through numerical simulation, the establishment of marine water quality on the basis of analysis and research Pulandian Bay kinetics and capacity of the water exchange prediction model, analysis and research on the sustainability of Pulandian Bay pollutants(COD, phosphate, inorganic nitrogen) carrying capacity and environmental capacity, optimize the distribution of pollutant input, proposed cuts pollutants(inorganic nitrogen).Results of this study show that:1. In this paper, the measured data in April 2012 to build a two-dimensional hydrodynamic mode by using MIKE 21, and validated by four tide level verification points and five flow/ velocity of verification points. It proved that the numerical model has high credibility and can be applied to Pulandian Bay pollutant dispersion models. The results show that hydrodynamic intensity during neap was significantly lower than hydrodynamic intensity during the spring tide. Pulandian Bay compared to other similar size, flow rate is significantly less.2. This paper established a pollutant Convection-diffusion model, by using the tracer concentration method, Pulandian Bay has been divided into three regions to calculated the half water exchange period separately for each region. After comparative analysis,the ability to exchange capacity of the mouth in Pulandian Bay is better than the capacity at bottom. The overall Pulandian Bay, its water exchange capacity weak. The more powerful tidal currents, the shorter the half exchange period. Water exchange capacity and pollutant diffusion capacity largely determines the size of the outfall location selection. Accordingly proposes three Pulandian Bay pollutant discharge port layout scheme.3. To established Pulandian Bay marine environment pollutants capacity optimization numerical model to the maximum allowable emissions as the target function, it has simplified the model pollutant emissions Pulandian Bay marine environmental capacity as a linear programming problem. Forming in each emission port in the source 1t/d, and calculates the contamination control points within a tidal cycle(25h) to control the concentration increment factor, thus obtained average pollutant contribution of each control factor coefficient. Calculated by using Matlab to each outfall maximum allowable emissions of pollutants when the three joint outfall discharge planning. By comparison drawn optimal solution for each control factor in the three pollutants discharge port layout programs. Pulandian Bay COD maximum permissible load into the sea is 31.43t/d, the overall reduction in the amount of inorganic nitrogen is 951.90 t, the maximum allowable total phosphate load into the sea is 3.24t/d. The calculation results as input conditions, simulation of the emissions of pollutant concentration distribution, the concentration of each pollutant control points are in line with the corresponding value of the resulting water qualit requirements, and thus the maximum allowable target waters rationality to verify emissions.4. According to the basic principles of pollutant emission control, this paper need to take into account the Pulandian Bay coastal region corresponding uncontrollable factors and future economic development Pulandian Bay reserve corresponding emissions targets, as recommend pollutant emissions in accordance with the maximum allowable pollutant emissions by 70% is determined.Pulandian Bay to arrive at a proposal to allow the total COD load into the sea is 22.00t/d,, phosphate is recommended to allow the total load into the sea is 2.27 t/d.