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Numerical Simulation for Ammonia Nitrogen, Phosphate and Algal Production in the Dalian Bay

Author: PuXiangHua
Tutor: ZhouJiTi
School: Dalian University of Technology
Course: Environmental Engineering
Keywords: Dalian Bay Water Quality Model Numerical Simulation Load distribution Control Technology
CLC: X55
Type: PhD thesis
Year: 2006
Downloads: 674
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Abstract


In this paper, the main research Dalian Bay sea area to the main pollutants Dalian Bay ammonia and phosphate as the main research object, based on historical data and monitoring data analysis, numerical simulation technology, the establishment of Dalian Bay for major pollution simulation substance ammonia - phosphate and algae growth forecast seasonal three-dimensional water sports - water quality model. Model reproduces the Dalian Bay hydrological factors and major pollutants - nitrogen and phosphate in Dalian Bay water distribution variation, qualitative analysis of nutrients (mainly refers to ammonia and phosphate) structure on the impact of the production of algae, phytoplankton predicted The spatial distribution characteristics and seasonal variation mechanism of pollutant load of emissions and emission changes in position on the Dalian Bay water body, and based Tecplot graphics tools for Dalian Bay water quality modeling data visualization for Dalian Bay water quality planning and management to provide a scientific basis. Simulation results show that the outfall area water exchange capacity is weak, after being discharged pollutants can not be diluted, and the accumulation of the pollution. Top at the bay, the diffusion process affecting the ammonia nitrogen, phosphate and algae carbon concentration of the main factors; in the central bay, the nitrification process is the main factor affecting ammonia concentration, phytoplankton mortality was the main factor affecting the concentration of phosphate, phosphate The content is the limiting factor in algae growth. Terrigenous load is the main source of ammonia, the underlying humus decomposition supplementation is Bay Central and Wan mouth area the main source of phosphate. Dalian Bay nutrient loading on water quality impacts are mainly concentrated in the top of the outfall Bay area, with the increase of water pollutant load corresponding rapid increase in the concentration of pollutants, nutrient for algae production are increasingly affected small. Total load changes on the production of algae and phosphate load effects similar to algae, ammonia loading greater than the impact on the algae, and in the bay at the top of Dalian Bay, the average N / P ratio is much higher than 16. Ammonia concentration and phosphate concentration changes on algae growth qualitative analysis also shows that the top of the bay, is the limiting nutrient phosphate. Since the high bay inorganic nitrogen input, N / P value increasing, in this case, once a high phosphorus input, it may lead to some kind of occurrence of algal blooms. Phosphorus emissions can be controlled by controlling the growth of algae in water Dalian Bay. Different emission location of the Dalian Bay water body affected differences reflect differences in self-purification capacity of local waters. If the discharge point source water exchange capacity located near the mouth of the Bay of terrigenous boundary, pollutants entering the waters under dynamic action in the marine environment will be transported quickly spread and not accumulate in the vicinity of point sources.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Marine pollution and its prevention
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