THREE－DIMENSIONAL MODELLING OF HYDRODYNAMICS AND WATER QUALITY IN COASTAL WATERS

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THREE-DIMENSIONAL MODELLING OF HYDRODYNAMICS AND WATER QUALITY IN COASTAL WATERS

Dalian Bay is a large coastal embayment situated in the Yellow Sea. The bay is heavily industrialised and the surrounding water they receives large amounts of industrial effluent. A numerical model of water quality in Dalian Bay has been developed to study the long-term transport and fate of pollutants in the system. In order to model the water quality of an estuary or coastal area many interdependent processes need to be simulated. These may be conveniently separated into three main groups: transport and mixing processes, biochemical interaction of water quality variables and the utilization and re-cycling of nutrients by living matter.The waters of Dalisn Bay are stratified due to the density variations resulting from the seasonal variations in meteorological conditions. In order to simulate the vertical structure of the hydrodynamics and pollutant transport in the bay the three-dimensional segmented and layered hydrodynamic model has been utilised. The results are used to drive the water quality model which simulates full oxygen and nutrient balance, primary productivity and the transport,reaction mechanism and fate of pollutants. The model has been used to study seasonal effects.The model has been calibrated against a limited data set of historical water quality observations and in general demonstrates excellent agreement with all available data.