Abstract
The underwater topography in the offshore sea area of north Jiangsu is complicated, including the middle radial sand ridges and northern Haizhou bay underwater shoal. Therefore, it forms special marine dynamic conditions and typical shoal wetland ecosystem. Previous researches of these sea areas were mainly focused on the forms of morphogenesis and the characteristic of conformation of sand ridges. Few studies have done on three dimensional hydrodynamic and water quality simulation. This paper introduced EFDC (Environ-mental Fluid Dynamics Code) to study the tidal current fields, dilution and diffusion of the sewage outlet near Yangkou Port. Comparison between computation results and the observed data indicates that this model could reasonably simulate hydrodynamic fields. Based on the computed tidal current field, the distributions of COD concentration were simulated. The range of contamination diffusion derived from sewage outlet was very limited, and the influence range of sewage came to the maximum when ebb slacks in neap tide period.
Highlights
Due to long-term environmental pollution, over-exploitation and other reasons, overall coastal water environment and quality of north Jiangsu have continued to drop
Environmental Fluid Dynamics Code (EFDC) model was selected for this study
This paper examines the special hydrodynamics characteristics in radial sand ridges area of the Yellow Sea
Summary
Due to long-term environmental pollution, over-exploitation and other reasons, overall coastal water environment and quality of north Jiangsu have continued to drop. Sea and land-sourced pollution and beach reclamation are main factors which have influenced the water quality environment. Research domain includes the radial sand ridges which are complicated underwater topographies, located in seaboard of Jiangsu Province, which is in the sea area of south continental shelf in the Yellow Sea, from Sheyang. The area in the north of Jianggang is influenced by revolving tidal wave system, while the area in. Do two tidal wave systems enlarge the tidal range of shallow sea in the area of radial sand ridges, and shape the radial tidal current field. Previous main researches of north Jiangsu offshore sea area were focused on the forms of morphogenesis and the characteristic of conformation of sand ridges.
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