Caofeidian sea area is an important ecoregion of Hebei province. It's meaningful to investigate the pollution situation of this area. Firstly, a numerical model of tidal flow and pollutant transport based on Delft3D-FLOW is established to simulate and analyze COD distribution in Caofeidian sea area. Then, the model is verified by measured data. Finally, the flow field and COD concentration in this area are analyzed, and general suggestion for control COD is presented.

Caofeidian is a large harbor being constructed in north of China. It is greatly meaningful to investigate the pollution situation of this area. In this paper, firstly, a tidal flow and pollutant transport numerical model based on Delft 3D-FLOW was established and verified by measured data to simulate and analyze phosphate distribution in Caofeidian sea area. Then, phosphate concentration under six hydrological conditions (spring, middle and neap tides of flood season; and spring, middle and neap tides of dry season) was computed by this numerical model, and the comparisons were made between the computed phosphate concentration at the boundary of the mixing zones and corresponding water quality standards. At last, the allowances discharge amount and cut rate of phosphate of each outfall was calculated. The results show that the high phosphate concentration appears the sea area around the river outlets of Douhe and Shahe, and the phosphate concentration of Douhe and Shuanglonghe rivers’ mixing zones exceed their allowed standard values, the total phosphate discharge from these rivers must be cut down.

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