曹妃甸海域磷酸盐容量控制

首先,建立曹妃甸海域潮流和污染物输运数学模型,并用实测资料对模型进行验证;然后,应用验证好的数学模型,计算六种典型水文条件(洪季大、中、小潮,枯季大、中、小潮)下该海域8个河流排污口和曹妃甸围填区混合区半径上的磷酸盐浓度,并与功能区要求的水质标准进行比较分析;最后,计算出磷酸盐的允许排放量和削减率.结果表明:磷酸盐超标的枯季为陡河和沙河,洪季为双龙河和围填区,应加强对这些河流相应季节磷酸盐排放量的控制.

Phosphate Capacity Control in Caofeidian Coastal Area

Caofeidian is a large being constructed harbor in north of China. It is very important for Caofeidian coastal area to scientifically control on pollution. In this paper, firstly, a tidal flow and pollutant transport mathematical model was established and verified by measured data. Then, phosphate concentrations under six hydrological conditions (spring, middle and neap tides in the flood season; and spring, middle and neap tides in the dry season) were computed by this verified mathematical 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 allowed discharge amount and cut rate of phosphate at outfalls were calculated. The research results show that the phosphate concentrations at the mixing zone boundaries of Douhe and Shahe rivers exceed their allowed standard values in the dry season, and the exceeding concentration occur in Shuanglonghe mixing zone and reclamation area in the flood season. The phosphate discharge amount from Douhe and Shahe rivers in the dry season and Shuanglonghe in the flood season must be cut down.