|长江感潮河段水流与污染排放引起的浓度场复杂多变，基于EFDC(Environmental Fluid Dynamic Code)模型，采用正交曲线网格拟合自然河道边界，建立了长江常州段的水动力和水质模型。采用现场同步实测资料，与计算结果比对，证明该模型在水动力和水质两个方面都与实测数据吻合较好，满足了实际工程的需要；同时由于长江水流运动较快，一阶降解动力学已经满足了化学需氧量(COD)、氨氮(NH3-N)和总磷(TP)浓度计算要求，可以不考虑它们复杂的生化反应过程。
|关键词: EFDC 感潮河段 水流 污水排放 浓度
|Numerical Simulation on Pollutants Concentration Field in Changzhou Reach of Yangtze River by EFDC Model
iangsu Environmental Protection Department, Nanjing, Jiangsu 210036, China
|The concentration field caused by discharged pollutant were complex in the tidal reach of the Yangtze River.By the use of orthogonal curvilinear grid fitting river natural border, the hydrodynamics and water quality model on Changzhou Reach of Yangtze River was built based on EFDC model. The comparison between observations and the results of calculation showed that both the hydrodynamics model and the water quality model agreed with the observations well, and the model could satisfied practical engineering. Because of the large velocity of Yangtze River, the first order decrease mechanics was good enough to calculate the concentrations of COD, NH3-N and TP, and the more complex ecological reaction would not be considered.
|Key words: EFDC Tidal river Water flow Wastewater discharge Concentration