长江口南港化学需氧量动力学模型的应用

3D hydro environmental model of COD distribution in Nangang of Yangtze estuary

分析了长江河口南港的化学需氧量(Chemical Oxygen Demand,即COD)的断面分布实测数据。应用Hydroqual公司的环境生态动力学模型EFDC在长江河口河段建立了三维的化学需氧量动力学预测模型,用此模型得出南港区域的化学需氧量的三维空间分布及其随时间的沿程变化。数值结果显示该区域化学需氧量分布趋势大体为:排污口附近较多,枯水期更为明显;丰水期由于长江径流的稀释作用,其浓度大大降低;将数值模拟的结果和现场观测值进行了对比,表明三维环境生态动力学模型EFDC是基本可行的预测模式。

By application of hydro environmental model EFDC of Hydroqual Co. in Nangang of Yangtze estuary, temporal and special variation of chemical oxygen demand （COD） distribution was obtained by setting up a 3D water quality calculation. Also field observation data were available and compared with the numerical results. It is concluded in dry season and neap tide concentration of COD is much higher than in flood season and high tide, also prove the EFDC model is of satisfactory accuracy in water quality modeling of Yangtze estuary.