基于EFDC构建广州-佛山珠江潮汐河网水动力水质模型，利用4个重要控制断面及113条重要一级支流的水量水质监测数据对模型进行了率定验证，建立一级支流污染排放与控制断面水质的响应关系。通过模型量化各支流对水质控制断面的贡献率，并以重要断面的水质改善目标为约束，经模型优化求解得到主要一级支流的允许排放量及削减量，确定支流改善目标，为污染问题诊断识别、水动力条件改善、水环境质量提升提供重要技术支持。

The hydrodynamic and water quality model of Guangzhou-Foshan Pearl River tidal river network is constructed based on EFDC， the model is calibrated and verified by the monitoring data of water quantity and water quality of 4 important control sections and 113 important primary tributaries， and the response relationship between pollution discharge of primary tributaries and water quality of control sections is established. The model quantifies the contribution rate of each tributary to the water quality control section， and takes the water quality improvement target of the important section as the constraint， obtains the allowable discharge value and reduction quantity of the main primary tributaries through the optimization solution of the model， determines the improvement target of the tributary， and provides important technical support for the diagnosis and identification of pollution problems， the improvement of hydrodynamic conditions and the promotion of water environment quality.