长江南通段大型排污口退水影响预测

Prediction of influence of large-scale sewage outlet in Nantong reach of Yangtze River

根据长江南通段的水动力、污染物输移特征,建立了平面二维非稳态水流水质模型,并利用实测的水文资料进行模型验证。结果表明,无论是流场的整体形态还是验证点的水位、流速都与实际情况符合较好。以南通市观音山污水处理厂、开发区第一污水处理厂入江整合排污口为研究实例,预测了该排污口在90%保证率下尾水对纳污江段的水环境影响,旨在为该类型河段的排污口退水影响预测提供技术依据。

Based on the characteristics of water flow and pollutant transport in the Nantong reach of the Yangtze River, a two-dimensional unsteady hydrodynamic and water quality coupling model was established. The model was validated using measured hydrological data. The simulation results were satisfactory and the model can predict the variation trend of tidal flow accurately. A case study was conducted at an integrated sewage outlet of the Guanyinshan Sewage Treatment Plant in Nantong City. The designed hydrological condition considered the combination of the low flow at a 90% guarantee rate and the typical courses of spring tide and neap tide. Under these typical hydrological conditions, the influence of the integrated sewage outlet in the Nantong reach of the Yangtze River was simulated. This study provides a technical basis for the prediction of the influences of sewage outlets in similar river reaches.