城南河生态补水工程比选及水环境改善效果分析

摘要

城市小流域河流在枯平水量时期易出现水质恶化问题.城南河是南京市主要入江支流之一,水量随季节性波动明显,现状水质超标显著.为改善其水质、维持生态流量,计划对河流进行阶段性补水.以长江水补济城南河工程为背景,借助Mike21水动力水质模块对补水工程水质改善效果进行研究,将50m、150m和800m不同架设距离的工程方案进行效果比选,经对比分析确定在断面前150m处布设补水管改善效果最佳.同时在相同工况下还针对布设不同出水口数量及调度情况进行模型模拟,最终确定五孔管道并开口上扬20.～30.出水为宜,以此结论为实际工程施工提供建议.%The small urban stream is prone to cause water quality deterioration during the dry water period.Chengnan River is one of the main branch in Nanjing,water quantity fluctuated in different seasons and current water quality significantly beyond the standard.In order to improve water quality,maintain ecological flow,planning to supplyclean water to the rivers.In this paper,water diversion project from Yangtze River to Chengnan River was taken as example,using Mike21 hydrodynamic water quality module,to study the water quality improvement effect..Comparing with different project schemes,set the water pipe 150 meters in front of the section and 5 holes is determined.It can provide suggestion for project implementation.