南通市高水系引江调水水质改善分析与方案优化

为了改善南通市高水系区域河道的水环境质量，有关部门制定并实施了引江调水方案，即利用南通市西南沿江的涵闸引长江水，并通过东北沿海的涵闸排水。在引江调水前后，有关部门依据监测资料分析了区域内骨干河道和二、三级河道的水质改善效果。分析结果表明：引江调水对改善南通平原河网的水质总体上效果明显，但对局部河段及区域，特别是水系河道末端，由于水流流速降低及污染物逐渐集中，水环境改善效果不佳。针对目前引江调水调度方案存在的问题，提出优化完善高水系区域引江调水方案初步思路。

Analysis on water quality improvement effect of river system in Nantong by water diversion from Yangtze River and scheme optimization

In order to improve the water environment of river system in Nantong area,the related departments made and implemented the water diversion from Yangtze River,namely,diverting water from the sluices along the Yangtze River and discharging it into the sea by sluices in the northeastern costal area.Before and after water diversion,the related departments analyzed water improvement effect of major channels and grade 2 or 3 channels based on monitored data.The analysis results show that in general,water diversion has an obvious effect for water quality improvement in river system in the plain,but in local reach and area,especially in the tail-ends,the effect is not obvious.The reason includes flow velocity decrease and pollutant concentration.In the light of the existed problems in the present water diversion scheme,a preliminary thinking on the scheme optimization and improvement is put forward.