黄浦江河口建闸对内河水环境的影响

Influence of Tidal Gate Construction at Huangpu River Mouth on Inner River Water Quality

应用一维水动力、水闸调度、水质的综合数值模型,定量分析了规划中的黄浦江河口挡潮闸对内河水质可能产生的影响.结果表明,挡潮闸建设总体上对黄浦江水质有改善效果,可减少污水在河道内回荡、滞留的时间,防止污水团上溯.另一方面,挡潮闸的运行将使内河水体流动变缓,复氧能力下降,从而使溶解氧质量浓度总体下降,并使河道排污口附近局部水体水质恶化.建议挡潮闸的建设应与黄浦江沿岸排污口和支流的治污截污工作相结合,以避免其负面影响.

A model system integrated ID numerical river hydrodynamic, gate operation and water quality was used to analyze quantitatively the influence of tidal gate construction at Huangpu River Mouth on the water quality of the inner watercourse. The modeling results show that the gate will in general improve the inner river water quality, reduce the pollutant travel time from its discharge point to the river mouth, and prevent pollutants from moving upstream. On the other hand, the pollutant concentration will increase after the gate construction near the discharge outlet of point sources and the confluence of polluted tributaries. Moreover, the dissolved oxygen concentration along the entire river will become lower owing to the decreased reaeration capability of the water body as the tide phenomenon disappears. It is suggested that the gate construction should be carried out together with the pollution control measures of point sources and polluted tributaries along the Huangpu River.