Study on the effect of ecological water supplement on water quality and quantity in Chengnan River
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Abstract:
In order to improve the low discharge, low water level, insufficient hydrodynamic force and serious water pollution in urban rivers during the dry season, the effect of ecological water supplement schemes in the Chengnan River of Nanjing City was studied. By comprehensively considering the water quality conditions of the upstream and downstream, and the tributaries in the dry season, the water supplement scheme was set up according to the difference of water supplement quantity and mode (inclu_x005f ding intermittent water supplement and continuous water supplement). The coupling model of water quantity and quality of MIKE11 was established in the study area. The changes of pollutant COD,NHs-N,TP reduction rate and velocity distribution under different water supplement schemes were simulated and analyzed. The effect of different ecological water supplement schemes was obtained. The results showed that with the increase of water supplement, the concentration of pollutants decrease rate was fast and then slow. The intermittent water supplement scheme was better than the continuous water supplement scheme. Ecological water supplement had a significant effect on reducing pollutant concentration, but the improvement of the water quality in the long and tortuous river was not obvious. The effect of ecological water supplement on the improvement of the velocity distribution was obvious, but due to the influence the river structure,careful consideration needed to be made to de termine the water supplement point.
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