Study on the impact of ecological water replenishment on water quality in urban rivers
Ecological water replenishment is an important way to improve the water quality of urban rivers with high pollution load and serious base-flow shortage during dry season.In order to clarify the response relation-ship between urban river water quality improvement and ecological replenishment water quality and quantity,based on the one-dimensional hydrodynamic and water quality coupling model,this study applied Monte Carlo random sampling method to construct multi-scenario ecological replenishment analysis in Nanfeihe River.The response of the water quality of the main stream of Nanfeihe River to different replenishment conditions,and the water quality and quantity of upstream influent was analyzed.Results show that the water quality of Nan-feihe River and to the Chaohu Lake can be significantly improved by the replenishment of high-quality water.Due to downstream pollution along the river and the inflow of tributaries,the influence of water replenishment to improve water quality is gradually weakened from upstream to downstream.A consistent linear relationship between the concentration of the main stream water and the replenishment water quality is found.It highlights that attention should be paid to ensuring the water quality of the Nanfeihe River.
ecological water replenishmentdigital modelNanfeihe RiverChaohu Lake watershed