Ecological Water Replenishment Scheme for Urban River and Lake Based on Hydrodynamic and Water Quality Coupling Model:A Case Study of Donghu-Shahu Lake Water System in Wuhan City
Ecological water replenishment of urban rivers and lakes is of significant importance for the sustainable development of cities and meeting people's living needs.Shahu Port and Luojia Port are located in central urban area of Wuhan and serve as water diversion channels for Donghu-Shahu Lake water system in river diversion project from the Yangtze River to the Lakes.This paper explores the ecological water replenishment scheme for diverting water from the Yangtze River to the Shahu Port and Luojia Port,taking into account the overall layout of Donghu-Shahu Lake water system and its connection.A two-dimensional hydrodynamic and water quality coupling numerical model is established to simulate the operation effects of ecological water replenishment scheme.Results indicate that concentration of total phosphorus and NH3-N decrease significantly in Luojia Port and Shahu Port(from Qingshan Port to Luojia Port section)when diverting water from Wuhan Iron and Steel Pump Station.Although there is a certain degree of water exchange in Shahu Port(from Xudong Street to Luojia Port section),the improvement of water quality in this section is extremely limited.Due to the high concentration of total nitrogen and total phosphorus in the Yangtze River,effect of ecological water replenishment on reducing total nitrogen concentration is very limited.Therefore,it is necessary to prevent the risk of water eutrophication when diverting water from the Yangtze River to port channels.The research findings can provide a reference for the quantitatively assessment of ecological water replenishment of urban rivers and lakes.
ecological water replenishment schemehydrodynamic and water quality coupling modelWuhan City
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