Abstract:Under the background of Yangtze River Delta integration and Shanghai’s initiative to build a "People’s City," urban small and medium-sized rivers are required to ensure both flood control safety and ecological livability. Focusing on the eastern sub-area of the metropolitan livable eco-clean small watershed in Miaohang Town, Baoshan District, Shanghai, and based on the planning, design and field investigations, the key issues in the water system pattern, riverside space and aquatic ecology are sorted out. With reference to the eco-clean small watershed construction requirements of Shanghai, a governance performance evaluation system is established, consisting of three dimensions and six indicators of water system configuration and water surface scale, water space and aquatic ecology. On this basis, the effects of engineering measures such as river dredging, water system connectivity, ecological revetment, aquatic ecological restoration and water clarity enhancement are analyzed together with a long-term and stable operation and management mechanism. The results show that the compliance rate of river-lake area, the ecological protection ratio of the water system, and water quality and aquatic vegetation conditions are all significantly improved, indicating good comprehensive management of the small-watershed scale. The research result shows that this evaluation system and the integrated engineering-management model can provide a reference for the construction of urban eco-clean small watersheds.
