Waterlogging,water pollution,black and odorous water,and riverine and lacustrine ecological degradation are the main water problems faced by China's cities,which have become one of the key obstacles to the green development of the Yangtze River Economic Belt.In-depth understanding of the evolution of the water system in the process of urban development and the mutual influences between the elements,clarifying the formation mechanism of the urban water problems,and constructing an integrated treatment technology system of the urban water system are the fundamental ways to solve the complex urban water problems.Aiming at the abovementioned urban water problems,this paper summarizes the concepts and characteristics of the urban water system from a systematic perspective of the multiple processes coupled with each other in the water cycle and proposes a key technology system for a systematic solution to the urban water problems,which are demonstrated with the treatment examples of the urban agglomeration in the Yangtze River Economic Belt in 2016-2022.The demonstrative applications show that the pumping stations and sponge measures can effectively reduce the severely inundated area of Wuhan city in extreme rainfall events and eliminate the waterlogging points in the Chengdu-Chongqing urban agglomeration;the proposed microbial-botanical-hydrodynamic integrated synergistic regulation and control technology can significantly enhance the removal efficiency of the nitrogen and phosphorus level in typical black and odorous water bodies of Wuhan city;the proposed source control-path dissipation-terminal regulation comprehensive ecological treatment system for urban rivers and lakes decreased the water eutrophication level significantly in the Lianghe River basin of Chongqing city;with the implementation of the abovementioned treatment technology system,the green development index of the urban agglomeration in the middle reaches of the Yangtze River increased by an average of 4.8％.This study provides theoretical and technical support of urban water system for the major strategies of the green development of the Yangtze River Economic Belt.
关键词
城市水系统/水环境/绿色发展/内涝/城市群/长江经济带
Key words
urban water system/water environment/green development/waterlogging/urban agglomeration/Yangtze River Economic Belt
维普
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