Research On The Construction And Optimization Strategy Of The Rainwater Management System For The Linjiang Avenue In Wuhan City

During the urbanization process,natural surfaces are covered by impermeable hard materials like roads and buildings,causing a degradation in the ability of natural rainwater management.This has led to frequent urban flood crises that affect the sustainable development of the region’s ecosystem.Streets,as the basic framework of the city,are key areas for rainwater management and the main focus of attention.Therefore,this paper aims to construct a street rainwater management system and propose optimization strategies for street rainwater management,providing a reference for alleviating urban street flood problems.Wuhan City,located in the middle reaches of the Yangtze River,experiences rainfall on almost one-third of the year.Linjiang Avenue is one of Wuhan’s first sponge city pilot streets and has accumulated some rainwater management experience.Thus,we based our study on the current situation of street rainwater management and constructed a "threecore-one-pipe" rainwater management system for Linjiang Avenue.We optimized the processes of interception,retention,and reuse of rainwater on the street.By simulating scenarios using the I-Tree and SWMM models,we analyzed the rainwater interception,green infrastructure detention,and street rainwater reuse under different weather conditions(normal,heavy rain,and drought)and proposed optimization principles,goals,and specific strategies.We subsequently optimized plant configuration,facility structure,material,and site details to address the problems of rainwater management on Linjiang Avenue and alleviate the pressure of urban drainage.The main research results of this paper are as follows:(1)Construction of a "threecore-one-pipe" rainwater management system including three core parts and a management method.The core parts are the interception of rainwater by the crown layer of trees along the street,the detention of rainwater by green infrastructure,and the natural reuse of street rainwater.The management method uses an Internet of Things(IoT)monitoring system,ensuring that the system operates efficiently and stably and improves the utilization rate of rainwater resources.(2)Proposing a street rainwater management optimization strategy,including plant configuration optimization and rainwater facility optimization.By optimizing the plant structure on road medians,channelized islands,and slope greening,the rainwater interception efficiency of the street increased by 0.4%,saving 6,117.4 tons of water annually and reducing water expenses by CNY 295,600.Through green infrastructure optimization,the natural reuse rate of rainwater increased by 24%-41%,while the annual flow volume decreased by 50%-70%.This approach effectively promotes the use of rainwater and reduces the dependence of streets on traditional water sources.