Determining The Scale Of Green Infrastructure In A Sponge City And Evaluating The Coupling Of Gray And Green

With the development of urbanization,the contradiction between the development imbalance between society and the ecological environment has increased to a great extent.The rapid development has led to the continuous expansion of the surface impervious area,which has caused the total amount of urban runoff to exceed the original level,the surface runoff sink flow has increased,the urban rainwater pipe network drainage pressure has increased,and urban waterlogging has occurred frequently.The proposal of the concept of sponge city provides new ideas for urban rainwater discharge.Green rainwater drainage infrastructure has gradually become an implementable eco-technical means,which can reduce urban surface runoff and solve problems such as waterlogging and waterlogging in the site under certain conditions.This provides a basis for the research on the combination of green rainwater drainage infrastructure and traditional gray rainwater pipe network to jointly drain rainwater.The coupling and synergy of gray and green rainwater drainage infrastructure has also become the trend of the development of sponge cities in the future.In this paper,the purpose of ash and green rainwater drainage infrastructure is to discharge rainwater together.In order to make the two better coupled and coordinated,and to be able to more accurately arrange green rainwater drainage infrastructure,the comprehensive plane and vertical site scope are analyzed.The construction area has also determined the range of its location selection.Based on the calculation methods for the storage capacity of various green rainwater drainage infrastructures,with the maximum absorption of rainfall and the minimum comprehensive cost as the control objectives,a green rainwater drainage infrastructure scale optimization model was established to determine the area scale of various facilities.Finally,a gray and green rainwater infrastructure coupling evaluation system is established,and the coupling coordination degree of the two is calculated to evaluate the coupling effect.It provides a theoretical basis for the precise location of green rainwater drainage infrastructure,and also provides a theoretical and quantitative basis for the study of the coupling effect of ash and green rainwater drainage infrastructure in the construction of sponge cities to drain rainwater and reduce surface runoff.