Research On LID Optimization Of Road And Open Space Based On Multi-objective Programming

In recent decades,China's urbanization process is in a very significant stage.The city is expanding,urban road network is also expanding and perfecting,the city's ground hardening rate continues to improve,changing the natural conditions of the hydrological and ecological cycle.In this case,we should vigorously promote the development of roads and open spaces with low impact development.This study mainly focuses on the road and open space to study the multi-objective planning based on a variety of low-impact development measures to optimize the way to ease the city waterlogging,reduce runoff pollution,conservation of groundwater is of great significance.This study analyzes the ecological functions of various measures from the low impact development measures of road and open space.In the case of ecological function satisfaction,75 types of road and open space LID design are proposed.This paper studies the construction method of LID design optimization model for road and open space,and determines the construction principles to meet the basic functions,rational selection,overall and ecological optimization,and studies the objectives to determine the cost of economic objectives,low impact development Measures for the rainwater runoff TSS removal rate for the environmental objectives,to the amount of infiltration,stagnant volume and evaporation for the social objectives of the multi-objective system.Combined with the requirements of the development of road and open space,the decision variables are determined,and the multi-objective optimization model is established with the road area,capacity,green coverage,sidewalks and non-negative constraints.On this basis,according to the actual situation in Beijing,calculate and determine the Beijing area optimization model.The application of LID multi-objective optimization is carried out on the seven-route of Sunhe Group in Beijing.The genetic algorithm is used to solve the optimization results.The optimization scheme of LID design is determined.Contrast with the original design we found that,after optimized,the economic objectives,environmental objectives and social objectives of Beijing Sunhe Group the 7th Road increased by 8%,140% and 123% respectively.This topic is based on the road and open space as the research object,through the optimization of LID design to change the urban hydrological ecology,at the same time to achieve economic,social,environmental and multiple objectives to maximize the efficiency of the road and open space,which provides a reference for LID design utilization and optimization.