| China is in an important stage of rapid economic development,urban uncontrolled expansion has caused many urban disasters,and bear the brunt of the rain disaster.The problem is mainly reflected in the low utilization of rainwater,the loss of rainwater resources,the excessive runoff of rainwater,the serious pollution of water bodies and the increase of flood risk.Second,the "pie pie" type of development model also reduces the quality of urban landscape,making the city landscape regardless of form or function are tedious.Urban roads are one of the city's major infrastructure.China's urban construction land in the road land is generally 10%to 15%,some foreign cities even more than 30%to 40%,and still at an annual rate of 5%increase.Due to the large proportion of urban roads,urban road rainwater system is an important part of the whole city drainage system,in the process of dealing with urban rain has a pivotal position.Based on the low-impact development technology of urban road,through the combination of a series of different measures,cutting and accumulating rainfall runoff from the source can reduce the pollutant load in rainfall runoff,reduce the peak flow and the total runoff,It is of great significance to delay the flood peak time and the problem of urban water pollution in the process of urbanization.At the same time,a variety of low-impact development technology to bring a richer landscape effect,for breaking a single urban road landscape has an important role.The paper starts with the theoretical research on the development of rainwater system with low impact on urban road.The research contents include the principle of low-impact development of urban road rainwater system,planning and design principles,planning and design flow.And through the low impact of the development of technical measures to assess the comparison,select the pavement pavement,biological detention facilities and other measures applicable to urban roads,urban road construction to develop low-impact development of rainwater system planning and design strategies.On the basis of the theoretical research,the application research of the rainwater system planning and design of urban road low impact development is carried out.The research object is nine urban roads in Nanhu Area of Ziliu District,Zigong City:Huichuan Road,Dangui Street,Hing Chuan Street,South Road,Huibei Road,Tongda Street,Wei Road,Purple Road,Nanyuan Street.Based on the analysis of the study area,the analysis of the present situation of the site,the low impact development system planning and the low impact development measures,the rainwater system with low impact on the urban road of Nanhu area is constructed.Finally,based on the SWMM model,the energy efficiency of rainwater system developed by urban road low impact is studied.Through the SWMM model,the study of regional model construction and low impact development rainwater system energy efficiency analysis is carried out.The results show that the LID rainwater system can reduce the energy efficiency of the runoff,the energy efficiency of the LID single measure,and the energy efficiency of the LID rainwater system pollutant reduction.On this basis,the output data are analyzed and finally the corresponding conclusions are drawn.According to the above research,the article has obtained the following main results and conclusions:First,the urban road LID rainwater system strategy construction,must follow the overall principles and processes,and from the runoff path planning and LID measures to consider the combination of two aspects.Second,Zigong city road LID rainwater system planning and layout of flexible and efficient combination of measures,and measures the size of the structure design is reasonable,rich plant configuration.Third,the urban road LID rainwater system should be integrated with other LID systems,and through a variety of ways to achieve higher water control energy efficiency,its individual measures should be based on their own characteristics of the role of a clear positioning to ensure that play the appropriate advantages.The study on the low impact development of urban roads in Zigong City provides some ideas and methods for the future development of rainwater system with low impact on urban roads,and also provides an effective method and a way for the detection of low-impact development technology.Which plays an important role in enriching the urban road landscape and have great significance to solve the problem of urban rainwater treatment and the construction of sponge city. |
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