Abstract
In the background of the urbanization process has exceeded 58% of China and expansion of the construction land expansion, as a future appropriate residential development and ahead of the key area of urban rain flood management, this research expounds the new cities and new district how to follow the principle of ecological priority in different application field, and how to use land for urban green space and ecological protection for elastic development and rain flood management. The study of the new cities’ eco-rain flood management model is of great significance for the governance and sustainable development of urban diseases in China.By combining natural ways with artificial measures, planning is carried out in advance.On the premise of ensuring the safety of urban drainage and waterlogging prevention, the accumulation, infiltration and purification of rainwater in urban areas can be realized to the maximum extent, and the utilization of rainwater resources and ecological environment protection can be promoted in new cities. To make plan ahead,to avoid the problems of rain and flood in existing urban areas, and improve the livable quality of new cities greatly.New ways of thinking and construction guidance are proposed for ecological livable construction and flexible rain flood management of new urban areas in China.
Highlights
With the acceleration of urbanization, the construction land expands with high intensity and human activities interfere with the original natural ecosystem
Longtan new city is close to the Yangtze river and Baohua mountain two ecological corridor.The planning area is densely covered with numerous water systems. [Fig.2] The average width is about 15‐70 meters and constitutes a good ecological background for the new city.At the same time, it has a large number of artificial secondary wetlands caused by fish ponds, reservoirs and rice paddies.The integration of ecological sustainable rainflood construction is one of the important modes to build a livable new city of Longtan, and an important strategy to protect the ecological quality of the Yangtze river economic belt
The structure of ecological sensitivity analysis of Longtan new city was obtained by the superposition of biodiversity and river system factors through GIS spatial analysis.Among them, the high sensitive area accounts for 38%, mainly in the constructed area.The medium sensitive area accounts for 49%,mainly in the areas of agriculture and forestry.The high sensitive area accounts for 13%, mainly in the areas of coastal tidal mudflats, river systems and mountains. [ Fig.4]
Summary
With the acceleration of urbanization, the construction land expands with high intensity and human activities interfere with the original natural ecosystem. China's current urbanization rate has exceeded 58%, which is in the period of concentrated outbreak of urban diseases.The increase of the proportion of mat surface under water proof significantly changed the original natural hydrological ecological process. These processes lead to frequent occurrence of rainstorm waterlogging and deterioration of river ecological function non-point source pollution.The traditional urban planning is "based on drainage", and the pipe network project (grey infrastructure) "hard drainage" ,lacks natural and ecological rain and flood control facilities.Unreasonable pipe network planning and design and unsound drainage facilities result in deterioration of water ecological environment in urban areas.The construction of ecological and livable new area is the latest idea and model of China new city construction.The new cities, as a key area for future development of suitable residential areas and urban rain flood management, is usually planned with higher green land rate and more natural ecological protection land, which is highly feasible in the construction of ecological rain flood.We can integrate the elastic construction concept into the pre-planning, avoid the problems of rain and flood in the old city, and help build the new ecological residential area into a livable one. The study of the new city's eco-rain flood management model is of great significance for the governance and sustainable development of urban diseases in China
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