Application Status on Hydrological Detention Efficiency of Urban Green Space in China

Abstract

With the acceleration of China’s urbanization process, the expanding city scale has caused serious damage to the urban water system and natural water processes, which has led to the increasingly serious urban rainfall flood disasters. Developed countries have more experience in urban diseases, so the research on urban stormwater management and utilization has been Relatively well. For the study of the impact mechanism of green land demurrage, foreign countries have a relatively complete theoretical system and a large number of case practice tests. These rich practical experiences can be used as a reference for China. However, combined with China’s special national conditions and regional characteristics, we still need to carry out deeper and more local research. While domestic research on green land rain and flood detention is concentrated in water conservancy, plant protection and other disciplines, lacking different environmental characteristics for the city, In the perspective of macro-planning, the quantitative calculation of green space depletion efficiency capacity based on factors such as soil conditions, vegetation types, rainfall conditions.Urban green space is the main natural carrier of the rain stagnant. It is the main part of the construction of the sponge city. However, the currently attention of urban green space planning more focus on the ecological function such as oxygen release. It is relatively insufficient on the evaluation and planning studies on the efficacy of green area rainwater stagnation. By establishing the quantitative relationship between the characteristics of rainfall, runoff, soil, vegetation and other factors and the stagnant capacity of green space rainwater, the comprehensive impact mechanism is evaluated, and the artificial measures of rainwater control are combined to adjust the spatial pattern of urban green space , which is to improve the green storage efficiency. The use of indispensable content is also an inevitable development trend in the application of rainwater flood management in future urban green space depletion efficiency.