| As the concept of urban construction based on ecological concept becomes more and more important,,the evaluation of the rain and flood safety pattern has provided a new foothold for the scientific response to urban rain and flood disasters in our country.However,the existing theories are restricted by technical means and cross-professional research,and It is difficult to apply it properly in the practice of flood control in China.Therefore,based on the concept of stormwater safety pattern,combined with multidiscipline and multidisciplinary technical means to conduct intensive study,and enforce certain explorations on the planning response under the concept of stormwater safety pattern.Taking the rain and flood disasters in Quanzhou as the research object,firstly,the characteristics of different rain and flood disaster response concepts are summarized by combing and researching the concepts of response to rain and flood disasters at home and abroad.Using the theoretical system of disaster science,The Risk Factors,the susceptibility of disaster occurrence conditions and the partial vulnerability to disasters are selected as the analysis basis for the evaluation of rain flood safety pattern.Based on MIKESHE macro-hydrological simulation,SWMM micro-flow generation and convergence calculation,and the deployment,integration and transformation of spatial data on the GIS platform,the coupling and analysis of the rain and flood process from the macro to the micro are realized,and the rain and flood disasters in the city are determined through dynamic hydrological scenario simulation at the macro level.Risk spatial location and degree of action and calculate the maximum inundation depth and maximum runoff velocity of urban floods under extreme conditions.A total of 22 indicators such as land use,construction density,population,and GDP are selected for analysis to build a city-wide rain and flood safety pattern in Quanzhou.Secondly,the effect of planning coping strategies is proven by calculus.According to the model evaluation results,the high,medium and low model levels are classified,and the corresponding planning response methods are proposed according to the different characteristics of different models.On the basis of the pattern and feature identification in the previous article,the SWMM production and confluence simulation empirical study was carried out in key areas,which verified that the use of infrastructure and ecological environment optimization methods can be effective without changing the existing drainage pipe network structure in the current built area.Realize the effects of rain and flood peak cutting and shortening ponding time,so as to effectively reduce the risk level of the city in the process of disasters.The research follows the context of the combination of theoretical framework and macroscopic and microanalysis and proposes targeted planning and design strategies for the construction of the rainwater safety pattern in Quanzhou.The combination of macroscopic "big sponge" and microscopic "small sponge" is adopted to realize scientific response to rain and flood and reduce the threat of rain and flood disasters.The research and analysis ideas to realize the integration of all elements of "hydrological process-material environment-man-made construction".The results show that:(1)The rain and flood safety pattern evaluation and identification method based on the catastrophe science framework can accurately recognize the risk level of regional rain and flood disasters and the space distribution features of disasters;(2)High-risk areas are mainly distributed in mountain valleys and near river banks Lowlying urbanization area,and the urban area of Quanzhou City is also vulnerable to flooding while facing greater risk of waterlogging;(3)Accurate identification of disaster characteristics based on Iso cluster analysis,and separate rain and flood disaster planning based on different risk characteristics Response measures. |
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