County Mountain Flood Disaster Risk Assessment And Emergency Sites Spatial Layout Research

In the context of land and space planning,urban security resilience has changed.In the past,it only focused on the central city of key cities,while land and space planning emphasized the understanding of the whole research area.Therefore,the research and analysis of small-scale County Security resilience is particularly important.The results of the analysis can provide guidance and suggestions for the construction of security resilience and the spatial planning of township land.The setting of emergency shelters is also an effective means to enhance the urban safety and resilience.Scientific and reasonable spatial distribution is more obvious for the function of emergency shelters.At the same time,the scientific spatial layout planning can provide a strong guarantee for the life and property safety of the affected residents to a large extent,so that the affected residents can quickly arrive at the nearest emergency shelter in a short time Shelters.This paper mainly studies the risk assessment of mountain torrents and emergency shelters.(1)Select the evaluation index factors and build the evaluation model.Based on the comprehensive analysis of the historical disaster data,terrain and geological conditions of the study area,starting from the natural attributes and social attributes,four levels of index factors are selected,namely,the disaster pregnant factor,the disaster sensitive factor,the vulnerability factor of the disaster bearing body and the disaster prevention and mitigation factor.Then the weight coefficient of each index factor is determined by using the analytic hierarchy process and related literature methods A 10-year and 50 year risk assessment model of mountain torrent disaster in Binzhou City was established.From the 10-year flash flood disaster risk,it can be concluded that the high-risk areas are mainly distributed in Yongle Town and Xinmin Town,accounting for 11.35%of the study area,and the low-risk areas are mainly distributed in Hanjia Town,Shuikou Town and Taiyu Town,due to the low rainstorm intensity,gentle slope and high vegetation coverage.The high-risk areas of 50 year return period mountain flood are mainly distributed in the middle of Yongle Town and Xinmin Town.Compared with the 10-year return period,the high-risk areas gradually slow down,and the low-risk areas gradually transfer to the medium risk areas,mainly in Hanjia town and Longgao town.(2)In addition to the large-scale risk division,on this basis,the small-scale mountain flood hazard zoning is defined.The selected object is Hongyan River Basin in Binzhou City.After the analysis and calculation of the design storm flood,the hazard zoning map of Hongyan River in Binzhou City is drawn in Arc GIS software.This paper selects two different scale evaluation models to conduct a comprehensive and accurate study on the spatial distribution of mountain torrents in Binzhou City from different angles.The two analysis results can provide the basis for the prevention of mountain torrents,support the decision-making of relevant personnel in the emergency management department,and provide scientific basis and guiding significance for the first national comprehensive risk survey of natural disasters.(3)Kaiyuan square is selected as the emergency shelter in the main urban area of Binzhou City to provide emergency shelter services for residents.The service coverage area is small,the coverage population is small,and the service blind area is large.