Study On The Spatial Pattern Of Flood Resilience In Typical Ancient Towns In The Yellow River Plain

Since ancient times,frequent breaches,flooding,diversion of the lower reaches of the Yellow River and the resulting siltation have brought great adverse effects on the overall living space of the Yellow floodplain.Ancient towns and cities on the Yellow floodplain have produced experience in water control containing traditional wisdom in the process of long-term struggle against Yellow River floods and sand disasters.The ability of cities and towns to return to normal life after a flood,known as "flood resilience",is increasing.Since the reform and opening up,with the continuous expansion and development of the urban scale,the flooding problem in the ancient urban area of the Huangpan Plain has evolved from "Yellow River flooding and carrying a large amount of sediment" in the past to "urban drainage obstacles under extreme rainstorm weather".In the face of such a situation,the spatial model of flood and flood resilience of typical ancient urban areas in the Huangpan Plain is studied.It is not only the historical sorting of the ancient urban water control process in the Huangpan Plain,but also has important significance for the reconstruction of the contemporary urban flood resilience spatial system in the future.This paper selects ancient towns in Huangpan Plain as the research object,takes "7.20 Zhengzhou Heavy rainstorm Event" as the realistic problem entry point,uses GIS GIS,mike21 hydrodynamic model and other technical means to extract sample points of ancient towns with different disaster degrees based on the inundation range and depth during heavy rainfall in Zhengzhou.The flood control resilience of ancient towns and cities spatial pattern in Huangpan Plain is verified.Based on the records of local records and historical images,the spatial pattern changes of ancient and modern cities and towns are compared and analyzed,and the spatial circle structure,multi-layer structure and other structural models of typical ancient cities and towns in the Yellow Pan Plain are extracted and summarized.Six cases of Shangqiu,Xiayi,Yucheng,Liaocheng and Huaiyang Dangshan were selected to analyze the spatial model of flood resilience of Cheng-lake circular structure.Heze and Shanxian are selected as the spatial models of flood resilience of the ringed layer structure of the city river.Suixian and Xuzhou are selected as the examples of multi-layer structure,and Donga and Sizhou are taken as other structural models of the yellow pan Plain.By calculating the proportional relationship between the area of ancient towns and the area of urban water system,and the proportional relationship between the axis length of ancient towns and the axis length of urban water system,combined with the disaster degree of ancient towns in Huangpan Plain,this paper takes it as the technical evaluation index of flood resilience space of ancient towns in Huangpan Plain.Finally,based on the regional characteristics and development direction of contemporary cities and towns,this paper puts forward the ways and practical suggestions of integrating traditional water control experience into the reconstruction of urban flood resilience spatial system.