The Susceptibility Zoning of Rainfall Type Geological Hazards in Henan Province Based on Erosion Cycle Theory
The topographical pattern of Henan Province,which is surrounded by mountains on three sides,higher eleva-tions in the west and lower elevations in the east,as well as the relatively concentrated rainfall period,make the geological hazards triggered by rainfall erosion in the province have obvious spatial and temporal distribution characteristics.In order to effectively prevent and reduce regional rainfall-type geological disasters,based on the theory of erosion cycle and the su-perentropy model of watershed system stability judgment,the susceptibility of rainfall-type geological disasters in Henan Province were divided by geographic information processing technology.The results are as follows.The areas prone to rain-fall geological disasters are mainly distributed in mountainous and hilly areas of Henan Province.The extremely high and highly prone areas are mainly distributed in the mountainous and hilly areas of the Taihang Mountains in northern Henan,as well as the mountainous and hilly areas of Xiao Mountains,Xiong'er Mountains,Funiu Mountains,Song Mountains,and Waifang Mountains in western Henan,as well as the mountainous and hilly areas of Tongbai Mountains and Dabie Mountains in southern Henan.The intermediate-prone areas are not as widely distributed in the Xiao Mountains and Dabie Mountains,but scattered in other mountain regions,and are relatively concentrated around the Nanyang Basin.The low-prone areas are more distributed in the Yi River,Luo River and Beiru River basin,but few in other mountainous areas.Be-fore 2019,among the 4 899 geological disasters that had occurred in Henan Province,a total of 4 575 disaster sites were distributed in the different geological disaster-prone zones classified in the paper.Among them,63.23％of the total disas-ter sites were in the areas of extremely high risk,34.29％were in the areas of high risk and medium risk,and 2.48％were in the areas of low risk.The results of susceptibility zoning are highly consistent with the spatial distribution of geological hazards,indicating that the evaluation zoning results of rainfall type geological hazards using super entropy values are con-sistent with the actual situation and can be applied to guide regional disaster prevention and reduction.
erosion cyclesuper entropyrainfall type geological hazardssusceptibility zoning
万方数据
维普
