The influence of the landscape pattern on urban waterlogging in Karst mountains——Take Guiyang as an example
With the influence of global climate change and rapid development of urbanization,urban waterlogging has occurred frequently,and has become one of the disasters that cause serious losses in Karst areas.In this study,Guiyang,a Karst mountainous city in Southwest China,was selected as the study area.Based on the observed and investigated waterlogging disaster data in the study area from 2016 to 2020,spatial autocorrelation analysis and correlation analysis methods were used to explore the impact of urban landscape pattern on urban waterlogging.The results showed that:1)From 2016 to 2020,the waterlogging occurred frequently in the main urban area of Guiyang,and its spatial distribu-tion difference was significant;the waterlogging points showed significant spatial autocorrelation and concentration distribution pattern.2)Impervious surface and vegetation had significant correlation with the frequency of waterlogging,which showed positive and negative correlation respectively.3)The landscape inside the 500 m buffer zone around the waterlogging point was composed of a few patches with a high degree of aggregation,and the dominance value was high.There was only one or a few dom-inant types;the spatial clustering of landscape patterns of different land use types was significantly dif-ferent,among which the landscape index of railway,road and housing construction was relatively more significant.4)The relationship between waterlogging and land use area was not significant,but there was a significant correlation between waterlogging and land use landscape index.This study will provide an important reference for the prevention and control of waterlogging and the planning and management of landscape pattern in Karst cities.
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