| The large-scale mining of mineral resources has caused frequent geological disasters such as land subsidence,ground subsidence,ground fissures,and mountain collapses.At the same time,it has also led to ecological and environmental problems such as the destruction of the ground cover,the destruction of cultivated land,and the pollution of surface water,which seriously threatens people’s lives and health.Property security.Quickly obtain the spatial distribution and types of hidden dangers of geological disasters in mining areas,and establish a scientific evaluation method for the susceptibility of geological disasters,which has important theoretical significance and practical value for the prediction,early warning and prevention of geological disasters.In this paper,Heshan District and Shancheng District of Hebi City are used as the research areas,Sentinel-1A time series images are used as the data source,and time series SBAS-InSAR technology and PS-InSAR technology are used to carry out interferometric measurements on different types of targets on the surface respectively,and obtain the surface deformation information of the study area from January 2019 to August 2021,and identify potential geological hazards by combining geological survey data and Google Earth image data;The weights of evaluation factors are determined by the improved Analytic Hierarchy Process(AHP),and a susceptibility evaluation index system based on the improved AHP-comprehensive evaluation method is constructed.The main research contents of this paper are as follows:(1)In view of the complex types of ground objects in the study area(Such as construction land,roads,cultivated land,forest land,water systems,etc.),this paper uses PS-InSAR technology to perform interference processing on construction land,roads and other ground objects that are easy to establish corner reflectors.For land objects such as forest land and cultivated land,deformation information was extracted by SBAS-InSAR technology,and the surface deformation information of the study area from January 2019 to August 2021 was obtained.The analysis of the surface subsidence results shows that the surface subsidence of the study area is mainly distributed in the central area,and the subsidence in the eastern area is not obvious;There are 6 areas with obvious subsidence,the maximum subsidence rate is-165mm/a,and the maximum accumulated subsidence is-324mm。(2)The extracted information on important features such as residential areas,water systems,and roads is superimposed with high-resolution images,and the corresponding deformation threshold is set according to the average annual deformation rate of the features.Based on this,the hidden geological disaster areas screened are: There were 64 ground subsidences,1 ground fissure,and 3 ground collapses.(3)Nine factors including average surface deformation rate,surface cumulative deformation,ground collapse,ground fissures,slope,slope aspect,NDVI,distance to mining range,and distance to residential areas are selected as the influencing factors for geological hazard evaluation,and the improved AHP and comprehensive evaluation are adopted.The combined method determines the weight value of each evaluation factor,establishes the evaluation index system of geological disaster susceptibility,and draws the following conclusions: The high-prone areas of geological disasters are mainly distributed in the middle of the study area,almost all within the scope of mining rights,accounting for 25.01% of the area;the eastern area is dominated by medium-prone areas,accounting for 39.84% of the study area,while the vast majority of the western area low susceptibility area.There are 43 figures,10 tables,and 69 references in this thesis. |
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