| Panzhihua,Sichuan province is an important mining city in southwestern Sichuan.Vanadium and titanium magnetite is more abundant in this area.There are large and medium-sized mining areas such as Ma’anshan,Zhong Liang Zi,Zhong Gan Gou,Xiushui River and red grid.The city has complicated geological environment and changeable climate.It has the characteristics of large area,frequent outbreak and long duration.The"8.30"earthquake is the best proof for the bad geological environment in Panzhihua.In view of the whole area of Panzhihua,landslides,landslides and debris flows still occupy a major part,accounting for about 59%of all disasters.As of December 2017,more than 130 large-scale landslides had occurred in the area,resulting in more than 50 debris flow gullies.According to statistics,the largest landslide volume is as high as 400 x 10~4m~3,and the largest collapse is 4000m~3.The innovation point of this study is to combine mining development with geological disasters in this unique mining city in Panzhihua.In the context of landslides,landslides,debris flows and other geological disasters in Panzhihua,this paper puts forward the precautions and rectification measures of mine mining,and studies the geological disasters suitable for the region in the same time.Danger distribution map contributes to local economic development,people’s life and safety.In panzhihua river basin Zha-the ground of the area as the research object,the reference field screening the data in the study area and the key area of remote sensing data research,master the release characteristics of geological disasters in the studied area and distribution,using GIS tools and analytical methods,do risk assessment in the studied area.In the end,the panzhihua,which is divided into high,middle and low danger zones,can be divided into three levels.The main research contents are as follows:(1)103 geological hazards are interpreted in detail through 1:1 million Ple iades-1A image data from the Panzhihua Dahe River Basin,including 28 debris flows,33 landslides and 42 landslides.(2)to investigate the field data,to understand the background conditions of geological disasters,and to use remote sensing technology to carry out a more in-depth analysis,and to interpret the types and distribution of the surface cover of the mining area in detail,and provide the basic information for the comprehensive analysis and study of the formation conditions and influencing factors of geological disasters.(3)according to the analysis of geological hazard formation conditions,several factors are calculated by mathematical model,and the slope,slope height,slope direction,engineering rock group and other disaster factors are further determined.The relationship between the distribution of geological hazards and the relative factors in the area is detailed and analyzed with GIS software,and the grey correlation degree method is also used to make sure.The weight of each factor is determined.At last,the Arcgis grid(raster)calculator is used to superimposition,and the geological hazard risk assessment map is completed,and the evaluation results are analyzed.(4)the results of this study show that the distribution of hazardous areas and disaster sites in the study area is consistent with the logic,and the accuracy of the model and factors selected in this evaluation is verified.(5)on the basis of the completion of the zoning map,the rectification measures are proposed for the special geological disasters in the area,so as to contribute to the safety of the local people in the disaster control level of the region. |
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