| The main geological hazards affecting people's lives and property are landslide,collapse and debris flow.Landslide is among the most serious and widespread disaster.In recent years,domestic and foreign scholars have conducted a series of studies on the analysis of regional landslide hazard,and gradually formed a series of complete and scientific evaluation systems:selecting the evaluation index of the evaluation index system,based on GIS platform,using powerful spatial analysis ability of GIS,and combined with mathematical models,quantitative and semi quantitative analysis and regional division are carried out.In this paper,taking the SHI ZI River Basin in Gujiao as the research area,based on remote sensing images,using remote sensing technology and geographic information technology,the landslide information in the study area is extracted.The correlation between the landslides and the influencing factors is discussed and analyzed.The vulnerability assessment and regional division of landslide geological disasters are carried out by using the information quantity method.,specific content is as the follows:(1)The method and process of digital image processing technology are discussed,and the characteristics of landslide in the research area are analyzed.According to the natural environment characteristics and human activities,the research area is divided into three regions,in the up stream,lithology is mainly limestone,the seasonal river is seriously affected,the human activity is weak;in the midstream,lithology is mainly loess,and the coal mine is exploited;in thedownstream,lithology is mainly sandstone and loess,which is most affected by human activities,mainly for roads,villages and coal mining activities.On the basis of the field survey,the typical landslides are selected as the interpretation symbols in three regions.Based on the eCognition software,the landslide body information is extracted by the Supporting Vector Machine.After analysis and processing,43 landslides are obtained.The accuracy of the interpretation results is checked by the confusion matrix,and the accuracy of landslide interpretation is 87.51%.On this basis,a database of landslide hazard distribution is established.(2)The correlation between landslide and various factors is discussed.After analysis and discussion,10 evaluation indexes are selected,such as elevation,slope,aspect,lithology,river,structure,groundwater,road,village and coal mining.Based on this,the index system of vulnerability assessment of landslide disaster is established.(3)The information of each evaluation index is digitized and the database is set up by ARCGIS software.As the basic data of the evaluation,the vulnerability assessment and zoning of the landslide disaster are carried out in the mid and down stream of the SHI ZI river basin with the information quantity algorithm.The evaluation results are divided into 5 areas,which are extremely high prone area,high prone area,medium prone area,low prone area and extremely low prone area.The evaluation results are analyzed and discussed.According to the analysis,the number of landslides in each grade gradually increased with the increase of the level of vulnerability.At the same time,the density of landslides in each grade and the total landslide density in the evaluation area increased gradually,and the number of landslides in the extremely high prone areas and high prone areas accounted for 60.53% of the total.It is shown that the classification of this method is consistent with the actual situation,and the result is ideal.(4)Based on the results of landslide hazard zoning,suggestions for prevention and control are put forward.For example,it is suggested that warning signs should be set near the villages in the extremely prone areas and high prone areas,and the prevention of landslide disaster groups should be strengthened.At the same time,villages affected by coal mining activities should be evacuated. |
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