Research Of Geological Disaster In Ningxia Based On The Satellite Image Of ”GF-2”

Ningxia is located in the upper and middle Yellow River.In Ningxia,the climate is arid,the natural environment conditions are poor and the economy is underdeveloped.The south of Ningxia is one of the most famous poverty-stricken areas in China.The geological environment of Ningxia is poor.Geological disaster mainly includes collapse,landslide,debris flow,ground collapse,ground fissure,etc.Geological disasters have become important factors block the economic development of Ningxia.In this paper,based on“Geological disaster remote sensing survey based on domestic satellite data”.Based on the“GF-2”remote sensing image,a series of investigations on the geological disasters in Ningxia have been carried out,and the following results are obtained:1.Analyzed the characteristics of remote sensing image of domestic satellite“GF-2”.In terms of geological disasters interpretation,the characteristics of YG-2?ZY-3?Pleiades-1 and Quick Bird remote sensing image date were analyzed and compared.The result showed that the remote sensing image of GF-2 had higher resolution,at the interpretation of the small geological disaster,such as ground collapse and ground cracks,as well as to extract the texture information of geological disasters in detail had more advantages,compared with the high image abroad had a higher cost performance.2.The“GF-2”image obtained from 2015 to 2016 is used as the base map,and the ArcGIS platform is used to interpret the geological disasters in Ningxia by means of human-computer interaction and interpretation.Established the interpretation signs of geological disasters of Ningxia.Interpreting the geological disasters in Ningxia.Through the field verification,the interpretation results were revised and sorted,the types,quantity and distribution characteristics of geological disasters in Ningxia were obtained.As a result,there were 1,177 geological disaster sites,including 654landslides,accounting for 55.56%of the total,277 landslides,accounting for 23.53%of the total,225 landslides,accounting for 19.12%of the total,20 ground collapses,accounting for1.70%of the total,1 ground fissure,accounting for 0.08%of the total.3.Analyzed the relationship of the geological disasters and landform,engineering geological petrofabric,geological structure,earthquake,water system,rainfall and human engineering activities.According to the influence of geological environment on the development of geological disasters,used Analytic Hierarchy Process,have analyzed 10 factors which determine the geological hazards and established a hierarchy model.The weight of each influence factor was calculated.Based on ArcGIS,the evaluation and regionalization of Ningxia geological disasters was carried out.Finally,the geological disasters were found to be high,middle and low prone areas.As the result,the area of high incidence of geological disasters is about4575km~2,accounting for 6.89%of the whole Ningxia.The area of the middle vulnerable area in geological disasters is about 27131km~2,accounting for 40.86%of the total area of Ningxia.The area of low and vulnerable geological disasters is about34694km~2,accounting for 52.25%of the Ningxia.