Identification And Information Extraction Of Glacier Debris Flow Disaster Based On Radar Remote Sensing

Sichuan-Tibet Highway is the connecting way between Tibet and the Mainland,which has great strategic significance to the political stability,economic development and national security of Tibetan areas.Along the Sichuan-Tibet highway,the geological structure is complicated,the plate activity is violent,the mountain slope is steep,the rock is broken,and the ice and snow are covered widely.Not only resulting in the collapse of the landslides,landslides,sand slopes,debris flow disaster is extremely developed,but also forming the unique glacier debris flow in alpine mountain,which caused the greatest harm,and seriously affected the road and people's lives and property safety,restricting local economic development.it is difficult to achieve a wide range of field detailed census cause the terrain conditions and special climate in highland mountain,rapidly and the advantages of a wide range of investigation make remote sensing technology the preferred means of glacier debris flow survey,Based on the field investigation,this paper combines the radar remote sensing images and extracts the texture features,constructs the rules of glacier debris flow identification,and constructs the glacier debris flow information extraction model by principal component analysis.Using radar data of 2015 extracts the information of the glacier debris along the Ranwu-Lulang section of Sichuan-Tibet Highway,and the accuracy was verified by field investigation data.The main achievements and understanding of this paper are as follows:1)Using db wavelet transform to fuse the homologous lift rail SAR image.It's better to eliminate the fusion image after the cover effect,weaken part of the shadow,highlighting the image texture information.Which solves the shadow and concealment effect of SAR image in alpine mountainous area due to terrain ups and downs.2)The rule of glacier debris flow is established based on SAR image,and the glacier debris flow identification based on SAR image gray scale and texture feature statistics is completed.3)Established the glacial debris flow SMI extraction model through Comprehensive texture feature statistics and slope factor..Based on the rules of identification,the object-oriented method was used to extract the debris flow from the Ranwu-Lulang section of Sichuan-Tibet Highway,and the precision was 86.5% with the field investigation data.4)The vertical deformation of the Sichuan-Tibet Highway along the vertical deformation of the Sichuan-Tibet Highway is extracted by the offset estimation technique.The deformation results of the period from February to October 2015 are obtained.The results show that the monitoring and field conditions are more Meet,can better reflect the channel ice and snow,winter weather and other sources of material changes.Before the occurrence of debris flow,the source of the slope on both sides of the slope in the ice and snow gravity,runoff erosion,under the influence of ice avalanche,gradually migrate to the ditch bed near.During the period of debris flow,there is a large area of sedimentation and accumulation in the channel,and the main ditch and branch groove of the basin have a large negative value.