川藏高山峡谷区线性工程地质灾害综合遥感早期识别研究--以巴塘-芒康段为例

The Batang-Mangkang section of the G4218 highway is located in the transition zone from the Jinsha River valley to the plateau,where the neotectonic activity is strong, the rock mass is broken, and the problem of geological disasters is very serious,so the construction and maintenance of the section are faced with huge difficulties. Traditional ground geological survey methods are faced with many difficulties in route selection and evaluation of disasters, so they cannot provide a reasonable theoretical basis for the planning and construction of linear engineering. The combination of optical remote sensing and InSAR is expected to efficiently and accurately investigate geological hazards and reveal development rules of hazards, so as to provide a geological basis for possible construction problems. Based on the special geological conditions in the alpine gorge area of qinghai-tibet plateau, this paper summarizes the common geological disasters in this area, and develops a comprehensive remote sensing identification method for highway based on the remote sensing technology. Using this method to carry out a disaster investigation on the Batang-Mangkang section, fully grasped the use of optical remote sensing and InSAR, supplemented by field geological surveys, GIS spatial analysis, engineering geological analogies, etc., and obtained some Knowledge: (1) The number of geological hazards interpreted by optical visual remote sensing in the region is 670, and the number of geological hazards interpreted by InSAR is 72, and there are a total of 72 geological hazards that may directly adversely affect the line. (2) The development regularities of different types of geological hazards in the region are greatly different due to changes in topography, geological conditions, and geological hazards. The region can be divided into six sections:Jinsha river wide valley sections, Longqu narrow valley sections, and Rirong deep groove section, the Lingzhi river cutting section, the Mengkang gentle section, and the Lawu mountain slope descending section, which provides the geological basis for the adjustment of the default route design; (3) The optical remote sensing interpretation results and InSAR interpretation results are not complete consistent, and they cannot directly check each other; (4) the use of integrated remote sensing is universal in highway construction in the alpine canyon area of the Qinghai-Tibet Plateau. It makes full use of the complementarity of optical remote sensing and InSAR, and has a more comprehensive understanding of the development of regional geological disasters on the basis of saving time and cost.