In order to solve the problems of low efficiency,multiple blind spots,and high risks in traditional debris flow exploration,two technical means were adopted:small baseline subset interferometric synthetic aperture radar(SBAS-InSAR)and unmanned aerial vehicle(UAV)low altitude remote sensing(the former obtains highly reliable deformation of vegetation coverage areas through dense images,while the latter obtains high-resolution realistic 3D models through regional network adjustment and other processing).Integrating deformation and image texture,a survey and analysis of debris flow valleys along a railway in a certain mountainous area was conducted to obtain the spatial and temporal distribution of geological hazards in the watershed.The results show that,through SBAS-InSAR technology,it was found that there were multiple seasonal active hazards in the debris flow valley,with a maximum deformation variable of 28.5 mm/a.Based on the 3D model of UAV,a detailed investigation was conducted on the spatial form,volume,occurrence,and development of the deformation hazard.The largest scale landslide had a volume of 165000 to 180000 cubic meters.On site investigations show that the comprehensive remote sensing technology can effectively overcome the challenges of complex mountainous terrain and difficult access for humans,providing a multidimensional perspective for disaster screening.It has the advantages of low personnel investment,wide monitoring area,fast disaster positioning,and high screening accuracy.
关键词
山区铁路/时序InSAR技术/无人机/实景三维模型/泥石流灾害/滑坡/危岩
Key words
mountain railway/time-series InSAR/UAV/3D realistic model/debris flow disasters/landslide/dangerous rock mass
维普
万方数据