Research On Debris Flow Accumulation Measurement Method Based On UAV Tilt Photography

Plateau is the debris flow,landslide,collapse and other geological disasters areas,in geological hazard investigation,the traditional artificial ground investigation method,it effectively in recent years,sloping photogrammetry technology rapid development,through the tilted uav photogrammetry can be efficient,real-time and accurate to obtain the image in the study area and the surface model.In order to provide a reference scheme for the volume calculation of debris flow accumulation area,the deformation monitoring of diversion groove and the protective construction of surrounding facilities,this paper carried out the following work:(1)The development status of UAV tilt photogrammetry technology at home and abroad,research status of earthwork measurement,UAV tilt photogrammetry system and image acquisition process are introduced in detail,and the principle of three-dimensional model is studied and analyzed.(2)Several groups of 3D models were constructed,and the accuracy of the model was studied and analyzed by using the control variable method.The influencing factors of the accuracy of the 3D model were analyzed mainly from the two aspects of the number of control points and the flight height.Meanwhile,the accuracy of the volume of the mountain auditorium was verified and analyzed by using DEM method.The results show that the error of the 3D model meets the requirements of the code,and the accuracy of the ground object volume calculation also meets the requirements.Moreover,the 3D model has high timeliness and flexible operation,and has important practical value in engineering.(3)On the premise of the 3D model construction method of UAV tilt photogrammetry,the best modeling scheme studied was applied to the actual project of volume calculation of debris flow accumulation area in Bailonggou.To solve the accumulation zone of grooves that residual volume calculation problem,which forced grooves for the further design and protection of dragon ditch bridge pier provide solutions,the results show that the tilt images captured by the tilt uav photogrammetry can establish a three-dimensional model of high precision,and can be applied to debris flow accumulation zone volume calculation and grooves that deformation monitoring.