倾斜摄影在高海拔地区泥石流勘查中的应用

Application of Oblique Photography in Debris Flow Exploration in High-altitude Areas

采用倾斜摄影构建实景三维模型进行泥石流勘查具有成本低、效率高、获取数据精准等优点。在中巴公路(G314)泥石流勘查项目中,采用无人机对泥石流隐患点进行倾斜摄影测量,通过建模软件建立测区实景三维模型,解译并提取该泥石流宏观特征参数,分析计算出泥石流流域面积,主沟道、支沟的长度和纵坡降等易发性评价影响因子。最后结合地面调查得出,该泥石流易发性得分为113分,易发性程度为易发,发展阶段为活跃期,其危害性等级为小型。结果表明,无人机倾斜摄影用于高海拔地区泥石流勘查是可行的,获取的各种信息数据全面、科学合理,能节约成本、提高工作效率。

The use of oblique photography to construct a real 3D model for debris flow exploration has the advantages of low cost,high efficiency,and accurate data acquisition.In the debris flow exploration project of China-Pakistan Highway(G314),drones were used to conduct oblique photogrammetry of hidden debris flow points,and a 3D model of the survey area is established by modeling software,and the macroscopic characteristic parameters of the debris flow are interpreted and extracted.Slope and other susceptibility evaluation factors are also studied in this paper.Finally,combined with the ground investigation,it is concluded that the susceptibility score of the debris flow is 113 points,the susceptibility level is high,the development stage is the active stage,and its hazard level is low.The results show that it is feasible to use UAV oblique photography for debris flow exploration in high-altitude areas,and the obtained various information data is comprehensive,scientific and reasonable,which can save costs and improve work efficiency.