基于点云数据处理的坡面泥石流形态特征提取

Extraction of Slope-Debris-Flow Morphological Characteristics Using Point Cloud Processing

针对重庆綦江~万盛高速公路边坡在强降雨条件下形成的坡面泥石流,采用消费级无人机航拍生成坡面泥石流点云数据。采用C++编程语言对点云数据进行切片、投影、排序、深度计算、体积计算等操作,提出了基于点云切片提取泥石流各断面侵蚀-堆积极值点平面/剖面分布、侵蚀-堆积体积等地貌特征的方法。结合该研究区进行分析可知,坡面泥石流内部存在侵蚀-堆积优势区域;该坡面泥石流侵蚀-堆积体积与平均侵蚀-堆积深度重合度高,与坡面泥石流宽度大、侵蚀深度浅的特点有关。基于点云数据处理的坡面泥石流形态特征提取方法可从不同角度对地貌特征进行分析,对坡面泥石流侵蚀-堆积关系与其产流-汇流-堆积演化过程研究具有积极意义。

Regarding the debris flow on the slope of Chongqing Qijiang-Wansheng Expressway under heavy rainfall,in this paper the consumer-grade drone aerial photography is used to generate debris flow slope point cloud data.The C+ + programming language is used to slice,project,sort,calculate the depth and volume as well as other operations on point cloud data,a method which can extract the plan/profile distribution of the maximum erosion depth(maximum siltation depth)and the amount of erosion and sedimentation of the debris flow section is proposed.Based on the analysis of this study area,there are erosion-accumulation advantageous areas within the debris flow on the slope;the erosion-accumulation volume of the debris flow on the slope has a high overlap with the average erosion-accumulation depth,which is related to the large width of the debris flow on the slope and the shallow erosion depth.The method for extracting morphological features of slope debris flow based on point cloud data processing can analyze landform features from different perspectives,and has positive significance for the study of slope debris flow erosion-accumulation relationship and its evolution process of runoff-convergenceaccumulation.