摘要
地震通常引发山体滑坡造成公路阻断。为精准判定堆积在路面的滑坡体规模,提出基于滑坡体构型特征和激光点云的灾害规模判定方法。首先,分析滑坡体表面和空间特征,总结灾害规模判定方法的约束条件;其次,基于灾害规模判定方法的约束条件,采用Delaunay三角网格将灾害表面剖分并投影至路面形成最小独立单元;最后,建立不同最小独立单元体获取灾害的激光点云积求解模型,最小独立单元根据其特点选择对应模型求解体积并累加。建立理论点云模型和ISPRS点云模型验证所提出方法的正确性与准确性,分析其优缺点。验证结果表明,该方法能够正确解析理论点云模型规模,接近其理论值,误差在0.7%以内;同时,该方法也能准确解析ISPRS点云模型规模,与Compute 2.5D Volume模块的处理结果对比分析,其相对误差在0.7%以内,满足大多工况条件下的灾害规模求解。
Earthquakes usually cause landslides and block roads. In order to accurately determine the scale of landslide mass accumulated on the pavement,a disaster scale determination method based on the configuration characteristics of landslide mass and laser point cloud is proposed. Firstly,the surface and spatial characteristics of landslide are analyzed,and the constraints of disaster scale determination method are summarized. Secondly,based on the constraints of the disaster scale determination method and the laser point cloud of the disaster,the disaster surface is divided and projected onto the pavement by Delaunay triangular mesh to form the minimum independent unit. Finally,the volume solving models of different minimum independent units are established. The minimum independent unit selects the corresponding model according to its characteristics and accumulates the volume. The theoretical point cloud model and ISPRS point cloud model are established to verify the correctness and accuracy of the proposed method,and its advantages and disadvantages are analyzed. The verification results show that this method can correctly analyze the scale of the theoretical point cloud model,close to its theoretical value,and the error is within 0.7%. At the same time,this method can also accurately analyze the scale of ISPRS point cloud model. Compared with the processing results of compute 2.5D volume module,the relative error is less than 0.7%,which meets the solution of disaster scale under most working conditions.
作者
曾维刚
王兵
张继忠
马晨园
ZENG Weigang;WANG Bing;ZHANG Jizhong;MA Chenyuan(Xinjiang University,Urumqi 830000,China)
出处
《自然灾害学报》
CSCD
北大核心
2022年第6期200-209,共10页
Journal of Natural Disasters
基金
新疆维吾尔自治区重大科技专项(2020A03003)
新疆交通运输厅项目(201804071395)。
关键词
地震
滑坡体构型特征
激光点云
Delaunay三角网格剖分
最小独立单元体积求解模型
灾害规模判定方法
earthquake
landslide configuration characteristics
laser point cloud
Delaunay triangular mesh subdivision
the minimum independent element volume solution model
disaster scale determination method
