摘要
激光雷达测量(LiDAR)技术是一种先进的主动式遥感测量手段,具备多次回波且成像点云可滤除植被的特点,该技术在几乎无植被覆盖的矿山地质调查、道路巡检等方面有了一定的应用,但在植被覆盖区的地质灾害或地质灾害隐患识别方面的研究还有待进一步深入。针对江苏省山区植被覆盖茂盛、地质灾害隐蔽性强的特点,以宜兴市竹海风景区公路旁一处道路边坡为研究对象,基于无人机机载LiDAR低空测取的高密度激光点云数据,使用Terrasolid的Terrascan模块进行滤波处理,得到剥离植被后的地面点云,进而利用Arcgis10.6生成DEM、等高线图和一系列数字地形分析图件,并据此分析和解译出该边坡区一处隐蔽滑坡的各种地表参数信息。结果表明:该滑坡体平面上呈现典型的圈椅状地貌,面积为930 m^(2),长为91 m,宽为19 m,平均地表坡度为35°,滑坡体主滑方向为南偏西6°,为公路切坡诱发的小型土质滑坡;滑坡体的滑坡前、后缘高差为10.1 m,滑坡后壁高差为1.9~3.1 m,中部滑坡台阶宽度为3.5~6.2 m。该研究不仅总结出一套针对植被覆盖区小型地质灾害进行机载激光雷达快速识别的技术流程,同时也为植被茂密区相对隐蔽地质灾害隐患的调查及防灾减灾提供了思路。
LiDAR(Light Detection And Ranging)is an advanced active remote sensing measurement me-thod which has the characteristics of multiple echoes and the function of vegetation filtration.There are some researches on mine geological survey and road inspection with almost no vegetation cover.However,the research on the identification of geological hazards or potential geological hazards in vegetation-covered areas needs to be further deepened.Taking a road slope in Zhuhai Scenic Area in Yixing City,Jiangsu Pro-vince as the research object,with the high density laser point cloud data obtained by UAV airborne LIDAR,this paper uses the TerraScan in Terrasolid to filter and remove vegetation to generate ground point cloud.Then the paper creates the DEM,contour map and a series of digital topographic analysis maps using ArcGIS 10.6,and through the analysis,the paper interprets the surface parameter information of a hidden landslide in the slope area.The results show that the landslide presents a typical armchair landform on the plane,with an area of 930 m^(2),a length of 91 m,a width of 19 m and an average slope of 35°.The landslide slide is 6°south by west,which is a small soil landslide induced by highway slope cutting.In addition,according to the profile,it can be seen that the height difference between the front and rear edge of the landslide is 10.1 m,the height difference of the landslide back wall is 1.9-3.1 m,and the width of the steps in the middle of the landslide is 3.5-6.2 m.The paper not only summarizes a set of technical process for airborne LiDAR rapid identification of small geological hazards in vegetation-covered areas,but also provides a refe-rence for the investigation and disaster prevention and mitigation of relatively hidden geological ha-zards in vegetation-covered areas.
作者
彭艺伟
董琦
田冲
陈刚
孟小军
曾斌
PENG Yiwei;DONG Qi;TIAN Chong;CHEN Gang;MENG Xiaojun;ZENG Bin(School of Environmental Studies,China University of Geosciences(Wuhan),Wuhan 430078,China;Zhejiang Jiuhe Geological Ecological Environment Planning and Design Co.,Ltd.,Huzhou 313002,China;Geological Survey of Jiangsu Province,Nanjing 210018,Cina)
出处
《安全与环境工程》
CAS
CSCD
北大核心
2021年第6期100-108,共9页
Safety and Environmental Engineering
基金
江苏省地质勘查专项基金项目(苏财建[2018]96号、苏财资环[2019]14号)。
关键词
机载LiDAR技术
植被覆盖区
地质灾害识别
激光点云处理
植被滤除
数字地形分析
airborne LiDAR
vegetation cover area
geological hazard identification
laser point cloud processing
vegetation filtration
digital terrain analysis
作者简介
彭艺伟(1997-),男,硕士研究生,主要研究方向为地质灾害识别。E-mail:714367346@qq.com;通讯作者:曾斌(1980-),男,博士,副教授,主要从事地质灾害(隐患)的调查(早期识别)、评价、监测、防控等方面的教学和研究工作,Email:zengbin@cug.edu.cn。
