结合站式及手持三维激光扫描仪的侵蚀沟形态参数提取  

Morphological parameter extraction of eroded gully combining stationary and handheld 3D laser scanners

作　　者：李继峰[1,2,3] 王飞翔 余磊 傅学庆 郑东博[1,2,3] 李帅 LI Jifeng;WANG Feixiang;YU Lei;FU Xueqing;ZHENG Dongbo;LI Shuai(School of Geographic Sciences,Hebei Normal University,050024,Shijiazhuang,China;Hebei Technology Innovation Center for Remote Sensing Identification of Environmental Change,050024,Shijiazhuang,China;Hebei Key Laboratory of Environmental Change and Ecological Construction,050024,Shijiazhuang,China)

机构地区：[1]河北师范大学地理科学学院,石家庄050024 [2]河北省环境变化遥感识别技术创新中心,石家庄050024 [3]河北省环境演变与生态建设重点实验室,石家庄050024

出　　处：《中国水土保持科学》2025年第2期210-219,共10页Science of Soil and Water Conservation

基　　金：国家自然科学基金青年项目“土壤风蚀抗蚀性与抗剪强度研究”(41901001);河北省高等教育教学改革研究项目“基于移动教学平台的地理野外实习模式改革与实践”(2019GJJG140)。

摘　　要：准确测量及精确表达侵蚀沟形态是科学评价其发育特征的关键,数字高程模型(DEM)是表达侵蚀沟形态的主要数据模型。利用站式及手持三维激光扫描仪对内蒙古自治区锡林郭勒盟地区的侵蚀沟细部及其所在小流域进行测量,将小流域点云数据和侵蚀沟细部点云数据进行拼接,对比不同空间插值方法及不同空间分辨率DEM的精度,评价不同DEM提取的小流域地形特征参数、侵蚀沟形态参数及地形临界模型参数。结果表明:1)结合站式及手持三维激光扫描仪的点云数据可弥补单一设备采集数据的不足,有效表达侵蚀沟小流域地形及侵蚀沟形态特征;2)针对低缓丘陵区,随DEM分辨率提高,样条函数插值法可获取更高精度的DEM数据;3)对于小流域尺度的侵蚀沟研究,DEM空间分辨率达到0.5 m时,提取的地形因子及侵蚀沟形态参数趋于稳定且与实测侵蚀沟形态参数较为接近;4)根据地形临界模型拟合参数,0.5和1 m分辨率DEM评价地形因子对侵蚀沟影响程度的结果接近,DEM分辨率的提高会增强地形因子对侵蚀沟影响的评价。因此,在较小尺度侵蚀沟研究中,应充分考虑DEM插值方法及分辨率对侵蚀沟形态参数的影响。[Background]The morphological characteristics of eroded gully are key parameters for understanding the occurrence and development of gully erosion,which is of great significance for a deeper understanding of the formation process and governance work of eroded gully.The mathematical mechanism and applicable conditions of different spatial interpolation methods lead to the difference in the accuracy of DEM(digital elevation model)production,which affect the extraction of the terrain characteristic parameters(TCP)of sub-watersheds and the morphology parameters(MP)of eroded gully,and thus affect the accurate monitoring and prediction of the eroded gully.In view of this,this study aims to compare the differences TCP of sub-watersheds,the MP of eroded gully and the critical topographic parameters(CTP)of gully erosion model extracted from in different interpolation methods and different resolution DEMs.[Methods]The eroded gullies and sub-watersheds in the Xilingol League area of Inner Mongolia autonomous region were chosen as the study area.Riegl VZ-1000 stationary laser scanner was placed at the foot of the slope in the study area to collect point cloud data of the sub-watersheds topography.GEO-SLAM ZEB-REVO handheld laser scanner was used to collect the detailed point cloud data of the eroded gullies morphology.Inverse distance weighting,Kriging,natural neighborhood and spline interpolation methods were used to generate DEMs for the fused multi-source point cloud data with the DEM spatial resolutions of 5,2,1,0.5 and 0.1 m respectively.Then the accuracy of different DEMs were evaluated,the TCP of sub-watersheds,the MP of eroded gullies and the CTP of gully erosion model extracted from different resolution DEMs were compared.[Results]1)By comparing parameters such as absolute value of average elevation difference(δ_(1)),average deviation of elevation(δ_(2))and maximum deviation of single point elevation(δ_(3)),the accuracy of DEM generated by spline and Kriging interpolation methods significantly improves with the i

关 键 词：三维激光扫描 点云数据 数字高程模型 空间分辨率 侵蚀沟 

分 类 号：S157[农业科学—土壤学] P931.1[农业科学—农业基础科学]