Measuring ground surface elevation changes in a slow-moving colluvial landslide using combinations of regional airborne lidar, UAV lidar, and UAV photogrammetric surveys

IF 1.3 4区 工程技术 Q3 ENGINEERING, GEOLOGICAL Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-02-16 DOI:10.1144/qjegh2022-078
S. Johnson, W. Haneberg, L. Bryson, M. Crawford
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Abstract

Slow-moving, chronically destructive landslides are projected to grow in number globally in response to precipitation increases from climate change, and land disturbances from wildfire, mining, and construction. In the Cincinnati and northern Kentucky metropolitan area, USA, landslides develop in colluvium that covers the steep slopes along the Ohio River and its tributaries. Here we quantify elevation changes in a slow-moving colluvial landslide over 14 years using county-wide lidar, uncrewed aerial vehicle (UAV) structure from motion (SfM) surveys, and a UAV lidar survey. Because the technology and quality differ among surveys, the challenge was to calculate a threshold of detectable change for each survey combination. We introduce two methods, the first uses propagated elevation difference errors, and the second back-calculates the individual survey errors. Thresholds of detection range from ± 0.05 to ± 0.20 m. Record rainfall in 2011 produced the largest vertical changes. Since then, the landslide toe has continued to deform, and the landslide has doubled its width by extending into a previously undisturbed slope. While this study presents a technique to utilize older datasets in combination with modern surveys to monitor slow-moving landslides, it is broadly applicable to other studies where topographic data of differing quality is available.
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结合区域机载激光雷达、无人机激光雷达和无人机摄影测量测量缓慢移动的滑坡地表高程变化
由于气候变化导致的降雨量增加,以及野火、采矿和建筑造成的土地干扰,预计全球缓慢移动、长期破坏性的山体滑坡数量将增加。在美国辛辛那提和肯塔基州北部的大都市地区,山体滑坡在覆盖俄亥俄河及其支流陡坡的崩积层中发展。在这里,我们使用全县范围的激光雷达、无人机运动结构(SfM)调查和无人机激光雷达调查,量化了14年来缓慢移动的崩坡积滑坡的高程变化。由于不同调查的技术和质量不同,因此面临的挑战是计算每个调查组合的可检测变化阈值。我们介绍了两种方法,第一种方法使用传播的高程差误差,第二种方法反算个别测量误差。检测阈值范围从±0.05到±0.20米。2011年创纪录的降雨量产生了最大的垂直变化。从那时起,滑坡坡脚继续变形,滑坡延伸到以前未受干扰的斜坡中,宽度增加了一倍。虽然这项研究提出了一种利用旧数据集与现代调查相结合来监测缓慢移动的滑坡的技术,但它广泛适用于其他具有不同质量地形数据的研究。
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来源期刊
CiteScore
3.40
自引率
14.30%
发文量
66
审稿时长
6 months
期刊介绍: Quarterly Journal of Engineering Geology and Hydrogeology is owned by the Geological Society of London and published by the Geological Society Publishing House. Quarterly Journal of Engineering Geology & Hydrogeology (QJEGH) is an established peer reviewed international journal featuring papers on geology as applied to civil engineering mining practice and water resources. Papers are invited from, and about, all areas of the world on engineering geology and hydrogeology topics. This includes but is not limited to: applied geophysics, engineering geomorphology, environmental geology, hydrogeology, groundwater quality, ground source heat, contaminated land, waste management, land use planning, geotechnics, rock mechanics, geomaterials and geological hazards. The journal publishes the prestigious Glossop and Ineson lectures, research papers, case studies, review articles, technical notes, photographic features, thematic sets, discussion papers, editorial opinion and book reviews.
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