Ground and Satellite-Based Methods of Measuring Deformation at a UK Landslide Observatory: Comparison and Integration
Ground and Satellite-Based Methods of Measuring Deformation at a UK Landslide Observatory: Comparison and Integration
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DOI：
10.3390/rs14122836
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发表时间：
2022-06
期刊：
影响因子：
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通讯作者：
K. Kelevitz;A. Novellino;A. Watlet;J. Boyd;J. Whiteley;J. Chambers;C. Jordan;T. Wright;A. Hooper;J. Biggs
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文献类型：
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作者：
K. Kelevitz;A. Novellino;A. Watlet;J. Boyd;J. Whiteley;J. Chambers;C. Jordan;T. Wright;A. Hooper;J. Biggs
随着欧空局Sentinel-1干涉合成孔径雷达（干涉合成孔径雷达）使命任务的进展，地球仪各地都可以免费获得遥感地面变形观测数据，从而能够对自然灾害和结构不稳定性进行连续监测。联合王国的数字环境倡议旨在将这些遥感数据纳入预测和减轻联合王国各地灾害的努力中。在本文中，我们提出了一个案例研究的Hollin山滑坡在北约克郡，各种地面的地球物理测量与干涉合成孔径雷达数据进行比较。为了将Sentinel-1数据纳入英国的数字环境，重要的是要了解这些观测的优点和局限性，并对其进行适当的解释。英国地质调查局使用Hollin Hill滑坡观测站（HHLO）来了解滑坡过程，并尝试用于边坡稳定性表征和监测的新技术和方法。2019年7月，安装了六个角反射器，以提高干涉合成孔径雷达测量的一致性。我们使用2015年10月至2019年1月期间获得的Sentinel-1干涉合成孔径雷达数据来研究该滑坡的行为，发现下坡运动的视线分量在下降轨迹中为2.7 mm/年，在上升轨迹中为7.5-7.7 mm/年。干涉合成孔径雷达测量结果还突出了滑坡的季节性特征。在安装六个角反射器后，使用干涉合成孔径雷达数据，我们能够追踪2021年1月发生的山体滑坡的最新运动。这一结果是在协议与其他基于地面的测量，如跟踪桩，和土壤水分数据来自电阻率层析成像。
With the advances of ESA’s Sentinel-1 InSAR (Interferometric Synthetic Aperture Radar) mission, there are freely available remote sensing ground deformation observations all over the globe that allow continuous monitoring of natural hazards and structural instabilities. The Digital Environment initiative in the UK aims to include these remote sensing data in the effort at forecasting and mitigating hazards across the UK. In this paper, we present a case study of the Hollin Hill landslide in North Yorkshire where a variety of ground-based geophysical measurements are available for comparison with InSAR data. To include Sentinel-1 data in the UK’s Digital Environment, it is important to understand the advantages and limitations of these observations and interpret them appropriately. The Hollin Hill landslide observatory (HHLO) is used by the British Geological Survey to understand landslide processes, and to trial new technologies and methodologies for slope stability characterisation and monitoring. In July 2019, six corner reflectors were installed to improve the coherence of the InSAR measurements. We use Sentinel-1 InSAR data acquired between October 2015 and January 2019 to study the behaviour of this landslide, and find that the line-of-sight component of the down-slope movement is 2.7 mm/year in the descending track, and 7.5–7.7 mm/year in the ascending track. The InSAR measurements also highlight the seasonal behaviour of this landslide. Using InSAR data after the installation of the six corner reflectors, we are able to track the most recent movement on the landslide that occurred in January 2021. This result is in agreement with other ground-based measurements such as tracking of pegs, and soil moisture data derived from electrical resistivity tomography.