A linked geomorphological and geophysical modelling methodology applied to an active landslide

Boyd, Jimmy and Chambers, Jonathan and Wilkinson, Paul and Peppa, Maria and Kirkham, Matthew and Jones, Lee and Watlet, Arnaud and Swift, Russel and Meldrum, Philip and Uhlemann, Sebastian and Binley, Andrew (2021) A linked geomorphological and geophysical modelling methodology applied to an active landslide. Landslides. ISSN 1612-5118

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Moisture-induced landslides are a global geohazard; mitigating the risk posed by landslides requires an understanding of the hydrological and geological conditions present within a given slope. Recently, numerous geophysical studies have been attempted to characterise slow moving landslides, with an emphasis on developing geoelectrical methods as a hydrological monitoring tool. However, landslides pose specific challenges for processing geoelectrical data in long-term monitoring contexts as the sensor arrays can move with slope movements. Here we present an approach for processing long-term (over 8 years) geoelectrical monitoring data from an active slow moving landslide, Hollin Hill, situated in Lias rocks in the southern Howardian Hills, UK. These slope movements distorted the initial setup of the monitoring array and need to be incorporated into a time-lapse resistivity processing workflow to avoid imaging artefacts. We retrospectively sourced seven digital terrain models to inform the topography of our imaging volumes, which were acquired by either Unmanned Aerial Vehicle (UAV)-based photogrammetry or terrestrial laser ranging systems. An irregular grid of wooden pegs was periodically surveyed with a global position system, from which distortions to the terrain model and electrode positions can be modelled with thin plate splines. In order to effectively model the time-series electrical resistivity images, a baseline constraint is applied within the inversion scheme; the result of the study is a time-lapse series of resistivity volumes which also incorporate slope movements. The workflow presented here should be adaptable for other studies focused on geophysical/geotechnical monitoring of unstable slopes.

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?? geophysicslandslidegeotechnical engineering and engineering geology ??
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26 Apr 2021 12:10
Last Modified:
15 Jul 2024 21:36