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Potential use of APSIS-InSAR measures of the range of vertical surface motion to improve hazard assessment of peat landslides

Islam, Md Tariqul; Bradley, Andrew V.; Sowter, Andrew; Andersen, Roxane; Marshall, Chris; Long, Mike; Bourke, Mary C; Connolly, John; Large, David J.

Potential use of APSIS-InSAR measures of the range of vertical surface motion to improve hazard assessment of peat landslides Thumbnail


Authors

Md Tariqul Islam

Andrew Sowter

Roxane Andersen

Chris Marshall

Mike Long

Mary C Bourke

John Connolly

DAVID LARGE David.Large@nottingham.ac.uk
Abbott Professor of Geoscience



Abstract

Peat landslides represent a notable natural hazard that is difficult to assess across complex blanket bog terrain. To aid the assessment of peat landslide susceptibility, we propose a new metric, the range of vertical surface motion (RVSM), quantified from time series data of surface motion measured using interferometric synthetic aperture radar (InSAR). Our expectation is that areas that are more susceptible to landslide will display a high RVSM that is indicative of high amplitude swelling and shrinking of the peat in response to changes in the volume of water stored in the peat over time. To test our hypothesis we examined the spatial distribution of high RVSM values that preceded three peat landslides in Ireland in 2020 and over a large area of blanket bog. We observed that high RVSM was closely associated with the known failures and with inferred points of initial failure, and that the areas of high RVSM were detectable up to two years in advance of failure. In the blanket bog landscape, high RVSM was associated with areas where landscape hydrology would favour thick peat and subsequent potential instability. We conclude that RVSM mapping has potential for refining national-scale assessments of peat landslide susceptibility.

Journal Article Type Article
Acceptance Date Jul 5, 2022
Online Publication Date Jul 17, 2022
Publication Date Jul 17, 2022
Deposit Date Jul 21, 2022
Publicly Available Date Jul 21, 2022
Journal Mires and Peat
Print ISSN 1819-754X
Electronic ISSN 1819-754X
Peer Reviewed Peer Reviewed
Volume 28
Article Number 21
DOI https://doi.org/10.19189/MaP.2021.OMB.StA.2356
Keywords bog breathing; Ireland; Meenbog; Mount Eagle; remote sensing; RVSM; Shass Mountain
Public URL https://nottingham-repository.worktribe.com/output/9091248
Publisher URL http://mires-and-peat.net/pages/volumes/map28/map2821.php

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