Hydrogeological and geophysical properties of the very-slow-moving ripley landslide, Thompson river valley, British Columbia

David Huntley*, Jessica Holmes, Peter Bobrowsky, Jonathan Chambers, Philip Meldrum, Paul Wilkinson, Shane Donohue, David Elwood, Kelvin Sattler, Michael Hendry, Renato Macciotta, Nicholas J. Roberts

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Landslides along a 10 km reach of Thompson River south of Ashcroft, British Columbia, have repeatedly damaged vital railway infrastructure, while also placing public safety, the environment, natural resources, and cultural heritage features at risk. Government agencies, universities, and the railway industry are focusing research efforts on a representative test site — the very-slow-moving Ripley Landslide — to manage better the geohazard risk in this corridor. We characterize the landslide’s form and function through hydrogeological and geophysical mapping. Field mapping and exploratory drilling distinguish 10 hydrogeological units in surficial deposits and fractured bedrock. Electrical resistivity tomography, frequency domain electromagnetic conductivity measurements, ground-penetrating radar, seismic pressure wave refraction, and multispectral analysis of shear waves; in conjunction with downhole measurement of natural gamma radiation, induction conductivity, and magnetic susceptibility provide a detailed, static picture of soil moisture and groundwater conditions within the hydrogeological units. Differences in electrical resistivity of the units reflect a combination of hydrogeological characteristics and climatic factors, namely temperature and precipitation. Resistive earth materials include dry glaciofluvial outwash and non-fractured bedrock; whereas glaciolacustrine clay and silt, water-bearing fractured bedrock, and periodically saturated subglacial till and outwash are conductive. Dynamic, continuous real-time monitoring of electrical resistivity, now underway, will help characterize water-flow paths, and possible relationships to independently monitor pore pressures and slope creep. These new hydrogeological and geophysical data sets enhance understanding of the composition and internal structure of this landslide and provide important context to interpret multiyear slope stability monitoring ongoing in the valley.

Original languageEnglish
Pages (from-to)1371-1391
Number of pages21
JournalCanadian Journal of Earth Sciences
Volume57
Issue number12
Early online date20 Aug 2020
DOIs
Publication statusPublished - Dec 2020

Bibliographical note

Funding Information:
Research was undertaken as part of the International Consortium on Landslides (ICL) International Programme on Landslides (IPL) Project 202 (www.iplhq.org). Activities at this site have led to World Centre of Excellence on landslide disaster reduction recognition for both the Geological Survey of Canada and the University of Alberta. Research was funded by Transport Canada and Natural Resources Canada. For their geophysical services, we thank Neil Parry, Megan Caston, Cassandra Budd, and Gordon Brasnett (EBA-TetraTech, Edmonton, Alberta; 2013–2014); Paul Bauman, Landon Woods, and Kimberly Hume (Advisian, Worley Parsons Group, Calgary, Alberta; 2014–2015); Cliff Candy, Larry Theriault, Caitlin Gugins, and Heather Ainsworth (Frontier Geosciences Inc., North Vancouver, BC; 2015–2017); and Mel Best (BEMEX Consulting International, Victoria, BC; 2013–2019). The PRIME installation (2017 to present) is a collaboration with Helen Reeves and colleagues (British Geological Survey, Nottingham, UK). Fieldwork would not be possible without the support of Trevor Evans (CN, Kamloops, BC), and Danny Wong and Jason Bojey (CP, Calgary, Alberta). The contribution of Jessica Holmes was funded by the Department for the Economy (DfE), Northern Ireland. Greg Brooks (Geological Survey of Canada, Ottawa, Ontario) critically reviewed the draft manuscript. The manuscript also greatly benefitted from the suggestions and comments of three anonymous reviewers, Ali Polat (Editor-in-Chief), and Olav Lian (Associate Editor). This is Natural Resources Canada (NRCan) contribution number 20200326.

Funding Information:
Research was undertaken as part of the International Consortium on Landslides (ICL) International Programme on Landslides (IPL) Project 202 (www.iplhq.org). Activities at this site have led to World Centre of Excellence on landslide disaster reduction recognition for both the Geological Survey of Canada and the University of Alberta. Research was funded by Transport Canada and Natural Resources Canada. For their geophysical services, we thank Neil Parry, Megan Caston, Cassandra Budd, and Gordon Brasnett (EBA-TetraTech, Edmonton, Alberta; 2013?2014); Paul Bauman, Landon Woods, and Kimberly Hume (Advisian, Worley Parsons Group, Calgary, Alberta; 2014?2015); Cliff Candy, Larry Theriault, Caitlin Gugins, and Heather Ainsworth (Frontier Geosciences Inc., North Vancouver, BC; 2015?2017); and Mel Best (BEMEX Consulting International, Victoria, BC; 2013?2019). The PRIME installation (2017 to present) is a collaboration with Helen Reeves and colleagues (British Geological Survey, Nottingham, UK). Fieldwork would not be possible without the support of Trevor Evans (CN, Kamloops, BC), and Danny Wong and Jason Bojey (CP, Calgary, Alberta). The contribution of Jessica Holmes was funded by the Department for the Economy (DfE), Northern Ireland. Greg Brooks (Geological Survey of Canada, Ottawa, On-tario) critically reviewed the draft manuscript. The manuscript also greatly benefitted from the suggestions and comments of three anonymous reviewers, Ali Polat (Editor-in-Chief), and Olav Lian (Associate Editor). This is Natural Resources Canada (NRCan) contribution number 20200326.

Publisher Copyright:
© 2020, Canadian Science Publishing. All rights reserved.

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

Keywords

  • British Columbia
  • Geohazard monitoring
  • Geophysical surveys
  • Landslide
  • Surficial mapping

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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