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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 and Nicholas J. Roberts
Hydrogeological and geophysical properties of the very-slow-moving Ripley Landslide, Thompson River valley, British Columbia
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (December 2020) 57 (12): 1371-1391

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 nonfractured 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.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 57
Serial Issue: 12
Title: Hydrogeological and geophysical properties of the very-slow-moving Ripley Landslide, Thompson River valley, British Columbia
Affiliation: Geological Survey of Canada, Vancouver, BC, Canada
Pages: 1371-1391
Published: 202012
Text Language: English
Summary Language: French
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 78
Accession Number: 2021-010132
Categories: Environmental geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., strat. cols., 2 tables, geol. sketch maps
N50°36'00" - N50°45'00", W121°30'00" - W121°15'00"
Secondary Affiliation: Queen's University Belfast, GBR, United KingdomBritish Geological Survey, GBR, United KingdomUniversity College Dublin, IRL, IrelandUniversity of Saskatchewan, CAN, CanadaUniversity of Alberta, CAN, CanadaMineral Resources Tasmania, AUS, Australia
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from Canadian Science Publishing, NRC Research Press, Ottawa, ON, Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202103
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