| Title | Hydrogeological and geophysical properties of the very-slow-moving Ripley Landslide, Thompson River valley, British Columbia |
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| Author | Huntley, D H ;
Holmes, J; Bobrowsky, P; Chambers, J; Meldrum, P; Wilkinson, P; Donohue, S; Elwood, D; Sattler, K; Hendry, M;
Macciotta, R; Roberts, N J |
| Source | Canadian Journal of Earth Sciences vol. 57, issue 12, 2020 p. 1371-1391, https://doi.org/10.1139/cjes-2019-0187  Open Access |
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| Year | 2020 |
| Alt Series | Natural Resources Canada, Contribution Series 20200326 |
| Publisher | Canadian Science Publishing |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf; html |
| Province | British Columbia |
| NTS | 92I/11 |
| Area | Thompson River; Ashcroft |
| Lat/Long WENS | -121.3333 -121.2167 50.7167 50.6333 |
| Subjects | surficial geology/geomorphology; stratigraphy; hydrogeology; structural geology; geophysics; Science and Technology; Nature and Environment; Health and Safety; Transport; landslides; slope failures;
slope stability analyses; creep; hydrostratigraphic units; lithostratigraphy; geophysical surveys; electrical surveys; electrical resistivity; e m surveys; radar methods; seismic surveys; geophysical logging; soil moisture; groundwater flow; climate
effects; glacial deposits; tills; outwash; bedrock geology; structural features; fractures; pore pressures; Ripley Landslide; Infrastructures; Railway networks; monitoring; glaciofluvial sediments; Phanerozoic; Cenozoic; Quaternary |
| Illustrations | location maps; photographs; tables; geoscientific sketch maps; lithologic sections; fence diagrams; 3-D images; time series |
| Program | Public
Safety Geoscience Terrestrial Landslides |
| Released | 2020 08 20 |
| 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. |
| Summary | (Plain Language Summary, not published)
Landslides south of Ashcroft, British Columbia have repeatedly damaged vital railway infrastructure, and threaten public safety and natural resources.
New hydrogeological and geophysical datasets enhance understanding of the composition and internal structure of this landslide and provide important context to interpret multi-year monitoring underway in the valley. |
| GEOSCAN ID | 327011 |
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