| Titre | Four-dimensional electrical resistivity tomography for continuous, near-real-time monitoring of a landslide affecting transport infrastructure in British Columbia, Canada |
| |
| Auteur | Holmes, J; Chambers, J ; Meldrum, P; Wilkinson, P; Boyd, J; Williamson, P; Huntley, D; Sattler, K; Elwood, D; Sivakumar, V; Reeves, H; Donohue, S |
| Source | Near Surface Geophysics 2020., https://doi.org/10.1002/nsg.12102  Accès ouvert |
| Image |  |
| Année | 2020 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20200260 |
| Éditeur | Wiley |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1002/nsg.12102 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Province | Colombie-Britannique |
| Région | Thompson River Valley |
| Lat/Long OENS | -121.3333 -121.0000 51.0000 48.0000 |
| Sujets | résistivité électrique; glissements de terrain; variations géoélectriques; géophysique; hydrogéologie |
| Illustrations | cartes de localisation; photographies; organigrammes; tableaux; modèles 3D; graphiques; graphiques |
| Diffusé | 2020 04 01 |
| Résumé | (disponible en anglais seulement)
The Ripley Landslide is a small (0.04 km(2)), slow-moving landslide in the Thompson River Valley, British Columbia, that is threatening the serviceability of
two national railway lines. Slope failures in this area are having negative impacts on railway infrastructure, terrestrial and aquatic ecosystems, public safety, communities, local heritage and the economy. This is driving the need for monitoring at
the site, and in recent years there has been a shift from traditional geotechnical surveys and visual inspections for monitoring infrastructure assets toward less invasive, lower cost, and less time-intensive methods, including geophysics. We
describe the application of a novel electrical resistivity tomography system for monitoring the landslide. The system provides near-real time geoelectrical imaging, with results delivered remotely via a modem, avoiding the need for costly repeat
field visits, and enabling near-real time interpretation of the four-dimensional electrical resistivity tomography data. Here, we present the results of the electrical resistivity tomography monitoring alongside field sensor-derived relationships
between suction, resistivity, moisture content and continuous monitoring single-frequency Global Navigation Satellite System stations. Four-dimensional electrical resistivity tomography data allows us to monitor spatial and temporal changes in
resistivity, and by extension, in moisture content and soil suction. The models reveal complex hydrogeological pathways, as well as considerable seasonal variation in the response of the subsurface to changing weather conditions, which cannot be
predicted through interrogation of weather and sensor data alone, providing new insight into the subsurface processes active at the site of the Ripley Landslide. |
| GEOSCAN ID | 326672 |
|
|