We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Practical evaluation of single-frequency dGNSS for monitoring slow-moving landslides.
- Authors
J, Rodriguez; E, Deane; T, Hendry M.; R, Macciotta; T, Evans; C, Gräpel; R, Skirrow
- Abstract
Understanding the kinematics and triggers of a landslide is central to assessing the risk of a landslide. This understanding can be achieved through a robust instrumentation plan that addresses key factors such as meteorological conditions, groundwater conditions, and deformation trends and velocity. High-frequency landslide displacement measurements at multiple locations across a sliding mass allow for the evaluation of the impact of meteorological events in the short and long terms. Installation of a monitoring system that provides reliable and accurate high-frequency displacement data from multiple locations can be expensive, and thus, this approach is not commonly used. Single-frequency differential GNSS (dGNSS) provides a relatively low-cost alternative to achieve long-term monitoring goals at multiple locations within a landslide. Networks of single-frequency Geocube™ dGNSS units were installed at test sites at two slow-moving Canadian landslides: the Ten-mile landslide near Lillooet, BC, and the Chin Coulee landslide near Taber, AB. The Geocube system monitored surficial deformation every 60 s for the duration of the monitoring program (> 500 day) and achieved a precision in direct measurements characterized by a standard deviation of 10.5 mm or less. The quality of the collected data was compared to data provided by a high-end multi-frequency GMX 910 Leica GPS, installed at the Ripley landslide near Ashcroft, BC. The data collected from the Geocube systems revealed that displacement orientations and rates varied within each of the sliding masses. The application of multiple monitoring points provided a relatively low-cost method to evaluate the shape of the sliding shear surface and the causal factors driving movement at each site. A practical evaluation of cost-effective dGNSS systems that provide reliable information as required for enhanced understanding of landslide kinematics and the development of early warning systems is presented in this paper.
- Subjects
LANDSLIDES; DISPLACEMENT (Mechanics); SINGLE frequency network; NATURAL disaster warning systems; STANDARD deviations; UNITS of measurement
- Publication
Landslides, 2021, Vol 18, Issue 11, p3671
- ISSN
1612-510X
- Publication type
Article
- DOI
10.1007/s10346-021-01737-y