Long-term monitoring of sub-surface change in earth embankment dams

Chambers, J. and Goff, C. and Slater, N. and Meldrum, P. and Wilkinson, P. and Gunn, D. (2021) Long-term monitoring of sub-surface change in earth embankment dams. In: INCOLD 2021 Symposium, 24 - 27 February 2021, New Delhi, India and Online.

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Official URL: https://www.icold2020.org/Proceedings/Data/Themes/...


Here we describe the development of a novel characterisation and monitoring approach for embankments such as earth dams. The system, called PRIME (Proactive Infrastructure Monitoring and Evaluation), is based on time-lapse electrical resistivity tomography (ERT), which is a geophysical technique used to non-invasively image subsurface resistivity to depths of tens of metres. Resistivity is a useful property because it is sensitive to compositional variations, changes in moisture content, and ground movement. PRIME is a low-cost system designed for remote operation, allowing resistivity images to be captured automatically and streamed via a web interface. It comprises four key elements: (1) low-power field instrumentation; (2) data telemetry and storage; (3) automated data processing; (4) and web dashboard information delivery. These elements form the basis of an asset condition monitoring approach that provides near-real-time spatial information on both subsurface processes and surface responses The use of this approach is illustrated with reference to a series of studies relating to earthwork condition monitoring. These studies demonstrate that PRIME provides a means of spatially tracking complex subsurface moisture driven processes (such as leakage or settlement) that would be very difficult to characterise using other approaches (e.g. surface observations or intrusive sampling).

Item Type: Conference or Workshop Item (Paper)
Subjects: Floods > Dams and reservoirs
Divisions: Floods
Depositing User: Helen Stevenson
Date Deposited: 26 Mar 2021 14:15
Last Modified: 08 Apr 2021 15:06
URI: http://eprints.hrwallingford.com/id/eprint/1474

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