Effectiveness of distributed temperature measurements for early detection of piping in river embankments

Author:

Bersan Silvia,Koelewijn André R.,Simonini Paolo

Abstract

Abstract. Internal erosion is the cause of a significant percentage of failure and incidents involving both dams and river embankments in many countries. In the past 20 years the use of fibre-optic Distributed Temperature Sensing (DTS) in dams has proved to be an effective tool for the detection of leakages and internal erosion. This work investigates the effectiveness of DTS for dike monitoring, focusing on the early detection of backward erosion piping, a mechanism that affects the foundation layer of structures resting on permeable, sandy soils. The paper presents data from a piping test performed on a large-scale experimental dike equipped with a DTS system together with a large number of accompanying sensors. The effect of seepage and piping on the temperature field is analysed, eventually identifying the processes that cause the onset of thermal anomalies around piping channels and thus enable their early detection. Making use of dimensional analysis, the factors that influence this thermal response of a dike foundation are identified. Finally some tools are provided that can be helpful for the design of monitoring systems and for the interpretation of temperature data.

Publisher

Copernicus GmbH

Subject

General Earth and Planetary Sciences,General Engineering,General Environmental Science

Reference63 articles.

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2. Artiéres, O., Bonelli, S., Fabre, J.-P., Guidoux, C., Radzicki, K., Royet, P., and Vedrenne, C.: Active and passive defences against internal erosion of dikes, in: Assessment of the risk of internal erosion of water retaining structures: dams, dikes and levees, Intermediate report of the working group of ICOLD, Deutsches Talsperren Komitee, Technical University of Munich, 114 pp., 2007.

3. Artiéres, O., Beck, Y. L., Khan, A. A., Cunat, P., Fry, J. J., Courivaud, J. R., Guidoux, C., and Pinettes, P.: Assessment of dams and dikes behavior with a fibre optics based monitoring solution, Int. Congress on Dam Maintenance and Rehabilitation, Zaragaoza, Spain, 23–25 November, 2010.

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