On Earth Dam Leak Detection Based on Using Fiber-Optic Distributed Temperature Sensor (Case Study: Canal Embankment on the Rhône River, France)

Abbasimaedeh, P.; Tatin, Maxime.; Lamour, Vincent; Vincent, H.; Bonelli, Stéphane; Garandet, Aurélie

doi:10.1007/978-3-030-79641-9_4

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…However, this approach cannot be used to monitor several tens to hundreds of metres of earth dams to detect early stages of internal erosion. This upscaling could be achieved using emerging techniques, such as distributed acoustic sensing, which has shown the ability of the technique to detect leakages in earth dams (Mateeva et al ., 2013; Abbasimaedeh et al ., 2021). Finally, such real sites are likely to exhibit much higher background noise than in the laboratory.…”

Section: Interpretation and Discussionmentioning

confidence: 99%

Geophysical monitoring of a laboratory‐scale internal erosion experiment

Maalouf

Bièvre

Khoury

2022

Near Surface Geophysics

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Earth dams are structures used worldwide for water management. Their failure over time is notably due to water seepage generating internal erosion. There is a growing need to detect the processes at work as early as possible. This study presents a controlled laboratory experiment aimed at detecting and monitoring water seepage into a soil sample. The experiment was monitored with electrical resistivity tomography, velocimeters and video recording. The video recording of the downstream side of the soil sample shows successive episodes of mass movements associated with a progressive water flow increase. The electrical resistivity tomography, limited by a low temporal resolution, shows an evolution of the resistivity in agreement with the evolution of the soil sample (e.g., saturation and mass movements), but with strong limitations regarding the robustness of the results. The continuous seismic recording reveals extra rupture episodes that occur inside the volume of the soil sample, which were not recorded by the video. Their distribution in time and energy illustrates strongly nonlinear changes in the soil sample, with several phases of acceleration. A controlled source monitoring using external repetitive events allows probing the medium with an enhanced temporal resolution compared to electrical resistivity tomography. The apparent seismic velocity of the soil sample reveals a nonlinear decrease, high at the beginning of the experiment, and then stalled until the different mass movements enlarge the amount of water inside the sample along with the water flow. The different techniques used, especially seismic monitoring, describe a complex and strongly nonlinear process of internal erosion centred around the coupling between water flow and internal damage. Finally, these findings suggest that seismic methods could be able to distinguish the four different phases of internal erosion (namely, initiation, continuation, progression and failure) discussed in the geotechnical literature.

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Section: Interpretation and Discussionmentioning

confidence: 99%

Geophysical monitoring of a laboratory‐scale internal erosion experiment

Maalouf

Bièvre

Khoury

2022

Near Surface Geophysics

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“…Perzlmaier, et al [10] and Nöther [11] demonstrated that distributed temperature sensing can efficiently identify concentrated seepage flows to detect leakage in concrete dams. Recent examples of DFO monitoring based on temperature measurement are being implemented at the University of Padova (Italy) by Bersan, et al [12] and by Cola, et al [13]- [14] for the Adige River in Italy, as well as in France on the Rhone River [15].…”

Section: Introductionmentioning

confidence: 99%

A Novel Distributed Fiber-Optic Hydrostatic Pressure Sensor for Dike Safety Monitoring

Höttges,

Rabaiotti,

Facchini

2023

IEEE Sensors J.

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Pore water pressure is the main driving force for soil collapse in nature. River dikes, earth dams and the foundation of structures built in water are eroded by internal infiltration into the soil (seepage / piping) or flow (scouring / overtopping). Climate change and the spread of urbanization increase the fragility of areas prone to flooding. Current methodologies for early detection of ongoing damage caused by water to these structures are inadequate for preventing structural collapse. Traditional hydrogeological monitoring is based on visual inspection of the infrastructure. In this research, a novel distributed fiber optic pressure sensor (DPS) was developed to measure variations in the pore water pressure with a spatial resolution of decimeters and over lengths in the order of kilometers. Extensive controlled pressure and temperature variation tests were carried out for calibrating water pressure and temperature sensitivity of the DPS. The resulting design of the sensor achieved a high sensitivity of 0.1 kPa (1 cmH2O). Additionally, the DPS functionality was validated in a reduced scale test embankment.

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Temperature monitoring in levees for detection of seepage

Fabbian,

Simonini,

De Polo

et al. 2024

Bull Eng Geol Environ

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Improving knowledge of existing levees through investigation and monitoring is an important step in evaluating their safety and that of the surrounding area. Nevertheless, these activities are complex due to the considerable levee length and the high spatial variability of soil composing the body and foundation, especially when paleo-rivers are present. In order to investigate the reliability of new advanced techniques proposed for characterizing the soil stratigraphy and the seepage condition within the levee foundation, a new test site was realized along the Adige River in Bolzano Province (Italy). Here, five boreholes, drilled in a 20-m-side square area straddling the embankment, host four different types of monitoring equipment, among which some are Distributed Fiber Optical Sensors (DFOS), here used for detecting the temperature variations along the well. The present paper focuses on the critical analysis of the preliminary results obtained with DFOS and their comparison with data obtained using traditional pressure and temperature probes. The monitoring data collected in the field during the passage of a flood that occurred on 5th August 2021 are used to better understand the hydraulic behavior and the safety conditions of the levee but also to fully assess the reliability and potential of DFOS.

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On Earth Dam Leak Detection Based on Using Fiber-Optic Distributed Temperature Sensor (Case Study: Canal Embankment on the Rhône River, France)

Cited by 3 publications

References 19 publications

Geophysical monitoring of a laboratory‐scale internal erosion experiment

Geophysical monitoring of a laboratory‐scale internal erosion experiment

A Novel Distributed Fiber-Optic Hydrostatic Pressure Sensor for Dike Safety Monitoring

Temperature monitoring in levees for detection of seepage

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