Detailed Geophysical Imaging of the Shallow Surfaces at an Underseepage Site Behind of a Levee

Inazaki, Tomio; Kaneko, Masahiro; Aoike, Kunio

doi:10.4133/sageep.29-020

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…Therefore, geo-electrical methods can be effectively used to detect time variations of soil properties. In previous decades, resistivity measurements were widely used in hydro-geophysical investigations, to scan the inner conditions of embankments, dams and landslides (Piegari et al 2008;Cardarelli et al 2014;Inazaki et al 2016;Huntley et al 2019;Kotikian et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Introducing G.RE.T.A. – an innovative geo-resistivimeter for long-term monitoring of earthen dams and unstable slopes

Tresoldi¹,

Hojat²,

Zanzi³

et al. 2020

Proceedings of the 2020 International Symposium on Slope Stability in Open Pit Mining and Civil Engineering

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Nowadays there is an increasing interest in introducing techniques capable of monitoring the internal conditions of embankments and slopes in order to develop early warning alarm systems. Geophysical methods have been widely used in geotechnical risk mitigation studies to evaluate the stability conditions of dams, embankments and slopes. Geophysical methods have the advantage of investigating large volumes of subsurface in a non-invasive manner. Among different geophysical techniques, geo-electrical methods are more frequently used for this purpose.In previous decades, electrical resistivity tomography (ERT) technique has been widely used in a variety of problems such as engineering investigations, groundwater studies, landfill surveys, mineral exploration, glaciological applications, hydrogeological risk mitigation (e.g. landslides), and monitoring of embankments, earthen dams and tailings dams. Commercial resistivity instruments are portable devices which are generally capable of investigating the subsurface down to depths of a few hundred metres with high injected currents. These instruments are not customised for long-term installations in remote places. In this paper, we present the design, installation and testing of a new geo-electrical monitoring system customised for long-term monitoring projects.In the first step, the feasibility of using time-lapse ERT method to study the saturation and de-saturation processes and to monitor anomalous seepage paths in a levee was demonstrated. Then, a long-term geo-electrical monitoring system, G.RE.T.A. (Geo REsistivimeter for Time-lapse Analysis), was designed based on the information obtained in the first step. The G.RE.T.A. system is capable of being programmed remotely and working autonomously In order to monitor anomalous seepages in levee structures that can lead to the levee breach, two installations of G.RE.T.A. have been completed along two river embankments in northern Italy. In order to develop the system to monitor landslides, laboratory studies are in progress to monitor rainfall-triggered landslides. The results have proved the capability of ERT measurements in delineating inhomogeneous infiltration zones during precipitation and detecting weak zones before collapse.

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Section: Introductionmentioning

confidence: 99%

Introducing G.RE.T.A. – an innovative geo-resistivimeter for long-term monitoring of earthen dams and unstable slopes

Tresoldi¹,

Hojat²,

Zanzi³

et al. 2020

Proceedings of the 2020 International Symposium on Slope Stability in Open Pit Mining and Civil Engineering

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show abstract

“…The first objective of the Tech-Levee-Watch (TLW) project is addressed by testing vehicle-mounted systems (Electromagnetic devices and Ground Penetrating Radar (GPR) arrays) to scan several tens of kilometers per day in order to detect potentially unstable zones of the embankments. GPR is a popular geophysical method that has already gained some credibility as an effective method for the assessment of levee conditions (Di Prinzio et al, 2010;Chlaib et al, 2014;Inazaki et al, 2016). More specifically, it is especially used to detect holes in the levee body, which in most cases are rodents' burrows.…”

Section: Introductionmentioning

confidence: 99%

Tech-Levee-Watch: experimenting an integrated geophysical system for stability assessment of levees

Tresoldi¹,

Arosio²,

Hojat³

et al. 2018

ROL

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The aim of the Tech-Levee-Watch project is to combine geophysical technologies into an integrated system of diagnosismonitoring-alert related to the vulnerability of earthen levees. A first milestone of the project consists in validating a fast scanning methodology based on a proper combination of portable geophysical instruments tailored to detect possible unstable areas of the levee structures. A second milestone consists in monitoring the most critical sites by installing a low-power fully-automatic geo-resistivity meter prototype programmed for wireless daily transmission of resistivity maps. The third milestone is the calibration of a relation between resistivity values and water content values so that resistivity maps will be transformed into water content maps used to feed a simulator of the levee stability. The final milestone consists of calibrating a set of thresholds in order to define an earlywarning procedure to be delivered to administrations and citizens. This procedure can help authorities to organize maintenance of the embankments and to face critical situations that can lead to economic damages and loss of human lives.

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Detailed GPR Survey for Detecting Boulders Buried in a Subgrade of a Highway Under Construction

Kisanuki

Aoike

Ogahara

et al. 2018

Symposium on the Application of Geophysics to Engineering and Environmental Problems 2018

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Detailed Geophysical Imaging of the Shallow Surfaces at an Underseepage Site Behind of a Levee

Cited by 3 publications

References 2 publications

Introducing G.RE.T.A. – an innovative geo-resistivimeter for long-term monitoring of earthen dams and unstable slopes

Introducing G.RE.T.A. – an innovative geo-resistivimeter for long-term monitoring of earthen dams and unstable slopes

Tech-Levee-Watch: experimenting an integrated geophysical system for stability assessment of levees

Detailed GPR Survey for Detecting Boulders Buried in a Subgrade of a Highway Under Construction

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