In-situ geophysical and hydro-geochemical monitoring to infer landslide dynamics (Pégairolles-de-l'Escalette landslide, France)

Denchik, N.; Gautier, Stéphanie; Dupuy, Margaux; Batiot‐Guilhe, Christelle; López, Michel; Léonardi, Véronique; Geeraert, Muriel; Henry, Gilles; Neyens, Denis; Coudray, Paul; Pézard, Philippe

doi:10.1016/j.enggeo.2019.04.009

Cited by 29 publications

(6 citation statements)

References 34 publications

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“…Profiles in units A and C, 75 m from shore, show low and uniform EC values (5-6 mS/cm, like the natural conductivity in this area), while in unit B an interface was observed at a depth of 22 m, and salinity of bottom water reached 40 mS/cm [18]. In this study, electrical conductivity was measured by several methods: SMD (subsurface monitoring device) is a new automatic, remote-controlled multi sensor geophysical tool, which allows the measurement of water EC profiles and other parameters, such as water level and temperature profiles [19][20][21][22][23]. The SMD includes a cable loaded with electrodes which is deployed in a borehole and provides a profile of the resistivity of the rock formation around the borehole.…”

Section: Methodsmentioning

confidence: 99%

High Resolution Monitoring of Seawater Intrusion in a Multi-Aquifer System-Implementation of a New Downhole Geophysical Tool

Tal

Weinstein

Baïsset

et al. 2019

Water

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Monitoring of seawater intrusion is extremely important for the management of coastal aquifers, and therefore requires reliable and high-frequency monitoring tools. This paper describes the use of a new near field and downhole geophysical tool that monitors seawater intrusion in boreholes with high vertical resolution. This sensor is further used to study the impact of pumping on water electrical conductivity profiles (ECP) at the fresh-saline water interface. The new device was installed in a confined calcareous sandstone aquifer along the northern Israeli coast. The site includes two monitoring wells and one pumping well located at distances of 50, 75 and 125 m from shoreline, respectively. The new geophysical tool, called the subsurface monitoring device (SMD), was examined and compared to water an electric conductivity profiler (ECP) and a conductivity temperature depth (CTD) driver’s data. All methods show similar salinity trends, and changes in pumping regime were clearly identified with both the SMD and CTD. The advantage of using the SMD tool is the high temporal and spatial resolution measurement, which is transferred via internet and can be analyzed and interpreted in real time. Another advantage of the SMD is that it measures the electrical resistivity of the aquifer mostly outside the well, while both water ECP and the CTD measure in-well electrical conductivity; therefore, are subjected to the artefact of vertical flow in the well. Accordingly, while the CTD shows an immediate and sharp response when pumping is stopped, the SMD provides a gradual electric conductivity (EC) change, demonstrating that stability is reached just after a few days, which illustrates, more precisely, the hydrological response of the aquifer.

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Section: Methodsmentioning

confidence: 99%

High Resolution Monitoring of Seawater Intrusion in a Multi-Aquifer System-Implementation of a New Downhole Geophysical Tool

Tal

Weinstein

Baïsset

et al. 2019

Water

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“…The results of these experiments verified the correlation of electrical parameters such as self-potential and primary field potential with the spatial and temporal distribution of moisture. Zeng et al [28], Uhlemann et al [29], Boyle et al [30], Whiteley et al [19], Denchik et al [31], and Boyd et al [32] installed ERT devices on actual landslides and combined drilling, mapping, and other data to investigate the internal water transport of landslides under rainfall conditions and its impact on landslide failure. Manoli et al [33], Carey et al [34], and Hojat et al [26] used numerical simulation approaches to compute and assess the geoelectric field response characteristics of the soil during rainfall infiltration.…”

Section: Introductionmentioning

confidence: 99%

Using Electrical Resistivity Tomography to Monitor the Evolution of Landslides’ Safety Factors under Rainfall: A Feasibility Study Based on Numerical Simulation

Bai

Zhu

et al. 2022

Remote Sensing

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Although electrical resistivity tomography (ERT) may gather the internal resistivity information from a landslide area in a large-scale, low-cost, and non-invasive manner compared to point-based sensor monitoring technology, the indirect resistivity information obtained cannot directly evaluate the landslide’s current mechanical status, such as stress, strength, etc. Based on ERT monitoring data, a framework for quantitatively and directly evaluating the evolution of the factor of safety (FOS) of landslides during rainfall is proposed. The framework first inverts ERT observation data using the inexact Gauss–Newton method based on multiple constraints to obtain a more realistic resistivity distribution, then calculates the saturation distribution using Archie’s equation, and finally calculates the FOS of landslides using the finite element strength reduction method. Twelve sets of numerical experiments were designed and carried out based on the synthetic data of a theoretical model. The experimental results show that the proposed framework is valid and reliable under various arrays, apparent resistivity noise, and uncertainty in the water-electric correlation curve, with the Dipole-Dipole array outperforming the others in terms of accuracy, sensitivity, and anti-noise capability. The proposed framework is significant in improving ERT monitoring and early warning capabilities for rainfall-induced landslides.

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“…Historically, rainfall and earthquake-induced landslides have caused problems to Southwestern China inhabitants and infrastructures. Some factors like heavy rains, groundwater circulations, and earthquakes are considered to be the driving force behind landslide initiation (Xing et al 2014;Bogaard and Greco 2016;Denchik et al 2019). In modern days, slope stability investigations involve geotechnical tests, geological and geophysical surveys, and hydrogeological studies to characterize the geometry and identify the hazard associated due to subsurface deformation (Godio and Bottino 2001;Zeng et al 2016;Bellanova et al 2018;Chen et al 2018;Gallistl et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Geophysical prospecting related to earthflow reactivation and hazard assessment: a study based on Huangnibazi slope failure in Sichuan Province, China

Ullah

Cheng

et al. 2021

Bull Eng Geol Environ

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Combined geophysical surveys were performed to evaluate the stability of Huangnibazi earth-flow located in Sichuan Province, China. The mass of debris landslide was extremely non-uniform and preferential outflow tracks were established in it. Hence, the identification of the subsurface water seepage channels and their spatial distribution is the main concern. The landslide hydro-geological characteristics and structures are the essential source to evaluate the landslide stability, protection, and administration. The investigation was performed few months after the landside occurrence and a geophysical survey was designed to identify the vulnerable sections. The geomorphological features indicate that the topsoil of the accumulated debris is highly unconsolidated and the debris is a potential threat for the community in case of reactivation. From the geophysical results, we interpret and identify susceptible geological boundaries that are highly saturated and can act as the source for reactivation. From the lateral and spatial distribution of active and inactive materials, we concluded that the landside reactivation can initiate anywhere between the depth of 30-50 m. An analysis was performed by creating a 3D model from the electrical resistivity method to illustrate the stable and unstable debris sections. Slope stability models were established by comparing surface waves and electrical resistivity data of Huangnibazi stable and disturbed sections.The comparison shows that it is a good practice in detecting landslide hazards and locating extents that do not originally give the impression of failure conditions but are actually at high risk.

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In-situ geophysical and hydro-geochemical monitoring to infer landslide dynamics (Pégairolles-de-l'Escalette landslide, France)

Cited by 29 publications

References 34 publications

High Resolution Monitoring of Seawater Intrusion in a Multi-Aquifer System-Implementation of a New Downhole Geophysical Tool

High Resolution Monitoring of Seawater Intrusion in a Multi-Aquifer System-Implementation of a New Downhole Geophysical Tool

Using Electrical Resistivity Tomography to Monitor the Evolution of Landslides’ Safety Factors under Rainfall: A Feasibility Study Based on Numerical Simulation

Geophysical prospecting related to earthflow reactivation and hazard assessment: a study based on Huangnibazi slope failure in Sichuan Province, China

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