Geoelectrical characterization and monitoring of slopes on a rainfall-triggered landslide simulator

Hojat, A.; Arosio, Diego; Ivanov, Vladislav Ivov; Longoni, Laura; Papini, Monica; Scaioni, Marco; Tresoldi, G.; Zanzi, Luigi

doi:10.1016/j.jappgeo.2019.103844

Cited by 54 publications

(51 citation statements)

References 45 publications

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“…Geophysical methods have been commonly used to assess the stability of slopes and embankments [27][28][29][30]. In particular, electrical resistivity tomography (ERT) has shown to be efficient in monitoring the variations of water saturation and detecting seepage zones for a variety of studies focused on hydrogeological issues (e.g., [31][32][33][34][35]). In order to obtain a better view of the processes leading to collapse, several experiments featured electrical resistivity tomography (ERT) measurements.…”

Section: Geoelectrical Surveysmentioning

confidence: 99%

“…We decided to consider resistivity values instead of water content data, in order to avoid the introduction of uncertainties related to the type of terrain and its effective porosity. Detailed procedures on the choice of the best sampling configuration, corrections for the influence of boundary conditions, and data post-processing can be found in Tresoldi et al (2019) and Hojat et al (2019) [34,35].…”

Section: Geoelectrical Surveysmentioning

confidence: 99%

“…02, x FOR PEER REVIEW 5 of 19 of the best sampling configuration, corrections for the influence of boundary conditions, and data post-processing can be found in Tresoldi et al (2019) and Hojat et al (2019)[34,35].…”

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confidence: 99%

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Investigation on the Role of Water for the Stability of Shallow Landslides—Insights from Experimental Tests

Ivanov

Arosio

Tresoldi

et al. 2020

Water

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Shallow soil slips are a significant hydrogeological hazard which could affect extended areas of the high-gradient mountainous landscape. Their triggering is highly dependent on the rainfall water infiltration and its further redistribution, as well as the characteristic properties of the soil itself. The complex interaction between those factors generates a considerable degree of uncertainty in the understanding of the governing processes. In this work, we take a small step further towards the untangling of those intricate relationships through observation. The results of a set of 20 downscaled shallow land mass failures are analysed through a principal component analysis and a further detailed look at the resulting parametric trends. Moreover, electrical resistivity tomography measurements are added up to the interpretation of experimental data, by providing a glimpse on the rainfall water infiltration process at the subsurface level. The outcome of this work implies that the coupled interaction between rainfall intensity, hydraulic conductivity and soil moisture gradient is governing the stability of soil and while rainfall intensity and duration are essential instability predictors, they must be integrated with antecedent moisture and site-specific characteristics. A tentative comparison of the dataset with existing rainfall thresholds for shallow landslide occurrence suggests the potential application of experimental tests for thresholds' definition or validation under the appropriate dimensional analysis. A dimensional analysis indicated the interconnection of parameters intrinsic to the problem, and the significance of scale effects in performing a downscaled simulation of land mass failure.

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Section: Geoelectrical Surveysmentioning

confidence: 99%

Section: Geoelectrical Surveysmentioning

confidence: 99%

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Investigation on the Role of Water for the Stability of Shallow Landslides—Insights from Experimental Tests

Ivanov

Arosio

Tresoldi

et al. 2020

Water

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“…There are great concerns around the world over the years on the occurrences of damaging landslides (De Vita et al, 2018;Froude and Petley, 2018;Hojat et al, 2019;Whiteley et al, 2019). Slope movement events that resulted in landslide have wrecked severe havoc and damage to lives and infrastructures with an estimated loss of several billions of dollars across the world (Chandarana, 2016;Sidle and Bogaard, 2016;Winter et al, 2016;Soto et al, 2017;Wang et al, 2017;Bordoni et al, 2018;Di Traglia et al, 2018;Tomás et al, 2018;Moragues et al, 2019;Yang et al, 2019;Kirschbaum et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…According to the available data on global catalog of landslides, with Multi-Satellite Precipitation Analysis records, they have shown that a majority of landslide occurrences over the world were triggered by extreme rainfall events (Kirschbaum et al, 2015;Whiteley et al, 2019). Hojat et al (2019) and have also shown that landslide-prone slope becomes unstable at zones where the water saturation exceeds 45%, and they observed that slope instability could occur at the boundaries between areas with different water saturations. Changes in water conditions and slope geometry are the main factors that induce slope instability (Tang et al, 2018) in the presence of discontinuities such as faults, fractures, and beddings which are precursors to landslide (Chalupa et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Geotechnical-Assisted 2-D Electrical Resistivity Tomography Monitoring of Slope Instability in Residual Soil of Weathered Granitic Basement

2020

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Quantifying seasonal 3D effects for a permanent electrical resistivity tomography monitoring system along the embankment of an irrigation canal

Hojat

Arosio

Ivanov

et al. 2020

Near Surface Geophysics

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In this paper, we discuss the necessity of quantifying and correcting seasonal 3D effects on 2D electrical resistivity tomography (ERT) data measured along the embankments of rivers or artificial canals. A permanent ERT monitoring system has been continuously operating along the levee of an irrigation canal in Mantua province, Italy, since September 2015. To evaluate the importance of 3D effects and their dependence on seasonal variations, we first performed numerical simulations and also laboratory tests on downscaled levees of the study site. The results showed that 2D apparent resistivity pseudosections measured along the levee are significantly affected by 3D effects of the embankment geometry. Moreover, it was observed that 3D effects not only depend on the levee geometry, but they are also affected by seasonal fluctuations in the water level in the canal. This proved the importance of calculating 3D effects for the study site during dry and irrigation periods. Therefore, different synthetic models based on the levee geometry and water level in the canal in each period were constructed in RES2DMOD and RES3DMODx64 to quantify 3D effects for the study site. The ratios of apparent resistivity values calculated in RES3DMODx64 to the values calculated in RES2DMOD showed that 3D effects approach a maximum of 30% when the canal is empty during winter, and they arrive at a maximum of 10% when the canal is filled with water in summer. Using the graphs of the modelled 3D effects as a function of electrode spacing, apparent resistivity pseudosections measured by the permanent ERT system are corrected for 3D effects to obtain reliable resistivity sections after inversion. The final resistivity maps can be then converted into water content images using the empirical and site‐dependent relationship developed from core samples in the study area. Water content maps can be used to evaluate the stability of the levee and to detect possible seepage zones.

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Geoelectrical characterization and monitoring of slopes on a rainfall-triggered landslide simulator

Cited by 54 publications

References 45 publications

Investigation on the Role of Water for the Stability of Shallow Landslides—Insights from Experimental Tests

Investigation on the Role of Water for the Stability of Shallow Landslides—Insights from Experimental Tests

Analysis of Geotechnical-Assisted 2-D Electrical Resistivity Tomography Monitoring of Slope Instability in Residual Soil of Weathered Granitic Basement

Quantifying seasonal 3D effects for a permanent electrical resistivity tomography monitoring system along the embankment of an irrigation canal

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