Determination of mechanisms and hydrogeological environments of Gangxianlane landslides using geoelectrical and geological data in central Taiwan

Lee, Cheng-Chao; Zeng, Li-Sheng; Hsieh, C. Y.; Yu, C.; Hsieh, Sheng-Hsiung

doi:10.1007/s12665-012-1522-5

Cited by 12 publications

(5 citation statements)

References 25 publications

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“…This geometry can be acquired easily from ERT data because of the high resistivity contrast between colluvium sediments and underlying layers, especially when borehole data are also considered (Lee et al 2012). …”

Section: Discussionmentioning

confidence: 99%

Monitoring landslides with geophysical and geodetic observations

2015

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The objective of this study was to evaluate and predict land movement by integrating geodetic, geophysical and meteorological data in a landslide area. Specifically, electrical resistivity tomography surveying, Global Navigation Satellite System and terrestrial laser scanning techniques were integrated to monitor a landslide. The study area lies to the southeast of the town of Taşkent in southern Turkey, close to Balcılar in the Central Taurus mountain chain. Landslides result in considerable damage to structures, farmland and the environment in this area; therefore, it is important to characterise the size, extent and timing of past land movements in order to mitigate damage from future landslides. Analysis presented in this paper shows that the greatest land movements in the region occur in spring, when average motions can be up to 1.5 m per month. It is demonstrated that integrated techniques provide a better means for monitoring landslide processes and gathering data for predictions of future movements. Mapping landslide movements by integrating geophysical and geodetic observations can provide a meaningful evaluation of a landslide and its dynamics.

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Section: Discussionmentioning

confidence: 99%

Monitoring landslides with geophysical and geodetic observations

2015

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“…The inversion of the TL-ERT data was carried using different methods [2,49], and the results highlighted possible preferential flows near the landslide toe in the steady stationary flow (Figure 3). Other field experiments planned for landslide investigations in Taiwan and Italy are reported in Lee et al, 2012, Luongo et al, 2012, and Quagliarini et al, 2017. [73]).…”

Section: Landslide Monitoringmentioning

confidence: 99%

Time-Lapse Electrical Resistivity Tomography (TL-ERT) for Landslide Monitoring: Recent Advances and Future Directions

Lapenna

Perrone

2022

Applied Sciences

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To date, there is a growing interest for challenging applications of time-lapse electrical resistivity tomography (TL-ERT) in Earth sciences. Tomographic algorithms for resistivity data inversion and innovative technologies for sensor networks have rapidly transformed the TL-ERT method in a powerful tool for the geophysical time-lapse imaging. In this paper, we focus our attention on the application of this method in landslide monitoring. Firstly, an overview of recent methodological advances in TL-ERT data processing and inversion is presented. In a second step, a critical analysis of the main results obtained in different field experiments and lab-scale simulations are discussed. The TL-ERT appears to be a robust and cost-effective method for mapping the water-saturated zones, and for the identification of the groundwater preferential pathways in landslide bodies. Furthermore, it can make a valuable contribution to following time-dependent changes in top-soil moisture, and the spatio-temporal dynamics of wetting fronts during extreme rainfall events. The critical review emphasizes the limits and the advantages of this geophysical method and discloses a way to identify future research activities to improve the use of the TL-ERT method in landslide monitoring.

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“…The reduction in soil matric suction decreases the soil shear strength, and consequently causes the slope to become unstable and fail (Li et al 2005). If the soil is completely saturated, soil matric suction will disappear completely and a perched water table with positive pore-water pressure will develop in the soil, this will lead to a reduction of the shear strength of the soil due to rise in pore-water pressure and loss of soil apparent cohesion, this will consequently trigger landslide (Fukuoka 1980;Wieczorek 1996;Li et al 2005;Lee et al 2012;Igwe et al 2013).…”

Section: Geotechnical Characteristicsmentioning

confidence: 99%

Landslide impacts and management in Nanka area, Southeast Nigeria

Igwe

Una

2019

Geoenviron Disasters

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The devastating impacts and mitigation measures for landslides in Nanka, Southeast Nigeria were studied. A procedure encompassing field mapping, laboratory analysis and limit equilibrium simulations were employed in the study. A total of 120 landslides in this area were documented during the field study. They were mainly shallow landslides with depth range of 0.2 m-1.8 m and slope angle range of 36 o-65 o. This study revealed that landslides in this area occur mainly during the rainy season, and are triggered by water infiltration in slopes with high gradient, where poorly consolidated sands overlies less permeable silty clay units in the Nanka Formation. The increase in pore water pressure due to soil saturation leads to reduction of the shear strength and loss of apparent cohesion. Geotechnical laboratory analysis showed that the thin silty clay soils found in the area have very high plasticity, while the sands are non-plastic. The limit equilibrium simulations revealed that as the slope angle increases, the potential slip mass volume increases. Our study in Nanka revealed that landslides have negatively affected the topography/morphology, settlement areas, agricultural lands and vegetation/land cover of the area and many areas are also threatened by this phenomenon. Standard mechanical drainage system and biotechnical slope protection have been suggested as mitigation measures. Finally, we suggested that landslide hazard information should be incorporated into long-term plans for Nanka and other areas prone to landslides, the public should be aware of the hazards and preventive measures.

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Determination of mechanisms and hydrogeological environments of Gangxianlane landslides using geoelectrical and geological data in central Taiwan

Cited by 12 publications

References 25 publications

Monitoring landslides with geophysical and geodetic observations

Monitoring landslides with geophysical and geodetic observations

Time-Lapse Electrical Resistivity Tomography (TL-ERT) for Landslide Monitoring: Recent Advances and Future Directions

Landslide impacts and management in Nanka area, Southeast Nigeria

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