Geophysical for granitic joint patern and subsurface hydrology related to slope instability

Silva, Ana Camila da; Resende, Isabela; Costa, Rodrigo Cintra da; Uagoda, Rogério; Avelar, André de Souza

doi:10.1016/j.jappgeo.2022.104607

Cited by 7 publications

(7 citation statements)

References 33 publications

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“…Multichannel Analysis of Surface Waves (MASW), Seismic Refraction Tomography (SRT), signal-station HVSR, Electrical Resistivity Tomography (ERT), and Ground Penetrating Radar (GPR) are the most common methods applied in landslide investigation. All these methods have been used mainly for defining dimensions, geometry [23], slip surface [24], groundwater table [12], recharge pathways [25], rock fragments [26], degree of compaction [27], and in some cases, the velocity of seismic waves within the landslide body [28]; these static properties are also related to the dynamic properties estimated by time-lapse seismic methods, therefore useful for susceptibility landslide analysis and hazard and risk management.…”

Section: Overview Of Gm Applied For Landslidesmentioning

confidence: 99%

“…The delineation of this near-surface fracture network is a challenging task [129]. The water dynamic of bedrock exfiltration of water through a fracture network triggered instability at the soil-bedrock interface leading to shallow translational landslides, as reported by [26]. The authors used GPR for the delineation of fracture networks and the presence of some rock fragments that can cause pore water pressure, a predominant trigger for the landslides in Rio de Janeiro, Brazil.…”

Section: Gm and Ls Dynamicsmentioning

confidence: 99%

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Review on the Geophysical and UAV-Based Methods Applied to Landslides

et al. 2022

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Landslides (LS) represent geomorphological processes that can induce changes over time in the physical, hydrogeological, and mechanical properties of the involved materials. For geohazard assessment, the variations of these properties might be detected by a wide range of non-intrusive techniques, which can sometimes be confusing due to their significant variation in accuracy, suitability, coverage area, logistics, timescale, cost, and integration potential; this paper reviews common geophysical methods (GM) categorized as Emitted Seismic and Ambient Noise based and proposes an integrated approach between them for improving landslide studies; this level of integration (among themselves) is an important step ahead of integrating geophysical data with remote sensing data. The aforementioned GMs help to construct a framework based on physical properties that may be linked with site characterization (e.g., a landslide and its subsurface channel geometry, recharge pathways, rock fragments, mass flow rate, etc.) and dynamics (e.g., quantification of the rheology, saturation, fracture process, toe erosion, mass flow rate, deformation marks and spatiotemporally dependent geogenic pore-water pressure feedback through a joint analysis of geophysical time series, displacement and hydrometeorological measurements from the ground, air and space). A review of the use of unmanned aerial vehicles (UAV) based photogrammetry for the investigation of landslides was also conducted to highlight the latest advancement and discuss the synergy between UAV and geophysical in four possible broader areas: (i) survey planning, (ii) LS investigation, (iii) LS dynamics and (iv) presentation of results in GIS environment. Additionally, endogenous source mechanisms lead to the appearance of deformation marks on the surface and provide ground for the integrated use of UAV and geophysical monitoring for landslide early warning systems. Further development in this area requires UAVs to adopt more multispectral and other advanced sensors where their data are integrated with the geophysical one as well as the climatic data to enable Artificial Intelligent based prediction of LS.

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Section: Overview Of Gm Applied For Landslidesmentioning

confidence: 99%

Section: Gm and Ls Dynamicsmentioning

confidence: 99%

Review on the Geophysical and UAV-Based Methods Applied to Landslides

et al. 2022

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“…Heavy rain can scour the pores, gradually enlarging them to form channels for surface infiltration, turning the precipitation into a preferential flow through large pores. A temporary groundwater level is formed in the loose layer with a larger hydraulic conductivity that causes floating drag and scouring of the rock and soil mass, and eventually leads to the large-scale occurrence of shallow landslides (Dai et al, 1999;Letto and Cella, 2016;Gong et al, 2017;Chen et al, 2022;Liao et al, 2022;Silva et al, 2022). At present, most relevant physical models assume that under conditions of no surface runoff, the mechanism of how macropore flow influences shallow landslides is still unclear.…”

Section: Introductionmentioning

confidence: 99%

Combining soil macropore flow with formation mechanism to the development of shallow landslide warning threshold in South China

Wang

Gong²,

Shang³

2023

Front. Earth Sci.

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Because of the physical character of soil from granite weathering and the typhoon rains in South China, the model for early warnings of existing shallow landslides cannot be well applied in that area. This study developed a new shallow landslide model based on the effect of soil macropores for determining the rainfall threshold to post an early warning of the possibility of a shallow landslide in South China. We studied the hydrological effects of macropore flow and proposed a mechanistic model of the formation of shallow landslides by introducing the macropore coefficient of granite residual soil. The rainfall threshold of each slope unit was calculated by combining the hydrological model with the proposed shallow landslide model. Lastly, we tested the calculated result in the Maguihe watershed, Guangdong province, South China, which experienced a group of massive shallow landslides on 21 September 2010. The study results showed that the macropores of vegetation roots had a significant effect by increasing the permeability of granite residual soil. Coniferous forest land has the highest initial infiltration rate and stable infiltration rate, followed by shrub forest land, and then bare land. Statistical verification showed that the accurate prediction rate of the proposed model was 80.65%, which is adequate for early warning of shallow landslides in South China. We discuss the application conditions and parameter calibrations of the proposed model, and offer recommendations for future research.

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“…The application of the geophysical method of GPR-Ground Penetrating Radar uses the principle of transmission of high frequency electromagnetic waves and their response to the existence of shallow subsurface geological structures and features [20,21]. This method is applied in hydrogeological and geotechnical studies for mapping fractures and faults [22][23][24][25][26][27][28], caves [29][30][31][32][33][34] and mineral research [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Mapping the integrity of rock mass with GPR: case study in decommissioning mining

Duz,

Moreira,

Casagrande

et al. 2023

SN Appl. Sci.

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Slopes are built for the purpose of extracting ore, in the case of mining, or access roads in civil works. The excavation of slopes in tropical countries is facilitated by the thick layer of soil formed from the more intense weathering when compared to other countries. However, the residence time of water in the soil is relatively longer and consequently allows the accumulation and percolation of water through rock fractures even in the dry period. These factors induce a greater probability of occurrence of ruptures. Mines in the decommissioning phase must guarantee slope stability conditions even after closure in order to comply with legislation and environmental safety. In this work, the slopes of a decommissioning mine were investigated using geophysical methods (GPR) and structural analysis of the rock mass. The results were presented in the form of radargrams that correlate distance and depth of investigation. Structural data served as the basis for the execution of kinematic analyzes for planar and wedge ruptures. The analysis of the results allowed the correlation between electromagnetic signal attenuation zones, with the presence of water and the occurrence of ruptures. Thus, the GPR results allowed the recognition of structural discontinuities, accumulation zones and water flow.

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Geophysical for granitic joint patern and subsurface hydrology related to slope instability

Cited by 7 publications

References 33 publications

Review on the Geophysical and UAV-Based Methods Applied to Landslides

Review on the Geophysical and UAV-Based Methods Applied to Landslides

Combining soil macropore flow with formation mechanism to the development of shallow landslide warning threshold in South China

Mapping the integrity of rock mass with GPR: case study in decommissioning mining

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