Aplicação Do GPR Para Análise E Diferenciação Entre Materiais Aluvionares E Coluvionares, Embasadas Em Observações Diretas, No Vale Do Ribeirão Contagem - Distrito Federal (Brasil)

Nunes, José Gustavo da Silva; Uagoda, Rogério; Caldeira, Dandara; Braga, Ligier Modesto; Hussain, Yawar; Martinez-Carvajal, Hernan

doi:10.20502/rbg.v20i2.1382

Cited by 3 publications

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“…The failure envelope curves showed high shear stress supported by the convex slope soils at the expense of others. Detailed descriptions can be found in [56] and [59].…”

Section: Site Characterizationmentioning

confidence: 99%

“…On the GPR profile (Figure 2c), the landslide material is well separated from the surrounding materials. These results were compared with soil sampling analysis [59].…”

Section: Site Characterizationmentioning

confidence: 99%

“…Soil analysis was conducted using the samples recovered before the execution of the GPR profiles and also during the fieldwork, aiming at the comparison with GPR data. The material property contrast may help to understand different behaviors of the electromagnetic wave amplitude [59]. The ERT profile covers the landslide body showing a continuous contrast that could be associated with the presence of a sliding surface ( Figure 2).…”

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confidence: 99%

“…(c) GPR results taken at the base of landslide showing reflection amplitude. The interface between fluvial and landslide deposits is marked with dotted red lines[59]. The scales of these figures are different.…”

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confidence: 99%

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Multiple Geophysical Techniques for Investigation and Monitoring of Sobradinho Landslide, Brazil

et al. 2019

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Geophysical methods have a varying degree of potential for detailed characterization of landslides and their dynamics. In this study, the application of four well-established seismic-based geophysical techniques, namely Ambient Noise Interferometry (ANI), Horizontal to Vertical Spectral Ratio (HVSR), Multi-Channel Analysis of Surface Waves (MASW) and Nanoseismic Monitoring (NM), were considered to examine their suitability for landslide characterization and monitoring the effect of seasonal variation on slope mass. Furthermore, other methods such as Ground Penetrating Radar (GPR) and DC Resistivity through Electrical Resistivity Tomography (ERT) were also used for comparison purpose. The advantages and limitations of these multiple techniques were exemplified by a case study conducted on Sobradinho landslide in Brazil. The study revealed that the geophysical characterization of the landslide using traditional techniques (i.e., GPR, ERT and MASW) were successful in (i) the differentiation between landslide debris and other Quaternary deposits, and (ii) the delineation of the landslide sliding surface. However, the innovative seismic based techniques, particularly ambient noise based (HVSR and ANI) and emitted seismic based (NM), were not very effective for the dynamic monitoring of landslide, which might be attributed to the short-time duration of the data acquisition campaigns. The HVSR was also unsuccessful in landslide site characterization i.e., identification of geometry and sliding surface. In particular, there was no clear evidence of the light seasonal variations, which could have been potentially detected from the physical parameters during the (short-time) ambient noise and microseismic acquisition campaigns. Nevertheless, the experienced integration of these geophysical techniques may provide a promising tool for future applications.

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“…The failure envelope curves showed high shear stress supported by the convex slope soils at the expense of others. Detailed descriptions can be found in [56] and [59].…”

Section: Site Characterizationmentioning

confidence: 99%

“…On the GPR profile (Figure 2c), the landslide material is well separated from the surrounding materials. These results were compared with soil sampling analysis [59].…”

Section: Site Characterizationmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Multiple Geophysical Techniques for Investigation and Monitoring of Sobradinho Landslide, Brazil

et al. 2019

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Seismic signatures and site characterization of an intermittent stream in dry and flood conditions: an implication for soil losses and landslide triggering

et al. 2023

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The seasonal soil losses and frequent shallow landslides in the Cerrado region of Brazil have high destructive potential with social, economic, and climatic implications. As fluvial systems substantially drive such environmental threats; therefore, it is essential to conduct geological site characterization and continuously monitor the rivers' and streams' seasonal erosive potentials. However, in such unstable and sensitive conditions, traditional intrusive investigation approaches may not be safe, the geophysical investigation might offer a good alternative. For the present study, a geophysical approach (particularly the seismic method) was adopted to examine the seismic footprints and GPR site characterization of a seasonal stream in the Rua do Matto, Brasilia, Brazil. The monitoring was conducted (at a safe distance) on the intermittent stream over several durations of dry (no rain) and rainy (flood) conditions. After pre-processing the raw data, the power spectral density (PSDs) was computed as a function of several variables (wind speed), time-frequency spectrograms, ambient noise displacement root mean square (RMS), the single station horizontal-to-vertical spectral ratio (HVSR) curves. In addition, changepoint analysis was used for comparing the ambient noise with wind speed (both were well correlated). The GPR amplitude and waveform variation features were attributed to the subsurface material and the presence of boulders in the floodplain and regions (low coherence value) susceptible to erosion (weak spots). The river flows were evident in the spectrograms, HVSR curves and different patterns of RMS displacements (at selective frequency ranges). The multi-peaks that emerged on the HVSR curve are further analyzed for changes in amplitude, width and troughs possibly related to river activities and soil moisture due to rain. The approach provides the basis for non-destructive monitoring tools enabling the detection of 'seismic signatures' and weak spots of the fluvial channels for improving environmental management.

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Variation in Rayleigh wave ellipticity as a possible indicator of earthflow mobility: a case study of Sobradinho landslide compared with pile load testing

et al. 2020

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Rainfall-induced landslides pose a significant risk to communities and infrastructures. To improve the prediction of such events, it is imperative to adequately investigate the rainfall-dependent dynamics (leading to fluidization) and any associated internal sliding along shear planes within clayey slopes. Therefore, the present study adopted ambient noise analysis based on the Horizontal to Vertical Spectral Ratio (HVSR) method, to measure the seasonal variation of Rayleigh wave ellipticity as an indicator for the internal deformation and transition in the material state. The methodology was applied to an existing landslide, where variations in soil stiffness and internal sliding were expected to occur in response to rainfall. To improve the interpretation of the HVSR results (and hence the prediction of landslide’ reactivation by rainfall), HVSR measurements were also conducted on a field-scale pile load test. The pile test allowed a comparison of the seismic data generated by the soil movement along shear planes. The HVSR curves of this field test showed two frequency peaks with no changes in the resonance. In comparison with the data obtained from the landslide, the resultant HVSR curves showed three frequency patterns: ubiquitous (2Hz), landslide (4-8Hz), and flat (no peak). However, the HVSR curves did not show any response to the expected seasonally induced variations in the landslide mass because of the relatively short data acquisition. Nevertheless, time-lapse HVSR is a promising technique that can complement other geophysical methods for improving landslide monitoring.

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Aplicação Do GPR Para Análise E Diferenciação Entre Materiais Aluvionares E Coluvionares, Embasadas Em Observações Diretas, No Vale Do Ribeirão Contagem - Distrito Federal (Brasil)

Cited by 3 publications

References 0 publications

Multiple Geophysical Techniques for Investigation and Monitoring of Sobradinho Landslide, Brazil

Multiple Geophysical Techniques for Investigation and Monitoring of Sobradinho Landslide, Brazil

Seismic signatures and site characterization of an intermittent stream in dry and flood conditions: an implication for soil losses and landslide triggering

Variation in Rayleigh wave ellipticity as a possible indicator of earthflow mobility: a case study of Sobradinho landslide compared with pile load testing

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