Characterization of Sobradinho landslide in fluvial valley using MASW and ERT methods

Abstract Landslides can substantially impact the fluvial systems, which is why the continuous mapping of their extent, evolution and stability assessment is crucial. However, in such environments, material identification (e.g. colluvium) and subsurface characterization by the methods used for geolog...

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Bibliographic Details
Published in:REM - International Engineering Journal 2020-12, Vol.73 (4), p.487-497
Main Authors: Hussain, Yawar, Hamza, Omar, Cárdenas-Soto, Martín, Borges, Welitom Rodrigues, Dou, Jie, Rebolledo, Juan Félix Rodriguez, Prado, Renato Luiz
Format: Article
Language:English
Subjects:
dipole-dipole array
dispersion curve
ENGINEERING, MECHANICAL
fluvial valley
GEOLOGY
MECHANICS
METALLURGY & METALLURGICAL ENGINEERING
stratigraphic sections
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Summary:Abstract Landslides can substantially impact the fluvial systems, which is why the continuous mapping of their extent, evolution and stability assessment is crucial. However, in such environments, material identification (e.g. colluvium) and subsurface characterization by the methods used for geologic mapping and geotechnical investigation is often a challenging task. Thus, these classical invasive methods may benefit from geophysical techniques to enable and enhance our understanding of the subsurface in these areas. To examine such integrated approach, Multi-Channel Analysis of Surface Waves (MASW) combined with Electrical Resistivity Tomography (ERT) were applied on a geomorphologically active fluvial valley in Sobradinho (the Federal District of Brazil). The subsurface materials showed a specific range of resistivity values as dry soil, saprolite, and landslide slip surface. The 1D shear wave velocity (Vs) model showed an increasing trend of Vs with depth at a location away from the landslide mass, while the longitudinal profile (over the landslide) showed an anomalous change in Vs (~ 250 to 400 m/sec). Based on the existing information about the landslide, the ERT appeared to be an effective method over MASW. This study shows how the integration of geophysical data with the geological and geotechnical investigation helps to obtain a more realistic or unambiguous model of the subsurface.
ISSN:2448-167X
2448-167X
DOI:10.1590/0370-44672019730109