Non-intrusive hydro-geophysical characterization of the unsaturated zone of South India-A case study

Arora, Tanvi; Boisson, Alexandre; Ahmed, Shakeel

doi:10.1016/j.jafrearsci.2016.04.021

Cited by 6 publications

(4 citation statements)

References 36 publications

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“…ERT offers continuous profiling of the earth medium and characterisation of soil constituents, vadose zone, thicknesses of strata/overburden covers, bedrock topography and structures for sustainable groundwater exploitation (Daily et al 1991;Arora and Ahmed 2011;Arora et al 2016;Uhlemann et al 2017;Amaya et al 2018;Costall et al 2018;Hojat et al 2020;McLachlan et al 2020), as well as information about soil properties pertinent to engineering studies (Abu-Zied 1994;Ganerød et al 2006;Robineau et al 2007;Wisén et al 2008;Osazuwa and Chii 2009;Ngan-Tillard et al 2010;Maslakowski et al 2014;Mao et al 2015;Maurits et al 2017;Abudeifa et al 2019;Akingboye et al 2020), particularly in complex geological areas. The technique also plays important roles in geology and other large-scale site characterisation (Nguyen et al 2005;Dahlin et al 2007;Bery and Saad 2012;Binley et al 2015;Bernardinetti et al 2018;Dahlin and Loke 2018;Gourdol et al 2018;Mita et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Subsurface geological, hydrogeophysical and engineering characterisation of Etioro-Akoko, southwestern Nigeria, using electrical resistivity tomography

Akingboye

Osazuwa

2021

NRIAG Journal of Astronomy and Geophysics

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Noninvasive geoelectrical subsurface characterisation provides screening of the earth medium to resolve complexity in subsurface geology caused by inhomogeneity of the overburden strata and bedrock architectures. The subsurface geological, hydrogeophysical and engineering conditions of Etioro-Akoko, southwestern Nigeria, were investigated using electrical resistivity tomography (ERT). This was aimed at unravelling the hydrogeodynamic and litho-structural complexity that are responsible for low groundwater yield in wells/boreholes and foundation failures. Field 2D resistivity data sets of the study area were inverted and used to produce geotomographic models for detailed insights into the complex subsurface geological setting. Results of the 2D resistivity inverted models showed three to four distinct layers; the topsoil, weathered layer, partially weathered/fractured bedrock and fresh bedrock. Bedrock structures occasioned by fracturing and deep weathering of the bedrock were delineated with resistivities and thicknesses ranging from 40 to 950 Ωm and 10-25 m, respectively. The fracture systems; F1, F2, F3, F4 and F5 in NW-SE, NNW-SSE, NE-SW and ENE-WSW orientations act as the major groundwater collecting centres in the area. The orientations and geometries of these geologic features are the manifestations of structural deformation of the underlying geology. Fourteen hand-dug well and four borehole points were proposed based on the ERT results. Conversely, the localised bedrock structures and oscillating bedrock topography were suggestive of potential threats to the foundations of engineering structures in the studied area. Reinforcement of concrete foundations at certain sites where ERT suggested that the underlying strata were not capable of bearing loads was recommended as well. This study has offered a detailed understanding of the subsurface geological disposition for sustainable groundwater development and siting of durable civil engineering structures in the studied area and other areas with typical complex geological settings.

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Section: Introductionmentioning

confidence: 99%

Subsurface geological, hydrogeophysical and engineering characterisation of Etioro-Akoko, southwestern Nigeria, using electrical resistivity tomography

Akingboye

Osazuwa

2021

NRIAG Journal of Astronomy and Geophysics

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“…As concerns the time-lapse geophysical survey, few studies were performed for monitoring recharge in vadose zone using TL-ERT [2,3]; time-lapse tracer and Self-potential measurements to characterize the hydrodynamics of fractured granite aquifer in southern India [63]; timelapse SP and ERT to map old mine working across railway track in a coalfield [79].…”

Section: Time-lapse Monitoring Of Contamination: Applications and Pro...mentioning

confidence: 99%

Tracking contaminant transport using time-lapse geophysics: A review on applications of electrical methods

Rani

Cassiani

2022

Water Security

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“…As a result, soil-rock interface, in conjunction with other lithological properties, is vital in understanding subsurface geodynamics, environmental and ecological processes, and the impacts of natural and anthropogenic-driven changes on the ecosystems (Chalikakis et al, 2011;Cheng et al, 2019;Akingboye and Bery, 2021a;Akingboye et al, 2022a). It is also relevant in evaluating water-rock interaction Bucher, 2015a, 2015b), groundwater potential (Arora et al, 2016;Gao et al, 2018;Christensen et al, 2020), and groundwater aquifers' vulnerability (Akintorinwa et al, 2020;Hasan et al, 2020;Akingboye et al, 2022b).…”

Section: Introductionmentioning

confidence: 99%

Combined ERT and borehole logs for mapping the soil-rock interface in a granitic environment

Akingboye

Bery

2022

Geofizika (Online)

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This study used the efficiency of electrical resistivity tomography (ERT) and borehole logs to map the soil-rock interface beneath four traverses (RS1, RS2, RS3, and RS4) in the granitic terrain of Perak, Peninsular Malaysia. The study aimed to evaluate the impacts of the soil-rock characteristic features and interfaces on groundwater and infrastructure development to meet the needs of the increasing inhabitants yearly. The borehole- and ERT-derived lithologic units are strongly correlated. The delineated lithologic units include the topsoil, weathered granitic units (medium stiff to hard silty clay or clayey silt with <800 Ωm), thin to wide-sized weathered/fractured units, and fresh granitic bedrock. These soil-rock profiles and weathered/fractured apertures support sustainable groundwater developments with drill depths above 45 m. In contrast, the delineated clay/silt alternating with stiffer soils, low load-bearing deep-weathered/fractured zones, and bedrock boulders in most places, except beneath traverse RS3, have high affinities for water retention and differential stresses. These features can adversely impact poorly reinforced foundations. Hence, structural elements of the foundations, such as footings or piles, should be placed on stable bedrock, particularly in the central to western parts of the study area. This study has reduced the paucity of information on using ERT and borehole logs for soil-rock interface studies in the study area.

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Non-intrusive hydro-geophysical characterization of the unsaturated zone of South India-A case study

Cited by 6 publications

References 36 publications

Subsurface geological, hydrogeophysical and engineering characterisation of Etioro-Akoko, southwestern Nigeria, using electrical resistivity tomography

Subsurface geological, hydrogeophysical and engineering characterisation of Etioro-Akoko, southwestern Nigeria, using electrical resistivity tomography

Tracking contaminant transport using time-lapse geophysics: A review on applications of electrical methods

Combined ERT and borehole logs for mapping the soil-rock interface in a granitic environment

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