Geophysical and hydrogeologic investigation of groundwater in the Karoo stratigraphic sequence at Sawmills in northern Matabeleland, Zimbabwe: a case history

Danielsen, Jens; Dahlin, Torleif; Owen, Richard; Mangeya, P.; Auken, Esben

doi:10.1007/s10040-007-0191-z

Cited by 31 publications

(17 citation statements)

References 34 publications

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“…However, the relationship between separation and depth is a function of the electrical structure. In general, the depth of penetration is small with this method, and only shallow subsurface layers have been surveyed [24].…”

Section: Materials and Methodologymentioning

confidence: 99%

Delineation of the Aquifer in the Curin Basin, South of Zahedan City, Iran

Nejad¹

2012

TOGEOJ

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Resistivity method using 596 Schlumberger vertical electrical soundings along 26 profiles are conducted in the Curin basin, Iran to investigate the sub-surface layering and aquifer characteristics. The results of quantitative and qualitative interpretation of data reveal four layers. The true resistivity of the top soil varies from 3 to 800 ohm-m while the thickness varies from 0.5-15 m. The second layer (dry alluvium) is thicker than the surface layer with resistivity values less than 100 ohm-m. The third layer, which constitutes an aquifer, has resistivity values of less than 10 ohm-m and depth values of less than 30 m in most locations. The maximum depth of aquifer is 60 meters in the northwest and southeast portion of the study area. The fourth layer (bedrock) is characterized by two electric resistivity values ranges. In most parts of the area, it is more than 60 ohm-m, corresponding probably to slate, while in other areas, it is less than 60 ohm-m, corresponding probably to shale. Finally from the quantitative interpretation of VES curves, the limits of the aquifer were determined.

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Section: Materials and Methodologymentioning

confidence: 99%

Delineation of the Aquifer in the Curin Basin, South of Zahedan City, Iran

Nejad¹

2012

TOGEOJ

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“…One way of addressing water quality concerns is to use the transient electromagnetic (TEM) method to identify water quality variations in potential aquifers (Melloul and Goldenberg 1997;Land et al 2004;Ezersky et al 2011). In the last few decades, TEM has been developed and used extensively around the globe to identify fresh water aquifers, delineate saltwaterfreshwater interfaces, and map the spatial extent of salty groundwater (Guerin et al 2001;Auken et al 2003;Danielsen et al 2007;Levi et al 2008;Boucher et al 2009;Bauer-Gottwein et al 2010;Herckenrath 2012;Nenna et al 2013). Large-scale airborne geophysical mapping in the Okavango Delta, conducted by the Government of Botswana, has played a major role in the understanding of the groundwater system of the Kalahari Basin (Campbell et al 2006;Kgotlhang 2008;Podgorski et al 2013a).…”

Section: Introductionmentioning

confidence: 99%

Airborne and ground‐based transient electromagnetic mapping of groundwater salinity in the Machile–Zambezi Basin, southwestern Zambia

Chongo

Christiansen

Tembo

et al. 2015

Near Surface Geophysics

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21The geological and morphological evolution of the Kalahari Basin of Southern Africa has 22 given rise to a complex hydrogeological regime that is affected by water quality issues. 23Among these concerns is the occurrence of saline groundwater. Airborne and ground-based 24 electromagnetic surveying is an efficient tool for mapping groundwater quality variations and 25 has been used extensively to explore the Kalahari sediments, e.g., in Botswana and Namibia. 26 Recently, airborne-and ground-based mapping of groundwater salinity was conducted in the 27 Machile-Zambezi Basin, southwestern Zambia, using the versatile time-domain 28 electromagnetic system and WalkTEM system, respectively, incorporating earlier ground-29 based ProTEM 47D measurements. The data were inverted using the laterally constrained

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“…Resistivity generally increases as porosity decreases and vice versa. Several authors have therefore delineated shallow aquifers and estimated aquifer hydraulic parameters using surface geophysical methods in different parts of the world [2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Delineation of Shallow Aquifers of Umuahia and Environs, Imo River Basin, Nigeria, Using Geo-Sounding Data

Ugada¹,

Opara²,

Emberga³

et al. 2013

JWARP

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This work was undertaken to study the hydrogeophysical characteristics of Umuahia and environs, Imo River Basin using geophysical data. Thirty (30) vertical electrical sounding data with a maximum electrode spacing of (AB/2) of 500 meters were acquired using the Schlumberger electrode configuration. The VES data were interpreted using the conventional partial curve matching technique to obtain initial model parameters, which were used as input for computer iterative modelling using the OFFIX software. The study revealed three (3) to six (6) geo-electric layers with underlying shale beds. Aquifer apparent resistivity in the study area ranges from about 50 to 850 Ωm with the aquifer depth varying between 0.53 -82.67 m. Similarly, the aquifer thickness in the study area ranges from 0.8 -110 m, with very low thicknesses around Ajata Ibeku. These shallow aquifers with very small thicknesses in the western areas around Ajata Ibeku are believed to be perched or fractured shale units with very low or no yield. Finally, transverse resistances in the study area range from 200 -3400 Ωm 2 with low values in the western part. Information extracted from iso-resistivity models, geoelectric cross sections, litho logs and electric logs revealed a sandy clay lithology at very shallow depths with a thick layer of shale/clay extending to over 300 m within the western part. These shallow aquiferous units are however perched, partially saturated and may not have sufficient yield. Finally, this study has helped to delineate the aquifers of the study into two distinct zones, thus revealing a groundwater divide.

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Geophysical and hydrogeologic investigation of groundwater in the Karoo stratigraphic sequence at Sawmills in northern Matabeleland, Zimbabwe: a case history

Cited by 31 publications

References 34 publications

Delineation of the Aquifer in the Curin Basin, South of Zahedan City, Iran

Delineation of the Aquifer in the Curin Basin, South of Zahedan City, Iran

Airborne and ground‐based transient electromagnetic mapping of groundwater salinity in the Machile–Zambezi Basin, southwestern Zambia

Delineation of Shallow Aquifers of Umuahia and Environs, Imo River Basin, Nigeria, Using Geo-Sounding Data

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