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Erschienen in: Environmental Earth Sciences 5/2014

01.09.2014 | Original Article

Mapping groundwater conditions in different geological environments in the northern area of UAE using 2D earth resistivity imaging survey

verfasst von: A. M. Ebraheem, M. M. Al Mulla, M. M. Sherif, O. Awad, S. F. Akram, N. B. Al Suweidi, A. Shetty

Erschienen in: Environmental Earth Sciences | Ausgabe 5/2014

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Abstract

A water resources database was developed and used to characterize the geological and hydrogeological settings of groundwater aquifers in the northern part of the United Arab Emirates. An intensive 2D Earth Resistivity Imaging (ERI) survey was conducted in selected areas to assess the available groundwater resources and delineate the salt-water intrusion. Drilling information of the existing monitoring wells as well as their records of water table elevations and groundwater salinity were used to measure the horizontal and vertical variations in lithology, degree of saturation, and groundwater salinity and thus to improve the interpretation of ERI data. The results of the chemical analyses of water samples collected from the wells along with the 2D ERI survey profiles were used to obtain an empirical relationship between the inferred earth resistivity and the amount of total dissolved solids. This relationship was used along with the true resistivity sections resulting from the inversion of 2D ERI data to identify and map three zones of water-bearing formation (fresh, brackish, and salt-water zones) in the coastal areas. The results indicated that the depth to the fresh-brackish interface exceeded 50 m at the upstream of the wadies and was in the order of 10 m or less in the vicinity of shoreline. Because of the high resistivity contrast between dry and water saturated fractured rocks; this method was very successful in detecting water-filled fractures and cavities in the carbonate aquifer. The application of this method was unsuccessful in clayey aquifers as it was not possible to isolate lenses of gravel and/or saturated with saline or brackish water from the surrounding clayey materials.

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Metadaten
Titel
Mapping groundwater conditions in different geological environments in the northern area of UAE using 2D earth resistivity imaging survey
verfasst von
A. M. Ebraheem
M. M. Al Mulla
M. M. Sherif
O. Awad
S. F. Akram
N. B. Al Suweidi
A. Shetty
Publikationsdatum
01.09.2014
Verlag
Springer Berlin Heidelberg
Erschienen in
Environmental Earth Sciences / Ausgabe 5/2014
Print ISSN: 1866-6280
Elektronische ISSN: 1866-6299
DOI
https://doi.org/10.1007/s12665-014-3064-5

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