Geoelectrical investigation for the assessment of groundwater conditions: a case study

G. R. Lashkaripour, M. Nakhaei

Abstract


An electrical resistivity survey involving Vertical Electrical Soundings (VES) was carried out in the Shooro
Basin in Southeast Iran in order to study groundwater conditions such as depth, thickness and aquifer boundaries.
Vertical electrical soundings by Schlumberger array were conducted in this area. The resistivity Schlumberger
soundings which have a maximum current electrode spacing (AB) ranging from 200 m to 600 m were
carried out at 207 positions in 19 profiles. Interpretation of these soundings indicates the presence of an alluvial
aquifer. This aquifer is divided into eastern and western parts by the Shooro River, which comprises a variable
thickness and resistivity of deposits. The average permeability coefficient and resistivity in the western part, especially
southwest is higher than the eastern part of the aquifer. Therefore, it seems that Shooro River follows a
fault zone in the region. The high resistivity of west part is due to the water quality and the existence of alluvial
fan with coarse grain materials. Low aquifer resistivities in the east are associated with finer materials and also
brackish water infiltration from the adjacent basin mainly in the central part of the aquifer. Furthermore, zones
with high yield potential have been determined in this research based on the resistivity data.

Keywords


electrical resistivity;sounding;roundwater condition;Shooro;Iran

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References


DOI: https://doi.org/10.4401/ag-3244
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X