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Estimation of the hydraulic parameters by using an alternative vertical electrical sounding technique: case study from semiarid Khanasser valley region, Northern Syria

Asfahani Jamal

Acta Geophysica

2023

Vol. 71, no. 2

997--1013

Vertical electrical sounding technique (VES) is proposed as an alternative geoelectrical approach to estimate the hydraulic conductivity and transmissivity parameters related to the Quaternary aquifer of semiarid Khanasser valley, Northern Syria. Schlumberger array is used for carrying out the VES measurements, where three of them were made just near three existing boreholes for comparison. The conjoint analysis of the pumping tests results from the available three drilled boreholes, and the geoelectrical Dar-Zarrouk of transverse resistance (R) and longitudinal conductance (S) parameters resulted from VES interpretations allows to obtain the both parameters of the hydraulic conductivity and transmissivity Quaternary aquifer. Empirically calibrated relationship between hydraulic conductivity evaluated by using the available pumping test results and the transverse resistance (R) of the Quaternary aquifer is derived for those three boreholes. A very good agreement is noticed between the measured hydraulic conductivity from pumping tests and the one computed geophysically. The constructed calibrated relationship is thereafter applied to extrapolate and estimate both the hydraulic conductivity and the transmissivity parameters in thirty-four measured VES points in the Khanasser valley study area. Such an extrapolation allows deriving and characterizing the spatial variation maps of hydraulic conductivity and transmissivity in the study area. The acquired geophysical results give useful information, particularly on the groundwater potentiality of the study region. The developed alternative approach is successfully applied in the study area and can therefore be practiced for characterizing similar semiarid environments worldwide.