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Alternative vertical electrical sounding technique for hydraulic parameters estimation of the quaternary basaltic aquifer in Deir Al Adas area, Yarmouk Basin, Southern Syria

Asfahani J., Al-Fares W.

Acta Geophysica

2021

Vol. 69, no. 5

1901--1918

An alternative geoelectrical approach, based on using the technique of vertical electrical sounding (VES), is developed and proposed to estimate the hydraulic conductivity and transmissivity parameters of the quaternary fractured basalt aquifer (B1Q1) in Deir Al-Adas region, Southern Syria. Nineteen VES points were executed by Schlumberger configuration, where three of them were made near the available boreholes for comparison. Hydraulic conductivity and transmissivity aquifer parameters are obtained by analyzing conjointly the available pumping test results from the existing boreholes and the electrical Dar-Zarrouk (R) parameters from VES data. An empirical equation between the transverse resistance (R), resulting from VES interpretation, and hydraulic conductivity determined from pumping test is established to estimate geophysically hydraulic conductivity of the Quaternary basalt aquifer. A closed agreement is obtained between the computed hydraulic conductivity and the one determined from pumping test. The established calibrated relationship is consequently used to extrapolate and estimate the transmissivity and the hydraulic conductivity parameters in all VES points, where geoelectrical measurements have been carried out. This extrapolation allows characterizing and deriving the spatial maps of hydraulic conductivity, transmissivity and other related hydrogeophysical parameters in the study area. The integrated acquired results give insights, particularly on the groundwater potentiality of the study region, direction of groundwater flux, and plausible lava directions flux. The resulting maps are important in future modeling processes oriented towards better exploiting of the aquifers. The proposed alternative technique is successfully applied in the study area and can be therefore applied for studying similar basaltic environments worldwide.

Using Vertical Electrical Soundings for Characterizing Hydrogeological and Tectonic Settings in Deir El-Adas Area, Yarmouk Basin, Syria

Al-Fares W.

Acta Geophysica

2016

Vol. 64, no. 3

610--632

The present study is aimed at characterizing the subsurface geological and tectonic structure in Deir El-Adas area, by using Vertical Electrical Sounding survey (VES) and hydrogeological investigations, in order to determine the causes of the failure for the majority of the wells drilled in the area. The survey data was treated in three different approaches including direct VES inversion, pseudo-2D method and horizontal profiling, in order to maximize the reliability of the data interpretation. The results revealed the presence of a local faulted anticline structure at the top of the Paleogene formation, underneath the basaltic outcrops where Deir El-Adas village is situated. The appearance of this subsurface anticline structure has complicated the local hydrogeological situation, and most likely led to limitation of the groundwater recharge in the area. Moreover, the performed piezometric and discharge maps indicated the presence of a notable groundwater watershed, in addition to feeble water productivity of the wells drilled adjacent to Deir ElAdas, mostly related to the subsurface geological and tectonic settings in the area.