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

Al-Fares W.

Acta Geophysica

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2016

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Vol. 64, no. 3

610--632

EN

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.

2

Znaczenie badań źródeł dla rozpoznania warunków hydrogeologicznych na przykładzie zlewni Olszowego Potoku i Turbacza (Gorce)

Stępień M., Stożek J.

Biuletyn Państwowego Instytutu Geologicznego

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2013

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nr 456 Hydrogeologia z. 14/2

569--574

PL

W wyniku kartowania krenologicznego w zlewniach Olszowego Potoku i Turbacza udokumentowano przestrzenną dywersyfikację właściwości fizycznych i chemicznych wód podziemnych oraz ich składu chemicznego, które są efektem zróżnicowania głębokości krążenia wód podziemnych, odmiennej litologii skał podłoża, rzędnej wypływu, a także sezonu poboru próbek. Wyodrębniono trzy typy hydrochemiczne wód podziemnych, które prawdopodobnie można wiązać z występowaniem różnych reżimów hydrogeologicznych.

EN

The spatial diversification of the chemical and physical properties of groundwater and their chemical composition was documented in the studied catchments as a result of spring investigation. This is due to the depth of groundwater circulation, different bedrock lithology, spring elevation, and a season of sampling. Three types of groundwater were distinguished which probably are associated with the occurence of different hydrogeological regimes.

3

Groundwater investigation on sand dunes area in southern part of Vietnam by magnetic resonance sounding

Giang N.V., Nam T.D., Bano M.

Acta Geophysica

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2012

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Vol. 60, no. 1

157-172

EN

In the last five years, magnetic resonance sounding (MRS), as a non-invasive geophysical method, has emerged as a new technique for ground water investigation in Vietnam. In this paper, we present the general theoretical basis of this method together with acquisition, processing, and interpretation of the MRS data. We show a case study of MRS surveys in sand dunes area in order to characterize aquifers situated in the southern part of Vietnam. From the interpretation of MRS soundings we delimited an aquifer layer in the subsurface with strong lateral variations for which we determined the depth at 44 m and water content between 3 per cent and 9.5 per cent. The longitudinal relaxation constant T*1 is about 250 m s, while the transverse relaxation T*2 is between 150–200 m s. That indicates fine to medium grain size and thus low to medium hydraulic permeability. These results are confirmed by the observations from the well LK1 between 45 to 70 m. The results of other MRS measurements showed the presence of a low water bearing aquifer and were confirmed by the observations in two other wells.