DOI: 10.5593/SGEM2015/B13/S5.107


F. Chitea, D. Ioane, A. Serban
Friday 7 August 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-33-9 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 3, 823-830 pp

Geophysical prospection for groundwater resources has several distinctive tasks, depending on the objectives: mapping a known water bearing structure, location of new spring or groundwater quality.
The groundwater resources are extremely diversified: naturally enriched in salts or other minerals, naturally acidified (pH<5) or with excess of basicity, cold (<200C) or with increased temperature (hypothermal, thermal and hyperthermal).
The use of the geophysical non-invasive techniques for groundwater investigation reduces the risk of drilling dry holes or to reach a certain type of water which is not of the particular interest (for example reaching cold water resource when the target is a hot water, or finding low mineralized water when the desired resource is a saline spring).
Thus, it is very important to analyse the groundwater properties and to correlate them with the properties that can be investigated by non-invasive geophysical methods.
In this paper the focus will be on groundwater parameters diversity, using as a main feature the electrical conductivity. The selection of this parameter is justified by the possibility of being tracked also by two indirect investigation methods: geoelectric and electromagnetic prospection. The approach is directed to observe the spatial but also the temporal water chemistry variation as reflected in several parameters that can be determined without expensive or time demanding laboratory analyses: electrical conductivity, hydrogen ion concentration (pH) and total dissolved solids (TDS that can be determined from electrical conductivity (σ), using TDS-meters or by computing the total dissolved components concentrations).

Keywords: groundwater geophysics, water electrical properties, hydrogeophysics, hydrothermal springs