Saltwater intrusion modelling in Jorf coastal aquifer, South-eastern Tunisia: geochemical, geoelectrical and geostatistical application
Article first published online: 16 APR 2012
Copyright © 2012 John Wiley & Sons, Ltd.
Volume 27, Issue 8, pages 1191–1199, 15 April 2013
How to Cite
Agoubi, B., Kharroubi, A. and Abida, H. (2013), Saltwater intrusion modelling in Jorf coastal aquifer, South-eastern Tunisia: geochemical, geoelectrical and geostatistical application. Hydrol. Process., 27: 1191–1199. doi: 10.1002/hyp.9207
- Issue published online: 1 APR 2013
- Article first published online: 16 APR 2012
- Accepted manuscript online: 19 JAN 2012 09:48PM EST
- Manuscript Accepted: 13 JAN 2012
- Manuscript Received: 19 SEP 2011
- saltwater intrusion;
- coastal aquifer;
Marine intrusion is the most serious problem facing the coastal Jorf shallow aquifer, located in south-eastern Tunisia on the Mediterranean Sea. Jorf Aquifer is intensively exploited to supply the growing needs of agriculture and domestic sectors. This work proposes a multidisciplinary investigation, involving hydro-geochemical, geoelectrical survey and geostatistical techniques for modelling the saltwater intrusion. For this purpose, 36 water samples were conducted and analysed. Electric conductivity, pH, total dissolved solids and major ions were measured and analysed. Pie and Durov Diagrams, Q-mode hierarchical cluster and geostatistical analysis were considered to identify the main groundwater mineralization processes. Results revealed that the Na-Cl-Ca-SO4 is the dominant water type suggesting that dissolution of halite and gypsum was the main mineralization source of groundwater in the central and southern part of study area. However, saltwater intrusion was shown to control groundwater quality essentially in coastal areas. Variographic analyses were used to select the variographic model that best fits the spatial development of apparent resistivity. Kriged apparent resistivity profiles showed an abnormal decrease of resistivity values in the coastal zone, implying highly saline water because of seawater intrusion. Apparent resistivity values also decrease considerably in the faulted areas, suggesting a contribution of faults to seawater intrusion. Finally, saltwater mixing ratio was computed for each sample, and a refined seawater intrusion map was developed. Copyright © 2012 John Wiley & Sons, Ltd.