1887

Abstract

Summary

Sea saltwater influx into coastal aquifers, a phenomenon brought by the flow of seawater into freshwater aquifers, has long been recognised around the world. In this study, Geophysical surveys are carried out in the coastal area of Talesh-Mahaleh (North-eastern Rasht-Gilan Province of Iran) to study the time evolution of seawater contamination of the coastal aquifer, probably increased due to human impact. The study is based on a processing and integrated analysis of hydrogeological and geophysical data. In particular, in the September to March 2012, seasonal time-lapse electrical resistivity tomography (on 15 Dipole-Dipole profiles) has been carried out. The resistivity data were acquired with electrode spacing (a) of 25 m, and expansion factor (n) of 40. The interpretation of geophysical data made it possible to reconstruct a 4D model of the electrical resistivity of the aquifer, aimed at defining the extent and the boundaries of seawater intrusions. Furthermore, the execution of a series of high-resolution time-lapse electrical tomography and a correlation analysis between geophysical measures and, geological and hydrogeological data allowed specifying the effects of the salt concentration in the groundwater and the porosity and saturation degree of the geology formations on the time variations of the measured electrical resistivity.

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2015-09-06
2024-04-27
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References

  1. Abdalla, O.A.E., Ali, M., Al-Higgi, K., Al-Zidi, H., El-Hussain, I. and Al-Hinai, S.
    [2010] Rate of seawater intrusion estimated by geophysical methods in an arid area. Hydrogeology J., 18, 1437–1445.
    [Google Scholar]
  2. Al Barwani, A. and Helmi, T.
    [2006] Seawater intrusion in a coastal aquifer: a case study for the area between Seeb and Suwaiq in the Sultanate of Oman. Agric Mar Sci., 11, 55–69.
    [Google Scholar]
  3. Atakpo, E.A. and Ayolabi, E.A.
    [2009] Evaluation of aquifer vulnerability and the protective capacity in some oil producing communities of western Niger Delta. Environmentalist, 29, 310–317.
    [Google Scholar]
  4. Brunet, P., Clement, R. and Bouvier, C.
    [2010] Monitoring soil water content and deficit using Electrical Resistivity Tomography (ERT) a case study in the Cevennes area, France. J Hydrol, 380, 146–53.
    [Google Scholar]
  5. Cassiani, G., Godio, A., Stocco, S., Villa, A., Deiana, R. and Frattini, P.
    [2009] Monitoring the hydrologic behavior of a mountain slope via time-lapse electrical resistivity tomography. Near Surf. Geophys., 7, 475–86.
    [Google Scholar]
  6. Chambers, J.E., Gunn, D.A., Meldrum, P.I., Wilkinson, P.B., Ogilvy, R.D., Haslam, E., Holyoake, S. and Wragg, J.
    [2011a] Volumetric monitoring of earth embankment internal structure and moisture movement as a tool for condition monitoring. 11th int. conf. railway engineering, London.
    [Google Scholar]
  7. Chambers, J.E., Wilkinson, P.B., Kuras, O., Ford, J.R., Gunn, D.A. and Meldrum, P.I.
    [2011b] Three-dimensional geophysical anatomy of an active landslide in Lias Group mudrocks, Cleveland Basin, UK. Geomorphology, 125, 472–84.
    [Google Scholar]
  8. Chambers, J.E., Gunn, D.A., Wilkinson, P.B., Meldrum, P.I., Haslam, E., Holyoake, S.
    [2014] 4D electrical resistivity tomography monitoring of soil moisture dynamics in an operational railway embankment. Near Surf Geophys, 12(1), 61–72.
    [Google Scholar]
  9. Gemail, K.S., El-Shishtawy, A.M., El-Alfy, M., Ghoneim, M.F. and Abd El-Bary, M.H.
    [2011] Assessment of aquifer vulnerability to industrial waste water using resistivity measurements: A case study along El-Gharbyia main drain, Nile Delta, Egypt. J. Applied Geophysics, 75, 140–150.
    [Google Scholar]
  10. Loke, M.H.
    [2011] Electrical resistivity surveys and data interpretation. In Gupta, H. (ed.), Solid Earth Geophysics Encyclopaedia (2nd Edition), Electrical & Electromagnetic Springer, 276–283.
    [Google Scholar]
  11. Ogilvy, R.D., Meldrum, P.I., Kuras, O.A., Wilkinson, P.B. and Chambers, J.E.
    [2008] Advances in geoelectrical imaging technologies for the measurement and monitoring of complex earth systems and processes. 33rd int. geol. congress, Oslo.
    [Google Scholar]
  12. Sarkheil, H., and Hassani, H.
    [2009] A new design for geoelectric surveying and inverse 1D and 2D modeling: the case of Karongah lead-zinc mine, Kerman. 9th InternationalMultidisciplinary Scientific GeoConference, Bulgaria, 637–641.
    [Google Scholar]
  13. Shevnin, V., Mousatov, A., Ryjov, A. and Delgado-Rodriquez, O.
    [2007] Estimation of clay content in soil based on resistivity modelling and laboratory measurements. Geophys. Prospect., 55, 265–75.
    [Google Scholar]
  14. Sjödahl, P., Dahlin, T., Johansson, S. and Loke, M.H.
    [2008] Resistivity monitoring for leakage and internal erosion detection at Hällby embankment dam. J. Applied Geophysics, 65, 155–16.
    [Google Scholar]
  15. Sorensen, K.I., Auken, E., Christensen, N. and Pellerin, L.
    [2005] An integrated approach for hydrogeophysical investigations: New technologies and a case history. In: Bulter, D.K. (Ed.) Near-surface Geophysics. Tulsa, USA: Society of Exploration Geophysicists, 585–597.
    [Google Scholar]
  16. Vaudelet, P., Schmutz, M., Pessel, M., Franceschi, M., Guérin, R., Atteia, O., Blondel, A., Ngomseu, C., Galaup, S., Rejiba, F. and BégassatP.
    [2011] Mapping of contaminant plumes with geoelectrical methods: a case study in urban context. J. Appllied Geophysics, 75, 738–751.
    [Google Scholar]
  17. Younger, P.L.
    [2007] Groundwater in the environment: An introduction. Oxford OX4 2DQ, UK, Blackwell Publishing, 297.
    [Google Scholar]
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