A comparative study of four vulnerability mapping methods in a detritic aquifer under mediterranean climatic conditions |
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| Authors: | M Draoui J Vias B Andreo K Targuisti J Stitou El Messari |
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| Institution: | (1) Geology Department, Faculty of Science, University Abdelmalek Essaadi, P.O. Box 2121, 93002 Tetouan, Morocco;(2) Department of Geography, Faculty of Philosophy and Letters, University of Malaga, 29071 Malaga, Spain;(3) Department of Geology, Faculty of Science, University of Malaga, E 29071 Malaga, Spain |
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| Abstract: | This paper presents the results of a comparative study relating to the application of four vulnerability mapping methods,
GOD, AVI, DRASTIC and SINTACS, in a pilot detritic aquifer situated in NW Morocco, known as the Martil–Alila aquifer. The
principal objective of this work is to determine the most suitable such methods for this aquifer type within a Mediterranean
context, and to show the effect of the rainfall variations that are characteristic of the Mediterranean climate on the degree
of vulnerability. The methods applied distinguish five classes of vulnerability, these being irregularly divided up in space,
with the division varying according to the method in question. The vulnerability maps obtained by the different methods strongly
suggest that the eastern half of the aquifer is more vulnerable to contamination than the western half, for all hydrological
situations. The effect of climatic conditions on the degree of vulnerability is well represented by the DRASTIC, according
to which the aquifer is moderately to strongly vulnerable during humid hydrological years and weakly to moderately vulnerable
during dry ones. For the other methods, this climatic effect is limited to the area occupied by the two predominant classes
(“High” and “Low” for GOD and “High” and “Moderate” for SINTACS) while it is null for AVI. In conclusion, DRASTIC appears
the most suitable for mapping the vulnerability to contamination of Mediterranean coastal detritic aquifers such as the Martil–Alila
aquifer. |
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| Keywords: | Detritic aquifer GOD AVI DRASTIC and SINTACS methods Vulnerability mapping Mediterranean climate |
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