Impacts Of Morphological Factors On The Marine Intrusion In Annaba ...

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Impacts of morphological factors on the marine intrusion in
Annaba region (east of Algeria)
Larbi Djabria, Lassaad Ghriebb,*, Noureddine Guezgouza, Azzedine Hania,
Saad Bouhsinac
aDepartment of Geology, University of Badji Mokhtar, Annaba, Algeria
bDepartment of Biology, Guelma University, Annaba, Algeria
Email: ghrieblassaad@yahoo.fr
cDepartment of Chemistry, Littoral Dunkerque University, Dunkerque, France
Received 7 December 2012; Accepted 15 May 2013
ABSTRACT
Annaba is famous as an agricultural region. The main crops are water melon and tomatoes.
These crops grow in the summer, thus need intensive irrigation that requires an overexploitation of water, which leads to an imbalance of freshwater–saltwater interface. To explain the
marine intrusion and its extension, we examined the information given by geomorphologic,
hydrochemistric and hydrodynamic studies. The studied area is characterized by horst and
graben structures. The effects well localized of those faults allow to explain the presence of
preferential areas of flow. The calculated ratio values were compared to critical level values
(Mg/Ca= 4.5, SO4/Cl = 0.1 and Cl
-/conductivity < 0.30). The obtained results show that the
ratio values are over the limits, presenting a possible marine intrusion. This intrusion could
particularly be from the Salines, regions in the North to Besbes in the South, which explains
the water’s salinity in this region, despite its distance from the sea.
Keywords: Salinity; Water; Fresh water–salted water interface; Bromine
1. Introduction
Although the marine intrusion is linked to the
overexploitation of the coastal groundwater aquifers,
we must recognize that other factors could contribute
directly or indirectly to the increase of salt wedge [1].
The work done in the studied area showed that the
local morphology could lead to marine intrusion in
the zones far from the littoral.
The present work is based on collecting and combining specific data or information in order to explain the
mechanisms controlling marine intrusion in this zone.
The plain of Annaba is bordered from the north by
the Mediterranean Sea. It contains two groundwater
aquifers of unequal extensions: The first, called superficial and in which implanted domestic wells, is
located at few meters of the surface. The second, called
deep, is reached by drillings of over 100 meters deep.
The studied region has an agricultural vocation. The
cultivated summer crops are mainly tomatoes, melon
and water melon. These crops need intense irrigation*Corresponding author.
Presented at the 6th International Conference on Water Resources in Mediterranean Basin (WATMED6), 10–12
October 2012, Sousse, Tunisia
1944-3994/1944-3986  2013 Balaban Desalination Publications. All rights reserved.
Desalination and Water Treatment
www.deswater.com
doi: 10.1080/19443994.2013.808585
52 (2014) 2151–2156
February

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