Geology Reference
In-Depth Information
NO
3
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DOC
Figure 75
Dilution of reservoir tracers and increase in superfi cial tracers during a discharge
peak.
6.1.3 Recharge components
a) Example of the Souss aquifer
(Morocco, Hsissou
et al.,
1999)
The complex Souss aquifer (Agadir) is in contact with the Ocean, but is
also fed by infi ltration from the wadis (rivers) issuing from the Western
High-Atlas mountains. These wadis drain gypsiferous terrain (Cretaceous)
and saliferous terrain ( Triassic). Water of marine origin (current salt water
intrusion, sedimentary paleosalinity, marine rainy spindrift) is located along
the line of “dilution” of seawater (Figure 76).
Water originatin in evaporites (gypsum, halite) or from anthropogenic
use (infi ltrated wastewater) can be identifi ed by a lower concentration in
bromide. This bromide content, compared to the chloride content, thus
allows the mapping of recharge zones in the aquifer.
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