Influence of extreme rainfall events on an unconfined coastal aquifer (Chaouia, Morocco)
In: 705412ar ; 10.7202/705412ar ; 2149819464 ; oai:erudit.org:705412ar ; 10|openaire____::081b82f96300b6a6e3d282bad31cb6e2 ; 10|issn___print::130cf49e979129942002da43f89d0654, 2005
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Zugriff:
A study of regional pollution in the coastal aquifer system between Oum-er-Rbia River and Bir Jdid (Coastal Moroccan Meseta, Morocco) was based on data gathered from 1995 to 1998. The study improved the hydrogeological and hydrochemical understanding of the aquifers. The study examined the effects of significant rains on the quantity and quality of coastal groundwater. These waters exhibited high sensitivity to the rain input.Measurements undertaken since 1991 on 179 wells in the study area reveal that the groundwaters are highly mineralized - conductivity reaches more than 10 mS/cm, depending on season and well location. These results also show high chloride concentrations (more than 3500 mg/l), sodium concentrations frequently in the 500 - 1000 mg/l range and nitrates between 150 and 250 mg/l.In coastal Chaouia, these high concentrations of dissolved mineral salts aggravate the problem of supplying quality water to the rural population for drinking or even market-gardening irrigation purposes. The area is characterized by increased irrigated surfaces (more than 16000 hectares with 4125 m3 /s) and a demographic rise that has triggered the chaotic boring of more than 2000 wells into a heterogeneous aquifer sensitive to salinity. Possible sources of this high salinity include :Seawater intrusion into coastal aquifer sectors (mainly into a two-kilometre strip of coastline). The degree and the length of the marine intrusion were exacerbated by intensive pumping for irrigation needs, particularly during the dry season. Other factors such as coastal aquifer permeability, saturation zone thickness and basement depth also affect the degree and length of the marine intrusion. Seawater pollution is more marked in the southwestern coastal area.Reuse of irrigation saline waters, especially as groundwater circulates in the coastal and eastern sectors deep in the soil (to depths of 10 m).Several important factors have been highlighted concerning the origin of the chemical elements in solution and the mechanism of ...
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Influence of extreme rainfall events on an unconfined coastal aquifer (Chaouia, Morocco)
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Autor/in / Beteiligte Person: | Younsi, A. ; Lhadi, E. K. ; Mudry, Jacques ; Mania, J. |
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Zeitschrift: | 705412ar ; 10.7202/705412ar ; 2149819464 ; oai:erudit.org:705412ar ; 10|openaire____::081b82f96300b6a6e3d282bad31cb6e2 ; 10|issn___print::130cf49e979129942002da43f89d0654, 2005 |
Veröffentlichung: | Consortium Erudit, 2005 |
Medientyp: | academicJournal |
DOI: | 10.7202/705412ar |
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