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2005 Salt Lake City Annual Meeting (October 16–19, 2005)

Paper No. 5
Presentation Time: 1:30 PM-5:30 PM

ESTIMATION OF THE PHENOMENON OF RECHARGE AND EVAPORATION OF GROUND- WATERS UNDER SEMI-ARID CONDITIONS -PLAIN OF TAFILALT - SOUTH OF MOROCCO


NAIMA, Safsaf1, SAIDATY, Bouhlassa2, MOHAMED, Ibn Majah1 and HAMID, Marah1, (1)isotopic analysis unit, National Center of Energy Sciences and Nuclear Techniques - Rabat - Morocco, Rabat, 10001, Morocco, (2)Faculty of Siences, Radiochemistry unit, Rabat, 10001, Morocco, safsaf@cnesten.org.ma

The study proposes to define two essential parameters in the quantification of the recharge of the subsurfacic aquifer and or deep of Tafilalt : The evaporation and the effective infiltration rate.

The area of study, located in the Saharan borders, to the south of the high atlas, extends on more than one thousands of km2; this area knows an arid climate (less than 100 mm per year of precipitation) doubled of an irregular pluviometry. Since the construction of the stopping Hassan ED Dakhil upstream of the area which deprived Tafilalt of water of the Ziz oued, an artificial recharge is assured by intermittent lâchers water of the stopping.

The isotopic and chemical study of the soil profile in the unsaturated soil of approximately 6,5m shows that with the top a depth of approximately 111mm, water is taken again under the effect of evaporation. According to Barnes and Allison, the modeling of the phenomenon has provided an evaporation rate estimate of 7mm/year.

Session No. 192--Booth# 73

T24. Naturally Occurring Perchlorate (and Other Oxyanions) in the Hydrologic Cycle—Origins, Accumulation, Transformations, and Transport (Posters)
Tuesday, 18 October 2005: 1:30 PM-5:30 PM
Geological Society of America Abstracts with Programs. Vol. 37, No. 7, p.434
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