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Titre du document / Document title

The limestone aquifers of Malta: Their recharge conditions from isotope and chemical surveys

Auteur(s) / Author(s)

BAKALOWICZ Michel (1) ; MANGION John (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Hydrosciences, Université Montpellier II, cc MSE, 34095 Montpellier, FRANCE
(2) Water Resources Directorate. Molta Resources Authority, Millenia, Aldo Moro Road, Marsa LQA06, MALTE

Résumé / Abstract

The potable water supply in Malta is heavily dependent on groundwater. The two main aquifers, the Perched Aquifer and the Mean Sea Level Aquifer (MSLA), are vertically stacked and separated by impermeable formations. Groundwater is now being threatened by over-pumping and pollution. An isotope and chemical survey was undertaken on rain and groundwater to identify the recharge conditions and set new strategies for exploiting and protecting groundwater. The main results show that: (a) an elevation effect does not appear in rainwater δ18O, so that groundwater cannot be distinguished in either of the aquifers by means of stable isotopes, and (b) groundwater tritium content shows an old recharge of MSLA and a very long residence time. Tritium results look inconsistent with other data, suggesting a present day recharge split into two components: a rapid portion through fractures, and a slow portion through rock porosity which is dominant.

Revue / Journal Title

IAHS-AISH publication    ISSN  0144-7815   CODEN IAPUEP 

Source / Source

Congrès
Hydrology of Mediterranean and semiarid regions :   ( Montpellier, 1-4 April 2003 )
International conference on hydrology of the Mediterranean and semi-arid regions, Montpellier , FRANCE (01/04/2003)
2003  , no 278, pp. 49-54[Note(s) : XIII, 498 p., ] [Document : 6 p.] (5 ref.) ISBN 1-901502-12-0 ;  Illustration : Illustration ;

Langue / Language

Anglais

Editeur / Publisher

International Association of Hydrological Sciences, Wallingford, ROYAUME-UNI  (1973) (Revue)
IAHS Press, Wallingford, ROYAUME-UNI  (2003) (Monographie)

Mots-clés anglais / English Keywords

sedimentary rocks

;

carbonate rocks

;

Europe

;

Southern Europe

;

porosity

;

fractures

;

residence time

;

tritium

;

strategy

;

pollution

;

pumping

;

sea level

;

perched aquifers

;

ground water

;

water supply

;

surveys

;

stable isotopes

;

aquifers

;

limestone

;

Malta

;

Mots-clés français / French Keywords

Roche sédimentaire

;

Roche carbonatée

;

Europe

;

Europe Sud

;

Porosité

;

Fracture

;

Temps résidence

;

Tritium

;

Stratégie

;

Pollution

;

Pompage

;

Niveau mer

;

Nappe perchée

;

Eau souterraine

;

Approvisionnement eau

;

Levé

;

Isotope stable

;

Aquifère

;

Calcaire

;

Malte

;

Mots-clés espagnols / Spanish Keywords

Roca sedimentaria

;

Roca carbonatada

;

Europa

;

Europa Sur

;

Porosidad

;

Fractura

;

Tritio

;

Estrategia

;

Polución

;

Bombeo

;

Manto colgado

;

Agua subterránea

;

Conducción de agua

;

Isótopo estable

;

Calcáreo

;

Malta

;

Localisation / Location

INIST-CNRS, Cote INIST : 8967, 35400011735686.0080

Nº notice refdoc (ud4) : 15735064



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