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(1973) n°3 - Royal Academy for Overseas Sciences

(1973) n°3 - Royal Academy for Overseas Sciences

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Eric J. Wolanski. — The exploitation of fresh<br />

groundwater lenses floating over saline water<br />

<strong>for</strong> the case of arid areas *<br />

(Presented by Mr. I. de Magnée and A. Clerfayt)<br />

ABSTRACT<br />

The exploitation of fresh groundwater lenses floating over<br />

salt-water is considered <strong>for</strong> the case of arid areas against a background<br />

of basic models <strong>for</strong> the flow of density-stratified and<br />

miscible fluids in porous media. It is emphasised that these lenses<br />

are quite often the only local source of fresh water and<br />

that their contamination by salt-water encroachment can lead<br />

to important man-made pollution problems. It is suggested that<br />

the experience acquired in some recent analytical and field<br />

studies of salt-water intrusion into fresh groundwater aquifers<br />

may be successfully applied to find a solution to these problems.<br />

* * #<br />

RESUME<br />

L’exploitation de nappes lenticulaires d’eau douce flottant<br />

sur eaux salées est étudiée en zone aride, sur la base de modèles<br />

théoriques pour l’écoulement en milieux poreux de deux fluides<br />

miscibles stratifiés par densité.<br />

L’accent est mis sur le fait que ces lentilles sont souvent la<br />

seule ressource locale en eau douce et que leur contamination<br />

par mélange avec les eaux salées, mélange dû aux captages<br />

eux-mêmes, crée des problèmes importants de pollution artificielle.<br />

* See Bull, des séances, <strong>1973</strong>, fasc. 2, p. 392.

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