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Une remontée de la mer d'Aral ?

L'image du mois - juillet 1999

La mer d'Aral a vu son niveau baisser depuis les années 60, à cause de la grande quantité d'eau prélevée en amont dans les deux fleuves qui l'alimentent (le Syr Daria et l'Amu Daria) pour l'irrigation des champs de coton. À tel point que les côtes ont reculé de plus de 120 km à certains endroits, et que la mer d'Aral s'est séparée en deux bassins, la Grande et la Petite Aral, chacun alimenté par un fleuve.

Depuis 1996, cependant, on assiste à une remontée du niveau de la Petite Aral, probablement due à la contruction d'une digue séparant les deux bassins. La Grande Aral, par contre, continue à descendre.

Les satellites comme Topex/Poséidon suivent le niveau des mers en continu et sur le long terme, et permettent donc de surveiller les variations de ce niveau

Voir aussi :

  • Applications : La mer d'Aral (page mise à jour régulièrement)

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