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Quelle gestion durable des ressources en eau et du risque de penurie sur les petites îles ?

Thomas Chiron 1
1 LETG - Brest - Littoral, Environnement, Télédétection, Géomatique
LETG - Littoral, Environnement, Télédétection, Géomatique UMR 6554
Abstract : Freshwater resources of small islands as Breton islands are naturally restricted by hydroclimatic and hydromorphological conditions. The hypothesis that lack of freshwater could limit their economic development, namely touristic development, has often been mentioned in the bibliography. Results of investigations in archives and interviews of “local memories” underline how much water management constituted a main topic in Breton island history. That is testified by many references to the question, namely relative to conflicts of uses. Nowadays, freshwater question seems to be secondary to managers and islanders. For the last four decades, hydraulic equipments had actually been considerably improved in order to supply the increasing water demand due to tourism activity and the improvement of living standards.
Technico-economic analysis shows that such a structural effort has led to hydraulic oversizing and a relative overinvestment in comparison with regional and national figures. Nevertheless summer water shortage risk is not stemed yet for some islands that still remain vulnerable to the most important droughts, as in 2005 when Belle-Île faced its fourth water shortage since the 1950's. While integrating natural, human and infrastructural parameters, the proposed retrospective and prospective assesment of water shortage risk constitutes a new approach to analyse the sustainability of water policy on small islands, giving managers figures to make decisions.
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Submitted on : Wednesday, May 21, 2008 - 5:17:43 PM
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Thomas Chiron. Quelle gestion durable des ressources en eau et du risque de penurie sur les petites îles ?. Géographie. Université de Bretagne occidentale - Brest, 2007. Français. ⟨tel-00281315⟩

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