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Annales de Limnologie - International Journal of Limnology (1)

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Rôle des lacs de gravières dans la diminution des teneurs en nitrates des aquifères alluviaux de la vallée de la Garonne. Essai de quantification
J. Labroue, J. N. Tourenq, C. Mieussens, J. Robert, B. Donville
Journal:

Annales de Limnologie - International Journal of Limnology / Volume 24 / Issue 1 / 1988

Published online by Cambridge University Press:

15 August 2009, pp. 31-38

Print publication:

1988
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L'établissement du bilan des entrées et sorties de nitrates dans quelques lacs de gravières ainsi que la mesure directe de la dénitrification par émission de N2O (méthode à l'acétylène) ont permis d'évaluer l'activité dépolluante de ces lacs vis-à-vis de la nappe phréatique de la Garonne.L'activité dénitrifiante la plus élevée a été mesurée dans un lac ancien, non colmaté, artificiellement eutrophisé. Par contre, les gravières anciennes colmatées sont sans effet.Des surfaces considérables de plan d'eau sont nécessaires afin d'épurer des débits suffisants en vue de l'alimentation des captages d'eau potable.