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File:MéandresArtificialisationFleuvesFL.jpg

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Français : Les méandres sont peu à peu rectifiés et les fleuves barrés

les méandres et les bras-morts tendent à rapidement régresser puis disparaitre au profit de la rectification des canaux, depuis plus de 500 ans en Europe, avec diverses conséquences négatives :

  • accélération des flux d'eau, impliquant ;
  • inondations plus graves et plus fréquentes en aval
  • sécheresses accrues en amont.
  • aggravation de l'érosion, localement
  • perturbations écologique, avec fragmentation écopaysagère et dégradation de l'eau liée à l'artificialisation des berges, et souvent aux écluses et barrages associés à ces aménagements
  • moindre alimentation de la nappe phréatique, car la surface et souvent le volume total d'eau du cours des fleuves diminuent, alors que toutes choses égales par ailleurs, c'est la hauteur d'eau qui contrôle la vitesse de percolation (Loi de Darcy).
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current13:39, 4 February 2007Thumbnail for version as of 13:39, 4 February 20071,024 × 349 (64 KB)Lamiot (talk | contribs){{Information |Description= {{fr}} Les méandres sont peu à peu rectifiés et les fleuves barrés les méandres et les bras-morts tendent à rapidement régresser puis disparaitre au profit de la rectification des canaux, depuis plus de 500 ans en Eu

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