Bédière

Vue aérienne d'une bédière à la surface d'un glacier au Groenland.
Bédières sur le glacier d'Aletsch en Suisse.

Une bédière est un torrent parcourant la surface d'un glacier et alimenté par les eaux de fonte et/ou de pluie.

Les bédières peuvent donner naissance à des torrents de montagne lorsqu'elles arrivent au front glaciaire ou bien peuvent s'engouffrer dans un moulin et rejoindre l'intérieur du glacier. Le débit d'une bédière peut être très variable, pouvant aller du simple filet d'eau à celui d'une véritable rivière.

On les rencontre sur tous les types de glaciers mais les plus grandes se trouvent sur les inlandsis et les calottes glaciaires.

Le terme provient du latin bediara dérivant lui-même du mot gaulois bedo signifiant « canal ».

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