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It is well known that an empty hole in a glacier will fill in if it is more than some 15 to 20 m. deep, due to the rapid variation of strain rate with shear stress. It is pointed out that a water-filled hole or lake will tend to enlarge itself by the same mechanism, if it is more than 150 to 200 m. deep. This phenomenon is believed to be responsible for the periodical and complete emptying of some glacier lakes, such as has been reported for the Tulsequah Lake in British Columbia, and Graenalón and Grilmsvötn in Iceland.
Es ist wohlbekannt, dass sich ein leeres, mehr als 15–20 m. tiefes Loch in einem Gletscher von selbst schliesst; dies ist darauf zurückzuführen, dass die Deformationsgeschwindigkeit des Eises mit der Scherspannung sehr rasch ansteigt. Es wird gezeigt, dass sich ein mit Wasser gefülltes, mehr als 150–200 m. tiefes Loch auf Grund desselben Mechanismus von selbst vergrössert. Dieses Phenomän erklärt wohl die periodische and vollständige Leerung gewisser Gletscherseen, wie z.B. des Tulsequah Lake in Britisch Kolumbien, and des Graenalón and Grimsvöm in Island.
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