Vertical movements of boulders in a subnival boulder pavement at 2800 m a.s.l. in the Alps (France)

A. Pissart and B. Francou

Permafrost and Periglacial Processes, 1992, vol. 3, issue 3, 203-208

Abstract: Vertical movements of boulders within a subnival boulder pavement were measured at 2800 m a.s.l. in the Alps over a period of 10 years. It was demonstrated that some boulders are undergoing sinking and others upheaving. The upheaving occurs in autumn during ground freezing, while the sinking of boulders probably occurs in springtime when the ground temperature is below 0 °C under the snow patch. Les mouvements verticaux de blocs d'un dallage nival localisé à 2800 m d'altitude dans les Alpes françaises ont été mesurés pendant une dizaine d'années et ont montré que des blocs sortent du sol, tandis que d'autres s'enfoncent dans la boue. Les soulèvements resultent de l'apparition de glace de ségrégation en automne, tandis que l'enfoncement des blocs se produit vraisemblablement au printemps lorsque sous la plaque de neige la température du sol est de 0 °C.

Date: 1992
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Persistent link: https://EconPapers.repec.org/RePEc:wly:perpro:v:3:y:1992:i:3:p:203-208

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