Essai de quantification de la déflation en milieu subpolaire, (Skeiðarársandur, Islande).

National audience The Skeiðarársandur is a large glaciofluvial plain in the south of the Vatnajökull ice cap. In November 1996, a jökulhlaup triggered by a subglacial eruption and produced a catastrophic flood which incised the Skeiðarársandur. Those incised channels trap currently part of the wind...

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Bibliographic Details
Main Author: Roussel, Erwan
Other Authors: Laboratoire de Géographie Physique et Environnementale (GEOLAB), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université Clermont Auvergne 2017-2020 (UCA 2017-2020 )-Université Clermont Auvergne (UCA)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Maison des Sciences de l'Homme de Clermont-Ferrand (MSH Clermont), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Centre National de la Recherche Scientifique (CNRS)
Format: Article in Journal/Newspaper
Language:French
Published: HAL CCSD 2007
Subjects:
Iceland
catabatics winds
Islande
Deflation rate
Vitesse de déflation
vents catabatiques
Skeiðarársandur
[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology
Vatnajökull
Ice cap
Online Access:https://hal.archives-ouvertes.fr/hal-00449479
https://hal.archives-ouvertes.fr/hal-00449479/document
https://hal.archives-ouvertes.fr/hal-00449479/file/Roussel_Env_peri_2007.pdf
Description
Summary:National audience The Skeiðarársandur is a large glaciofluvial plain in the south of the Vatnajökull ice cap. In November 1996, a jökulhlaup triggered by a subglacial eruption and produced a catastrophic flood which incised the Skeiðarársandur. Those incised channels trap currently part of the wind transport (essentially the transport by saltation). Measures of the dominant orientations of the vegetation and petrographical analysis of the aeolian deposits provide us the opportunity to geographically delimit the blownout areas. Thus, with the ratio of (1) the loess deposit volume accumulated in the jökulhlaup channels since 1996 and (2) the blownout land surfaces, a minimum deflation rate for the east part of the Skeiðarársandur is calculated. According to our results, the Skeiðarársandur loses 0.05 to 0.1 mm in thickness due to aeolian transport by saltation each year.

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