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Form-flow interactions of an aeolian saucer blowout

Auteur(s) et Affiliation(s)

HUGENHOLTZ, C.H.
Dep. of Geography, Univ., Lethbridge, Canada
WOLFE, S.A.
Natural Resources Canada, Geological Survey of Canada, Ottawa, Canada


Description :
Airflow patterns through a saucer blowout are examined from wind speed and direction measurements made during a chinook wind event. Overall, a two-fold process is identified, where south-westerly flows have greater potential for eroding the deflation basin, while westerly flows have greater potential for evacuating sand from within the blowout. Visual observations indicate that sand eroded from the deflation basin during south-westerly flows is re-distributed to adjacent zones of low wind speed until axis-parallel winds evacuate the sand through the opening in the east rim. Morphometric changes since 1994 indicate that the blowout morphology has remained relatively constant, suggesting a persistent interplay between oblique and axis-parallel wind erosion events. Collectively, these findings indicate that the angle of approach winds is an important control on saucer blowout morphodynamics.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2009, vol. 34, n°. 7, p. 919-928, nombre de pages : 10, Références bibliographiques : 1 p.

Date :
2009

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais
Droits :
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