Simulations of spatial variability in particle-size emissions during wind erosion events

Auteur(s) et Affiliation(s)

BUTLER, H.J.

Australian Centre for Sustainable Catchments and Fac. of Engineering and Surveying, Univ. of Southern Queensland, Toowoomba, Australie

MCTAINSH, G.H.

Atmospheric Environment Research Centre, The Griffith School of Environment, Griffith Univ., Queensland, Brisbane, Australie

HOGARTH, W.L.

Fac. of Science and Information Technology, Univ., New South Wales, Newcastle, Australie

Description :
This study simulates how spatial variations in particle-size emissions from a playa affect bulk and size-resolved dust concentration profiles during 2 contrasting wind erosion events (a small local and a large regional event) in the Channel Country, Lake Eyre Basin, Australia. The regional event had higher dust concentration as a result of stronger frontal winds and higher erodibility across the playa. For each event, 2 emission scenarios are simulated to determine if measured size-resolved dust concentration profiles can be explained by spatial variability in source area emissions. The first scenario assumes that particle-size emissions from source areas occur at a uniform rate, while the second scenario assumes that particle-size emissions vary between and within source areas. The results suggest that the contribution of each particle-size to the total emitted dusts is not related to wind speed and turbulence.

Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2012, vol. 37, n°. 13, p. 1362-1375, nombre de pages : 14, Références bibliographiques : 1 p.

Date :
2012

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

Langue :
Anglais