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research article

Cohesion-Induced Enhancement of Aeolian Saltation

Comola, F.  
•
Gaume, J.  
•
Kok, J. F.
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May 28, 2019
Geophysical Research Letters

The wind-driven saltation of granular material plays a key role in various geophysical processes on Earth, Mars, Venus, and Titan. Although interparticle cohesion is known to limit the number of grains lifted from the surface through aerodynamic entrainment and granular splash, the role of cohesion in the development of saltation from onset to steady state is still poorly understood. Using a numerical model based on the discrete element method, we show that saltation over cohesive beds sustains itself at wind speeds 1 order of magnitude smaller than those necessary to initiate it, giving rise to hysteresis in which the occurrence of transport depends on the history of the wind. Our results further suggest that saltation over cohesive beds requires much longer distances to saturate, thereby increasing the size of the smallest stable bed forms. These findings have implications for dune formation, dust emission, and snow sublimation over cohesive beds.

  • Details
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Type
research article
DOI
10.1029/2019GL082195
Web of Science ID

WOS:000471237500062

Author(s)
Comola, F.  
Gaume, J.  
Kok, J. F.
Lehning, M.  
Date Issued

2019-05-28

Publisher

AMER GEOPHYSICAL UNION

Published in
Geophysical Research Letters
Volume

46

Issue

10

Start page

5566

End page

5574

Subjects

Geosciences, Multidisciplinary

•

Geology

•

turbulent-flow

•

snow

•

sand

•

grain

•

collisions

•

bed

•

model

•

simulations

•

entrainment

•

initiation

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CRYOS  
SLAB  
Available on Infoscience
June 28, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/158619
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