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Analysis of wind-blown sand movement over transverse dunes.

Jiang H, Huang N, Zhu Y - Sci Rep (2014)

Bottom Line: Wind-blown sand movement often occurs in a very complicated desert environment where sand dunes and ripples are the basic forms.In fact, the windward slope gradient plays a great role in the lift-off and sand particle saltation.This study is a preliminary study on windblown sand movement in a complex terrain, and is of significance in the control of dust storms and land desertification.

View Article: PubMed Central - PubMed

Affiliation: 1] Key Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University, Lanzhou 730000, China [2] Laboratoire de Mécanique des Fluides et d'Acoustique, Ecole Centrale de Lyon, Ecully 69130, France.

ABSTRACT
Wind-blown sand movement often occurs in a very complicated desert environment where sand dunes and ripples are the basic forms. However, most current studies on the theoretic and numerical models of wind-blown sand movement only consider ideal conditions such as steady wind velocity, flat sand surface, etc. In fact, the windward slope gradient plays a great role in the lift-off and sand particle saltation. In this paper, we propose a numerical model for the coupling effect between wind flow and saltating sand particles to simulate wind-blown sand movement over the slope surface and use the SIMPLE algorithm to calculate wind flow and simulate sands transport by tracking sand particle trajectories. We furthermore compare the result of numerical simulation with wind tunnel experiments. These results prove that sand particles have obvious effect on wind flow, especially that over the leeward slope. This study is a preliminary study on windblown sand movement in a complex terrain, and is of significance in the control of dust storms and land desertification.

No MeSH data available.


Related in: MedlinePlus

Observed and simulated mass flux profiles over transverse dune.
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Related In: Results  -  Collection

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f11: Observed and simulated mass flux profiles over transverse dune.

Mentions: Figure 11 reveals that the mass flux of sand particles gradually decreases with height over the windward slope and increases as they horizontally approach the windward slope top where Hs is 0.1 m. The numerical simulations results show a good agreement with experimental measurement results (Hs is 0.1 m).


Analysis of wind-blown sand movement over transverse dunes.

Jiang H, Huang N, Zhu Y - Sci Rep (2014)

Observed and simulated mass flux profiles over transverse dune.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4248282&req=5

f11: Observed and simulated mass flux profiles over transverse dune.
Mentions: Figure 11 reveals that the mass flux of sand particles gradually decreases with height over the windward slope and increases as they horizontally approach the windward slope top where Hs is 0.1 m. The numerical simulations results show a good agreement with experimental measurement results (Hs is 0.1 m).

Bottom Line: Wind-blown sand movement often occurs in a very complicated desert environment where sand dunes and ripples are the basic forms.In fact, the windward slope gradient plays a great role in the lift-off and sand particle saltation.This study is a preliminary study on windblown sand movement in a complex terrain, and is of significance in the control of dust storms and land desertification.

View Article: PubMed Central - PubMed

Affiliation: 1] Key Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University, Lanzhou 730000, China [2] Laboratoire de Mécanique des Fluides et d'Acoustique, Ecole Centrale de Lyon, Ecully 69130, France.

ABSTRACT
Wind-blown sand movement often occurs in a very complicated desert environment where sand dunes and ripples are the basic forms. However, most current studies on the theoretic and numerical models of wind-blown sand movement only consider ideal conditions such as steady wind velocity, flat sand surface, etc. In fact, the windward slope gradient plays a great role in the lift-off and sand particle saltation. In this paper, we propose a numerical model for the coupling effect between wind flow and saltating sand particles to simulate wind-blown sand movement over the slope surface and use the SIMPLE algorithm to calculate wind flow and simulate sands transport by tracking sand particle trajectories. We furthermore compare the result of numerical simulation with wind tunnel experiments. These results prove that sand particles have obvious effect on wind flow, especially that over the leeward slope. This study is a preliminary study on windblown sand movement in a complex terrain, and is of significance in the control of dust storms and land desertification.

No MeSH data available.


Related in: MedlinePlus