effects of slope and slope position on local and upstream fluid threshold friction velocities

In deserts, dunes are common aeolian landforms, and parallel ridges are common in cultivated land. A computational fluid dynamics (CFD) model is used to simulate a stable wind blowing over slope beds of varying height and coupled with the slope-compensating fluid threshold friction velocity formula....

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Bibliographic Details
Published in:Earth surface processes and landforms 2008-10, Vol.33 (12), p.1814-1823
Main Authors: Huang, Ning, Shi, Feng, Van Pelt, R. Scott
Format: Article
Language:English
Subjects:
Arid and mediterranean areas
Bgi / Prodig
eolian deposits
equations
flow acceleration
fluid mechanics
friction velocity
Geomorphology
landscape position
local fluid threshold friction velocity
particle position
particles
Physical geography
simulation models
slope
upstream fluid threshold friction velocity
velocity
wind erosion
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Summary:In deserts, dunes are common aeolian landforms, and parallel ridges are common in cultivated land. A computational fluid dynamics (CFD) model is used to simulate a stable wind blowing over slope beds of varying height and coupled with the slope-compensating fluid threshold friction velocity formula. The model accurately reproduced patterns of flow deceleration at the slope toe and stoss flow acceleration. Based on the CFD-based model, quantitative analyses of slope gradient and particle position on the initiation of particle movement are performed. Results indicate that the slope has a great influence on particle saltation in the windward slope, and the initiation of particle movement is particularly sensitive to particle position with respect to the slope.
ISSN:1096-9837
0197-9337
1096-9837
DOI:10.1002/esp.1735