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sand transport

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5 - Airflow and Sand Transport on Dunes
from Part III - Dune Processes and Dynamics
Nicholas Lancaster
Book:

Geomorphology of Desert Dunes

Published online:

03 March 2023

Print publication:

23 March 2023, pp 107-121
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Summary

Dunes are created and modified by a series of interactions between the sand surface and the local topographically modified atmospheric boundary layer. Airflow over dunes is characterized by flow acceleration on windward slopes and a complex pattern of flow separation and secondary flows on lee slopes. Spatial and temporal changes in airflow give rise to nonlinear changes in sand transport rates, which in turn determine the initiation, development, and equilibrium morphology of all dunes.