Jet flow over foredunes

Hesp, P.A. and Smyth, T.A.G. (2016) Jet flow over foredunes. Earth Surface Processes and Landforms, 41 (12). pp. 1727-1735. ISSN 1096-9837

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Jet flows, which are localized flows exhibiting a high speed maxima, are relatively common in nature, and in many devices. They have only been occasionally observed on dunes, and their dynamics are poorly known. This paper examines computational fluid dynamic (CFD) two-dimensional (2D) modelling of jet flow over a foredune topography. Flow was simulated in 10° increments
from onshore (0°) to highly oblique alongshore (70°) incident wind approach angles. CFD modelling reveals that the formation of a jet is not dependent on a critical wind speed, and an increase in incident wind velocity does not affect the magnitude of jet flow. A jet is first formed at ~1.0m seawards of the foredune crest on the Prince Edward Island foredune morphology example examined here. A jet is not developed when the incident wind is from an oblique approach angle greater than ~50° because there is significantly less flow acceleration across a much lower slope at this incident angle. The presence of a scarp does influence the structure of the crest jet, in that the jet is more pronounced where a scarp is present. Surface roughness affects the magnitude of jet expansion and jets are better developed on bare surfaces compared to vegetated ones.

Item Type: Article
Additional Information and Comments: This is the peer reviewed version of the following article: Hesp, P. A., and Smyth, T. A. G. (2016) Jet flow over foredunes. Earth Surf. Process. Landforms, doi: 10.1002/esp.3945., which has been published in final form at 10.1002/esp.3945. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving."
Faculty / Department: Faculty of Science > Geography and Environmental Science
Depositing User: Thomas Smyth
Date Deposited: 28 Sep 2016 15:50
Last Modified: 28 Jan 2018 17:08

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