Jet flow over foredunes

Patrick Hesp, Thomas Smyth

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

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 ~1.0 m 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.
LanguageEnglish
Pages1727-1735
Number of pages9
JournalEarth Surface Processes and Landforms
Volume41
Early online date27 Mar 2016
DOIs
Publication statusPublished - 30 Sep 2016
Externally publishedYes

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jet flow
incident
computational fluid dynamics
wind velocity
two-dimensional modeling
geography
surface roughness
dune
topography
modeling

Cite this

Hesp, Patrick ; Smyth, Thomas. / Jet flow over foredunes. In: Earth Surface Processes and Landforms. 2016 ; Vol. 41. pp. 1727-1735.
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Jet flow over foredunes. / Hesp, Patrick; Smyth, Thomas.

In: Earth Surface Processes and Landforms, Vol. 41, 30.09.2016, p. 1727-1735.

Research output: Contribution to journalArticle

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