Three-dimensional æolian dynamics within a bowl blowout during offshore winds

Greenwich Dunes, Prince Edward Island, Canada

Patrick A. Hesp, Ian Walker

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

This paper examines the æolian dynamics of a deep bowl blowout within the foredune of the Greenwich Dunes, on the northeastern shore or Prince Edward Island, Canada. Masts of cup anemometers and sonic anemometers were utilized to measure flow velocities and directions during a strong regional ESE (offshore) wind event. The flow across the blowout immediately separated at the upwind rim crest, and within the blowout was strongly reversed. High, negative vertical flows occurred down the downwind (but seaward) vertical scarp which projected into the separation envelope and topographically forced flow back into the blowout. A pronounced, accelerated jet flow existed near the surface across the blowout basin, and the flow exhibited a complex, anti-clockwise structure with the near-surface flow following the contours around the blowout basin and lower slopes. Significant æolian sediment transport occurred across the whole bowl basin and sediment was delivered by saltation and suspension out the blowout to the east. This study demonstrates that strong offshore winds produce pronounced topographically forced flow steering, separation, reversal, and more complex three-dimensional motions within a bowl blowout, and that such winds within a bowl blowout play a notable role in transporting sediment within and beyond deep topographic hollows in the foredune.

Original languageEnglish (US)
Pages (from-to)389-399
Number of pages11
JournalAeolian Research
Volume3
Issue number4
DOIs
StatePublished - Jan 2012
Externally publishedYes

Fingerprint

blowout
dune
anemometer
basin
jet flow
saltation
flow velocity
sediment
sediment transport

Keywords

  • Aerodynamics
  • Bowl blowout
  • Foredune
  • Prince Edward Island
  • Sediment transport
  • Wind flow

ASJC Scopus subject areas

  • Earth-Surface Processes
  • Geology

Cite this

Three-dimensional æolian dynamics within a bowl blowout during offshore winds : Greenwich Dunes, Prince Edward Island, Canada. / Hesp, Patrick A.; Walker, Ian.

In: Aeolian Research, Vol. 3, No. 4, 01.2012, p. 389-399.

Research output: Contribution to journalArticle

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