Reversing transverse dunes: Modelling of airflow switching using 3D computational fluid dynamics
•3D modelling shows shear stress clustering on transverse dunes with reversed winds.•Winds on long stoss slopes and steep lees have higher surface shear stress and flux.•Reversed winds result in almost 10% less aeolian flux.•Dune surface remoulds to smoother topography under reversed wind regimes.•F...
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| Published in: | Earth and planetary science letters Vol. 544; p. 116363 |
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| Main Authors: | , , , , , , , |
| Format: | Journal Article |
| Language: | English |
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Elsevier B.V
15.08.2020
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| ISSN: | 0012-821X, 1385-013X |
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| Abstract | •3D modelling shows shear stress clustering on transverse dunes with reversed winds.•Winds on long stoss slopes and steep lees have higher surface shear stress and flux.•Reversed winds result in almost 10% less aeolian flux.•Dune surface remoulds to smoother topography under reversed wind regimes.•Findings may be an useful analogue for Transverse Aeolian Ripples (TARs) on Mars.
Airflow dynamics across dune surfaces are the primary agent of sediment transport and resulting dune migration movements. Using 3D computational fluid dynamic modelling, this study examined the behaviour of near surface airflow travelling over transverse (reversing) dunes on a beach system. Wind direction was modelled in two opposing directions (both perpendicular to dune crestline) to investigate surface alteration of flow on the dune topography. Surface shear stress, velocity streamlines and potential sediment flux were extracted from the modelling. The work shows that under SW winds the surface (under the configuration measured) underwent almost 10% more aeolian flux than with opposing NE winds of the same magnitude. Differences were also noted in the airflow behaviour with SW winds staying attached to the surface with less turbulence while NE winds had detached flow at dune crests with more localised turbulence. The work provides detailed insights into how 3D airflow behaviour is modified according to incident flow direction of reversing dune ridges and the resulting implications for their topographic modification. These dune types also provide interesting analogues for similarly scaled Transverse Aeolian Ridges found on Mars and the findings here provide important understanding of flow behaviour of such landforms and their potential movement. |
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| AbstractList | •3D modelling shows shear stress clustering on transverse dunes with reversed winds.•Winds on long stoss slopes and steep lees have higher surface shear stress and flux.•Reversed winds result in almost 10% less aeolian flux.•Dune surface remoulds to smoother topography under reversed wind regimes.•Findings may be an useful analogue for Transverse Aeolian Ripples (TARs) on Mars.
Airflow dynamics across dune surfaces are the primary agent of sediment transport and resulting dune migration movements. Using 3D computational fluid dynamic modelling, this study examined the behaviour of near surface airflow travelling over transverse (reversing) dunes on a beach system. Wind direction was modelled in two opposing directions (both perpendicular to dune crestline) to investigate surface alteration of flow on the dune topography. Surface shear stress, velocity streamlines and potential sediment flux were extracted from the modelling. The work shows that under SW winds the surface (under the configuration measured) underwent almost 10% more aeolian flux than with opposing NE winds of the same magnitude. Differences were also noted in the airflow behaviour with SW winds staying attached to the surface with less turbulence while NE winds had detached flow at dune crests with more localised turbulence. The work provides detailed insights into how 3D airflow behaviour is modified according to incident flow direction of reversing dune ridges and the resulting implications for their topographic modification. These dune types also provide interesting analogues for similarly scaled Transverse Aeolian Ridges found on Mars and the findings here provide important understanding of flow behaviour of such landforms and their potential movement. |
| ArticleNumber | 116363 |
| Author | Guisado-Pintado, Emilia Jackson, Derek W.T. Green, Andrew Beyers, Meiring Balme, Matt Wiles, Errol Cooper, Andrew Benallack, Keegan |
| Author_xml | – sequence: 1 givenname: Derek W.T. orcidid: 0000-0003-1778-2187 surname: Jackson fullname: Jackson, Derek W.T. email: d.jackson@ulster.ac.uk organization: Centre for Coastal & Marine Research, School of Geography & Environmental Sciences, Ulster University, Northern Ireland, United Kingdom – sequence: 2 givenname: Andrew surname: Cooper fullname: Cooper, Andrew organization: Centre for Coastal & Marine Research, School of Geography & Environmental Sciences, Ulster University, Northern Ireland, United Kingdom – sequence: 3 givenname: Andrew orcidid: 0000-0001-9438-1315 surname: Green fullname: Green, Andrew organization: Geological Sciences, University of KwaZulu-Natal, South Africa – sequence: 4 givenname: Meiring surname: Beyers fullname: Beyers, Meiring organization: Klimaat Consulting & Innovation Inc., Guelph, Canada – sequence: 5 givenname: Emilia orcidid: 0000-0003-1115-4059 surname: Guisado-Pintado fullname: Guisado-Pintado, Emilia organization: Centre for Coastal & Marine Research, School of Geography & Environmental Sciences, Ulster University, Northern Ireland, United Kingdom – sequence: 6 givenname: Errol surname: Wiles fullname: Wiles, Errol organization: South African Institute for Aquatic Biodiversity, Somerset Street, Grahamstown, South Africa – sequence: 7 givenname: Keegan surname: Benallack fullname: Benallack, Keegan organization: Geological Sciences, University of KwaZulu-Natal, South Africa – sequence: 8 givenname: Matt orcidid: 0000-0001-5871-7475 surname: Balme fullname: Balme, Matt organization: School of Physical Sciences, The Open University, Walton Hall, Milton Keynes, United Kingdom |
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| Keywords | aeolian reversing dunes computational fluid dynamics transverse ridges airflow |
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