globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116363
论文题名:
Reversing transverse dunes: Modelling of airflow switching using 3D computational fluid dynamics
作者: Jackson D.W.T.; Cooper A.; Green A.; Beyers M.; Guisado-Pintado E.; Wiles E.; Benallack K.; Balme M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 544
语种: 英语
中文关键词: aeolian ; airflow ; computational fluid dynamics ; reversing dunes ; transverse ridges
英文关键词: Computational fluid dynamics ; Sediment transport ; Shear flow ; Shear stress ; Topography ; Turbulence ; Wind ; Airflow dynamics ; Detached flows ; Flow behaviours ; Surface alteration ; Surface shear stress ; Topographic modifications ; Transverse aeolian ridges ; Wind directions ; Air ; airflow ; computational fluid dynamics ; dune ; eolian process ; Mars ; sediment transport ; topography ; wind direction
英文摘要: 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. © 2020 The Author(s)
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165051
Appears in Collections:气候变化与战略

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作者单位: Centre for Coastal & Marine Research, School of Geography & Environmental Sciences, Ulster UniversityNorthern Ireland, United Kingdom; Geological Sciences, University of KwaZulu-Natal, South Africa; Klimaat Consulting & Innovation Inc., Guelph, Canada; Department of Physical Geography and Regional Geographic Analysis, University of Seville, Seville, Spain; South African National Biodiversity Institute, Somerset Street, Grahamstown, South Africa; School of Physical Sciences, The Open University, Walton Hall, Milton Keynes, United Kingdom

Recommended Citation:
Jackson D.W.T.,Cooper A.,Green A.,et al. Reversing transverse dunes: Modelling of airflow switching using 3D computational fluid dynamics[J]. Earth and Planetary Science Letters,2020-01-01,544
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