气候变化领域集成服务门户(CCPortal): Reversing transverse dunes: Modelling of airflow switching using 3D computational fluid dynamics

CCPortal

DOI	10.1016/j.epsl.2020.116363
	Reversing transverse dunes: Modelling of airflow switching using 3D computational fluid dynamics
	Jackson D.W.T.; Cooper A.; Green A.; Beyers M.; Guisado-Pintado E.; Wiles E.; Benallack K.; Balme M.
发表日期	2020
ISSN	0012821X
卷号	544
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)
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202673
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
推荐引用方式 GB/T 7714	Jackson D.W.T.,Cooper A.,Green A.,et al. Reversing transverse dunes: Modelling of airflow switching using 3D computational fluid dynamics[J],2020,544.
APA	Jackson D.W.T..,Cooper A..,Green A..,Beyers M..,Guisado-Pintado E..,...&Balme M..(2020).Reversing transverse dunes: Modelling of airflow switching using 3D computational fluid dynamics.Earth and Planetary Science Letters,544.
MLA	Jackson D.W.T.,et al."Reversing transverse dunes: Modelling of airflow switching using 3D computational fluid dynamics".Earth and Planetary Science Letters 544(2020).