Dune Morphology and Dynamics

Wiggs, Giles F.S.

doi:10.1016/b978-0-12-818234-5.00073-0

Cited by 6 publications

(5 citation statements)

References 156 publications

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“…Active desert dunes were identified as having fully bare sand surfaces, visible crest lines and slip-faces. We used a first-order classification to distinguish between four main desert dune types that are typically recognized 3,46 : Barchan (B), Transverse-crescentic (T), Linear-seif (L), and Star (S) dunes, and we only considered the spatial scale of individual dune bedforms that can respond to the decadal sand drift regime, rather than large scale sand sea structures such as mega-dunes, draas, and transgressive ridges that evolve over centuries. For each dune type present in a grid cell we estimated its areal extent in four classes: localized pockets (<10%), sparse (~30%), partial (~50%), and full (>80%) coverage.…”

Section: Dune Field Inventorymentioning

confidence: 99%

Desert dunes transformed by end-of-century changes in wind climate

Baas

Delobel²

2022

Nat. Clim. Chang.

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Sand dunes in arid regions are significant mobile landforms which require adaptation and mitigation strategies for protecting human infrastructure and economic assets from encroachment, and which play a significant role in desertification and atmospheric dust emissions. Here we show how the shape, migration speed and direction of active desert dunes around the world are projected to change by the end of this century, in response to shifts in sand-moving wind regime associated with climate change under the SSP5-8.5 scenario. We find significant transformations in dune dynamics for many sand seas and dune fields across the Sahara, The Horn of Africa, the Southern Arabian Peninsula, South-Asia, China, and Australiaas well as increased potential of sand sea expansion and re-activation of dormant dune fields -which we can link to alterations in the Hadley circulation, extra-tropical cyclone activity, and monsoon systems resulting from global warming.

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Section: Dune Field Inventorymentioning

confidence: 99%

Desert dunes transformed by end-of-century changes in wind climate

Baas

Delobel²

2022

Nat. Clim. Chang.

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“…These bedforms are typically several centimeters high, exhibit reverse longitudinal asymmetry compared to mature dunes, and can develop rapidly over several hours. Extensive research has explored the physical dynamics and morphology of mature desert sand dunes (Bagnold, 1937(Bagnold, , 1941Lancaster, 1982;Werner, 1990;Andreotti et al, 2002a;Charru et al, 2013;du Pont, 2015;Wiggs, 2021). We also have some evidence of the dynamics by which emerging dunes might grow into early-stage protodunes and more mature dune forms (Kocurek et al, 1992;Elbelrhiti, 2012;Hage et al, 2018;Montreuil et al, 2020), where the subtle coupling of topography, wind flow, and sediment transport acts to reinforce their growth (Baddock et al, 2018;Delorme et al, 2020;Gadal, Narteau, Ewing, et al, 2020;Lü et al, 2021;Bristow et al, 2022).…”

Section: Introductionmentioning

confidence: 81%

Field evidence for the initiation of isolated aeolian sand patches

Delorme,

Nield,

Wiggs

et al. 2023

Preprint

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“…Barchan dunes are formed in areas with unidirectional wind flow, and a limited sand supply [68][69][70]. A barchan dune typically has a crescentic shape, with a shallow angled windward slope (typically 10˚-14˚on Earth [71], and a downwind lee slope which is at the angle of repose [72]. When wind flow is perpendicular to the dune crest, flow separation and recirculation occurs between the two 'horns' of the dune (Fig 4).…”

Section: Worked Examplementioning

confidence: 99%

From Macro- to Microscale: A combined modelling approach for near-surface wind flow on Mars at sub-dune length-scales

Love

Jackson²,

Michaels³

et al. 2022

PLoS ONE

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The processes that initiate and sustain sediment transport which contribute to the modification of aeolian deposits in Mars’ low-density atmosphere are still not fully understood despite recent atmospheric modelling. However, detailed microscale wind flow modelling, using Computational Fluid Dynamics at a resolution of <2 m, provides insights into the near-surface processes that cannot be modeled using larger-scale atmospheric modeling. Such Computational Fluid Dynamics simulations cannot by themselves account for regional-scale atmospheric circulations or flow modifications induced by regional km-scale topography, although realistic fine-scale mesoscale atmospheric modeling can. Using the output parameters from mesoscale simulations to inform the input conditions for the Computational Fluid Dynamics microscale simulations provides a practical approach to simulate near-surface wind flow and its relationship to very small-scale topographic features on Mars, particularly in areas which lack in situ rover data. This paper sets out a series of integrated techniques to enable a multi-scale modelling approach for surface airflow to derive surface airflow dynamics at a (dune) landform scale using High Resolution Imaging Science Experiment derived topographic data. The work therefore provides a more informed and realistic Computational Fluid Dynamics microscale modelling method, which will provide more detailed insight into the surface wind forcing of aeolian transport patterns on martian surfaces such as dunes.

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Dune Morphology and Dynamics

Cited by 6 publications

References 156 publications

Desert dunes transformed by end-of-century changes in wind climate

Desert dunes transformed by end-of-century changes in wind climate

Field evidence for the initiation of isolated aeolian sand patches

From Macro- to Microscale: A combined modelling approach for near-surface wind flow on Mars at sub-dune length-scales

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