Field evidence for the initiation of isolated aeolian sand patches
Field evidence for the initiation of isolated aeolian sand patches
Sand patches are one of the precursors to early-stage protodunes and occur widely in both desert and coastal aeolian environments. Here we show field evidence of a mechanism to explain the initiation of sand patches on non-erodible surfaces, such as desert gravels and moist beaches. Changes in sand transport dynamics, directly associated with the height of the saltation layer and variable transport law, observed at the boundary between non-erodible and erodible surfaces lead to sand deposition on the erodible surface. This explains how sand patches can form on surfaces with limited sand availability where linear stability of dune theory does not apply. This new mechanism is supported by field observations that evidence both the change in transport rate over different surfaces and in-situ patch formation that leads to modification of transport dynamics at the surface boundary.
Delorme, Pauline
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Nield, Joanna
173be2c5-b953-481a-abc4-c095e5e4b790
Wiggs, Giles F. S.
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Baddock, Matthew C.
55f062fc-50a1-4c2d-83ff-a8cc92562346
Bristow, Nathaniel R.
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Best, J.L.
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Christensen, Kenneth T.
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Claudin, Philippe
bc540459-6b06-4c62-a8ea-2b05b760b3ad
28 February 2023
Delorme, Pauline
d7e1a2d1-82e0-4c82-ae92-75d8ada3e51e
Nield, Joanna
173be2c5-b953-481a-abc4-c095e5e4b790
Wiggs, Giles F. S.
0b574ec8-fcd5-43b8-8b0b-0c84a01499d4
Baddock, Matthew C.
55f062fc-50a1-4c2d-83ff-a8cc92562346
Bristow, Nathaniel R.
e7c1a332-aa22-4fe3-aa8a-a9bdfa57e053
Best, J.L.
36ba040c-3d2e-4393-963e-f575ba5afad0
Christensen, Kenneth T.
ecb835fc-a51a-4062-afbf-52dbb0f42ef0
Claudin, Philippe
bc540459-6b06-4c62-a8ea-2b05b760b3ad
Delorme, Pauline, Nield, Joanna, Wiggs, Giles F. S., Baddock, Matthew C., Bristow, Nathaniel R., Best, J.L., Christensen, Kenneth T. and Claudin, Philippe
(2023)
Field evidence for the initiation of isolated aeolian sand patches.
Geophysical Research Letters, 50 (4), [e2022GL101553].
(doi:10.1029/2022GL101553).
Abstract
Sand patches are one of the precursors to early-stage protodunes and occur widely in both desert and coastal aeolian environments. Here we show field evidence of a mechanism to explain the initiation of sand patches on non-erodible surfaces, such as desert gravels and moist beaches. Changes in sand transport dynamics, directly associated with the height of the saltation layer and variable transport law, observed at the boundary between non-erodible and erodible surfaces lead to sand deposition on the erodible surface. This explains how sand patches can form on surfaces with limited sand availability where linear stability of dune theory does not apply. This new mechanism is supported by field observations that evidence both the change in transport rate over different surfaces and in-situ patch formation that leads to modification of transport dynamics at the surface boundary.
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GRL_accepted
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Geophysical Research Letters - 2023 - Delorme - Field Evidence for the Initiation of Isolated Aeolian Sand Patches
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Accepted/In Press date: 30 December 2022
e-pub ahead of print date: 9 January 2023
Published date: 28 February 2023
Additional Information:
Funding Information:
This work was funded by the TOAD (The Origin of Aeolian Dunes) project (funded by the Natural Environment Research Council, UK and National Science Foundation, USA; NE/R010196NSFGEO‐NERC, NSF‐GEO‐1829541, and NSF‐GEO‐1829513). Research was undertaken at GSD under a Scientific Research and Collection permit GRSA‐2018‐SCI‐004, and we are very grateful for support from A. Valdez and F. Bunch. For the Huab fieldwork, we acknowledge Gobabeb Namib Research Institute, J. Kazeurua, I. Matheus, L. Uahengo, MET and NCRST (permits 1913/2014; 2051/2015; 2168/2016, RPIV00022018). Data processing used the IRIDIS Southampton Computing Facility. J. M. Nield was supported by a Department of Geology and Geophysics, Texas AM University, Michel T Halbouty Visiting Chair during the GSD field campaign. We thank B. Andreotti, C. Gadal, C. Narteau and TOAD project partners for useful discussions. We also thank Patrick Hesp and an anonymous reviewer for their careful reading of our manuscript and their insightful comments and suggestions.
Funding Information:
This work was funded by the TOAD (The Origin of Aeolian Dunes) project (funded by the Natural Environment Research Council, UK and National Science Foundation, USA; NE/R010196NSFGEO-NERC, NSF-GEO-1829541, and NSF-GEO-1829513). Research was undertaken at GSD under a Scientific Research and Collection permit GRSA-2018-SCI-004, and we are very grateful for support from A. Valdez and F. Bunch. For the Huab fieldwork, we acknowledge Gobabeb Namib Research Institute, J. Kazeurua, I. Matheus, L. Uahengo, MET and NCRST (permits 1913/2014; 2051/2015; 2168/2016, RPIV00022018). Data processing used the IRIDIS Southampton Computing Facility. J. M. Nield was supported by a Department of Geology and Geophysics, Texas AM University, Michel T Halbouty Visiting Chair during the GSD field campaign. We thank B. Andreotti, C. Gadal, C. Narteau and TOAD project partners for useful discussions. We also thank Patrick Hesp and an anonymous reviewer for their careful reading of our manuscript and their insightful comments and suggestions.
Publisher Copyright:
© 2023. The Authors.
Identifiers
Local EPrints ID: 474136
URI: http://eprints.soton.ac.uk/id/eprint/474136
ISSN: 1944-8007
PURE UUID: d3c44170-64be-4c73-87c6-5f8e43e4ea1b
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Date deposited: 14 Feb 2023 17:37
Last modified: 17 Mar 2024 03:12
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Contributors
Author:
Giles F. S. Wiggs
Author:
Matthew C. Baddock
Author:
Nathaniel R. Bristow
Author:
J.L. Best
Author:
Kenneth T. Christensen
Author:
Philippe Claudin
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