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  Salt Polygons and Porous Media Convection

Lasser, J., Nield, J. M., Ernst, M., Karius, V., Wiggs, G. F., Threadgold, M. R., et al. (2023). Salt Polygons and Porous Media Convection. Physical Review X, 13: 011025. doi:10.1103/PhysRevX.13.011025.

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PhysRevX.13.011025.pdf (Publisher version), 6MB
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 Creators:
Lasser, Jana1, Author           
Nield, Joanna M., Author
Ernst, Marcel1, Author           
Karius, Volker, Author
Wiggs, Giles F. S., Author
Threadgold, Matthew R., Author
Beaume, Cédric, Author
Goehring, Lucas, Author
Affiliations:
1Group Pattern formation in the geosciences, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063304              

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 Abstract: From fairy circles to patterned ground and columnar joints, natural patterns spontaneously appear in many complex geophysical settings. Here, we investigate the origins of polygonally patterned crusts of salt playa and salt pans. These beautifully regular features, approximately a meter in diameter, are found worldwide and are fundamentally important to the transport of salt and dust in arid regions. We show that they are consistent with the surface expression of buoyancy-driven convection in the porous soil beneath a salt crust. By combining quantitative results from direct field observations, analog experiments, and numerical simulations, we further determine the conditions under which salt polygons should form, as well as how their characteristic size emerges.

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Language(s): eng - English
 Dates: 2023-02-242023
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevX.13.011025
 Degree: -

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Project name : We thank Grace Holder (Great Basin Unified Air Pollution Control District) for support at Owens Lake, the U.S. National Park Service for access to Death Valley (Permit No. DEVA-2016-SCI-0034), and Antoine Fourrière and Birte Thiede for their work on preliminary experiments on convection. TLS processing used the Iridis Southampton Computing Facility. The 3D numerical simulations were carried out on ARC4, part of the High Performance Computing facilities at the University of Leeds, United Kingdom. M. R. T. was supported by the Leeds-York-Hull Natural Environment Research Council Doctoral Training Partnership Panorama under Grant No. NE/S007458/1. Sua Pan work was funded by Natural Environment Research Council (Grant No. NE/H021841/1), World University Network, and Southampton Strategic Interdisciplinary Research Development Funds, and enabled by Botswana Ministry of Environment, Wildlife, and Tourism (Permit No. EWT 8/36/4 XIV) and Botswana Ash (Pty) Ltd.
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Title: Physical Review X
  Abbreviation : Phys. Rev. X
Source Genre: Journal
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Publ. Info: New York, NY : American Physical Society
Pages: 24 Volume / Issue: 13 Sequence Number: 011025 Start / End Page: - Identifier: Other: 2160-3308
CoNE: https://pure.mpg.de/cone/journals/resource/2160-3308