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Title: Coupling leeside grainfall to avalanche characteristics in aeolian dune dynamics
Authors: Nield, Joanna M.
Wiggs, Giles F.S.
Baddock, Matthew C.
Hipondoka, Martin H.T.
Issue Date: 2017
Publisher: © The Authors. Published by the Geological Society of America
Citation: NIELD, J.M. ...et al., 2017. Coupling leeside grainfall to avalanche characteristics in aeolian dune dynamics. Geology, 45(3), pp. 271-274.
Abstract: Avalanche (grainflow) processes are fundamental drivers of dune morphodynamics and are typically initiated by grainfall accumulations. In sedimentary systems, however, the dynamism between grainfall and grainflow remains unspecified because simple measurements are hampered by the inherent instability of lee slopes. Here, for the first time, terrestrial laser scanning is used to quantify key aspects of the grainfall process on the lee (slip face) of a barchan sand dune. We determine grainfall zone extent and flux and show their variability under differing wind speeds. The increase in the downwind distance from the brink of peak grainfall under stronger winds provides a mechanism that explains the competence of large avalanches to descend the entire lee slope. These findings highlight important interactions between wind speed, grainfall, and subsequent grainflow that influence dune migration rates and are important for correct interpretation of dune stratigraphy.
Description: This is an Open Access Article. It is published by Geological Society of America under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/
Sponsor: This study was funded by National Geographic Society Science and Exploration Europe (GEFNE110-14), British Society for Geomorphology and NERC GEF )1025) grants.
Version: Published version
DOI: 10.1130/G38800.1
URI: https://dspace.lboro.ac.uk/2134/23600
Publisher Link: http://dx.doi.org/10.1130/G38800.1
ISSN: 0091-7613
Appears in Collections:Published Articles (Geography and Environment)

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