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Avalanche dynamics on desert dunes: Processes and drivers, from ancient to modern


Project Description

Project Rationale:
Avalanching is responsible for wind-blown dune migration on Earth and Mars and because avalanches are preserved in dune stratigraphy, they are the most direct way that we can interpret past wind-climate conditions. From the stratigraphic record in ancient and modern dunes, we can observe variability in avalanche deposit thickness, slope and grainsize distribution. Recent evidence from a 5 m barchan suggested avalanche magnitude is driven by grainfall dynamics which link to wind speed [1] and observations of avalanches have been made on a Martian barchan visited by Curiosity [2]. However, evidence is lacking on the extent this theory holds for dunes of different heights and grain size. Without a better grasp of the process-form feedbacks between dune size and avalanche drivers, it is impossible to interpret the ancient wind climates that formed dune environments now preserved in the rock record. Previous attempts to investigate avalanche dynamics have been hampered because slopes are unstable for mounting instruments. This PhD will use the latest technology to measure avalanches remotely and supplement field experiments with laboratory replicates. Ultimately the research outcomes will provide unique, cutting-edge insight into the influence of avalanche dynamics on aeolian dune migration, both modern and ancient.

Funding Notes

You can apply for fully-funded studentships (stipend and fees) from INSPIRE if you:
Are a UK or EU national.
Have no restrictions on how long you can stay in the UK.
Have been 'ordinarily resident' in the UK for 3 years prior to the start of the project.

Please click View Website for more information on eligibilty and how to apply

References

Nield, J.M., Wiggs, G,F.S., Baddock, M.C., Hipondoka, M.H.T. (2017) Coupling leeside grainfall to avalanche characteristics in aeolian dune dynamics, Geology, 45(3): 271-274, doi: 10.1130/G38800.1.

Ewing, R.C., Lapotre, M.G.A., Lewis, K.W., Day, M., Stein, N., Rubin, D.M. (2017) Sedimentary processes of the Bagnold Dunes: Implications for the eolian rock record of Mars, Journal of Geophysical Research: Planets 122 (12), 2544-2573.

Baddock, M.C., Wiggs, G.F.S., Livingstone, I. (2011) A field study of mean and turbulent flow characteristics upwind, over and downwind of barchan dunes, Earth Surface Processes and Landforms 36 (11), 1435-1448

How good is research at University of Southampton in Geography, Environmental Studies and Archaeology?
Geography

FTE Category A staff submitted: 32.00

Research output data provided by the Research Excellence Framework (REF)

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