S. Davarpanah Jazi
Influence of Coriolis force upon bottom boundary layers in a large‐scale gravity current experiment: Implications for evolution of sinuous deep‐water channel systems
Davarpanah Jazi, S.; Wells, M.G.; Peakall, J.; Dorrell, R.M.; Thomas, R.E.; Keevil, G.M.; Darby, S.E.; Sommeria, J.; Viboud, S.; Valran, T.
Dr Robert Dorrell R.Dorrell@hull.ac.uk
University Research Fellow
Dr Robert Thomas R.E.Thomas@hull.ac.uk
Senior Research Fellow in Geomorphology and Flood Risk
Oceanic density currents in many deep-water channels are strongly influenced by the Coriolis force. The dynamics of the bottom-boundary layer in large geostrophic flows, and low Rossby number turbidity currents, are very important for determining the erosion and deposition of sediment in channelized contourite currents and many large-scale turbidity currents. However, these bottom boundary layers are notoriously difficult to resolve with oceanic field measurements, or in previous small-scale rotating laboratory experiments. We present results from a large, 13 m diameter, rotating laboratory platform that is able to achieve both stratified and highly turbulent flows in regimes where the rotation is sufficiently rapid that the Coriolis force can potentially dominate. By resolving the dynamics of the turbulent bottom boundary in straight and sinuous channel sections, we find that the Coriolis force can overcome centrifugal force to switch the direction of near-bed flows in channel bends. This occurs for positive Rossby numbers less than +0.8, defined as RoR =
|Journal Article Type||Article|
|Journal||Journal of Geophysical Research: Oceans|
|Publisher||American Geophysical Union|
|Peer Reviewed||Peer Reviewed|
|APA6 Citation||Davarpanah Jazi, S., Wells, M., Peakall, J., Dorrell, R., Thomas, R., Keevil, G., …Valran, T. (in press). Influence of Coriolis force upon bottom boundary layers in a large‐scale gravity current experiment: Implications for evolution of sinuous deep‐water channel systems. Journal of geophysical research. C, Oceans, https://doi.org/10.1029/2019jc015284|
|Keywords||Gravity currents; Coriolis force; Centrifugal force; Sinuous submarine channels; Ekman boundary layers; Laboratory experiments|
|Additional Information||Received: 2019-05-13; Accepted: 2020-02-01; Published: 2020-02-10|
This file is under embargo due to copyright reasons.
Contact R.E.Thomas@hull.ac.uk to request a copy for personal use.
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