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Observation and analysis of shear instability in the Fraser River estuary

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Title: Observation and analysis of shear instability in the Fraser River estuary
Author: Tedford, E. W.; Carpenter, J. R.; Pawlowicz, Rich; Pieters, R.; Lawrence, Gregory A.
Issue Date: 2009-11
Publicly Available in cIRcle 2011-05-31
Publisher American Geophysical Union
Citation: Tedford, E.W.; Carpenter, J.R.; Pawlowicz, Rich; Pieters, R.; Lawrence, G.A. 2009. Observation and analysis of shear instability in the Fraser River estuary. Journal of Geophysical Research Oceans 114(11) C11006
Abstract: We investigate the occurrence of shear instability in the Fraser River estuary. Instabilities observed with an echo sounder are compared with a linear stability analysis based on observed velocity and density profiles. We find that each set of observed instabilities coincides with an unstable mode predicted by the Taylor-Goldstein equation. Each of these instabilities occurs in a region where the gradient Richardson number is less than the critical value of 1/4. Both the Taylor-Goldstein predictions and the echo soundings indicate the instabilities are concentrated either above or below the density interface. This “one sidedness” is in contrast to the archetypal Kelvin-Helmholtz instability. Although the dominant source of mixing in the estuary appears to be caused by shear instability, when the tide produces strong near-bed velocities, small-scale overturning due to boundary layer turbulence is apparent throughout the depth. An edited version of this paper was published by AGU. Copyright 2009 American Geophysical Union.
Affiliation: Earth and Ocean Sciences, Dept. of (EOS), Dept of
URI: http://hdl.handle.net/2429/34984
Peer Review Status: Reviewed
Scholarly Level: Faculty

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