Observations of River Plume Mixing in the Surf Zone

S. E. KASTNER; A. R. HORNER-DEVINE; J. M. THOMSONS. N. GIDDINGS

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Observations of River Plume Mixing in the Surf Zone

机译：Observations of River Plume Mixing in the Surf Zone

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We use salinity observations from drifters and moorings at the Quinault River mouth to investigate mixing and stratification in a surf-zone-trapped river plume. We quantify mixing based on the rate of change of salinity DS/Dt in the drifters' quasi-Lagrangian reference frame. We estimate a constant value of the vertical eddy diffusivity of salt of K_z = (2.2 ± 0.6) × 10~(-3) m~2 s~(-1), based on the relationship between vertically integrated DSIDt and stratification, with values as high as 1 × 10~(-2) m~2 s~(-1) when stratification is low. Mixing, quantified as DSIDt, is directly correlated to surf-zone stratification, and is therefore modulated by changes in stratification caused by tidal variability in freshwater volume flux. High DSIDt is observed when the near-surface stratification is high and salinity gradients are collocated with wave-breaking turbulence. We observe a transition from low stratification and low DSIDt at low tidal stage to high stratification and high DSIDt at high tidal stage. Observed wave-breaking turbulence does not change significantly with stratification, tidal stage, or offshore wave height; as a result, we observe no relationship between plume mixing and offshore wave height for the range of conditions sampled. Thus, plume mixing in the surf zone is altered by changes in stratification; these are due to tidal variability in freshwater flux from the river and not wave conditions, presumably because depth-limited wave breaking causes sufficient turbulence for mixing to occur during all observed conditions.

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《Journal of physical oceanography》 |2023年第3期|959-977|共19页
作者
S. E. KASTNER; A. R. HORNER-DEVINE; J. M. THOMSONS. N. GIDDINGS;
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作者单位

Department of Environmental Science, Western Washington University, Bellingham, Washington;

Department of Civil and Environmental Engineering, University of Washington, Seattle, Washington;

Applied Physics Laboratory, University of Washington, Seattle, WashingtonScripps Institution of Oceanography, University of California, San Diego, LaJolla, California;

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正文语种英语
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Estuaries; Rivers; Coastal flows; Mixing; Wave breaking;

Observations of River Plume Mixing in the Surf Zone

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