Storm‐dominated bottom boundary layer dynamics on the Northern California Continental Shelf: Measurements and predictions

Journal of Geophysical Research C: Oceans
By: , and 

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Abstract

Measurements of near‐bottom velocity profiles in 85 m water depth during a storm on the continental shelf off northern California using the GEOPROBE tripod in December 1979 provided estimates of shear velocities, , and roughness lengths, , when the near‐bottom velocity profiles were logarithmic. These estimates agree within 90% confidence intervals with values computed from a simple near‐bottom combined wave‐current model that includes movable bed effects. The reasonably good comparison between model and profile estimates of suggests that such models can be used to predict bed shear stresses (or shear velocities) under combined flows of waves and currents typical of stormy conditions on continental shelves if stratification corrections to the velocity profile resulting from suspended sediment are small. The repeated occurrences of storms of similar intensities and wind velocities during the winter months off northern California suggest that the resultant high bottom stresses due to the combined effects of waves and currents are major factors in controlling the distribution of surficial sediment on the central portion of the northern California shelf.

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Publication type Article
Publication Subtype Journal Article
Title Storm‐dominated bottom boundary layer dynamics on the Northern California Continental Shelf: Measurements and predictions
Series title Journal of Geophysical Research C: Oceans
DOI 10.1029/JC092iC02p01817
Volume 92
Issue C2
Contributing office(s) Pacific Coastal and Marine Science Center
Description 11 p.
First page 1817
Last page 1827
Country United States
State California
Other Geospatial Northern California Continental Shelf
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