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dc.contributor.authorGregg, M. C.  Concept link
dc.contributor.authorPratt, Lawrence J.  Concept link
dc.date.accessioned2010-10-21T15:59:31Z
dc.date.available2010-11-01T08:21:58Z
dc.date.issued2010-05
dc.identifier.citationJournal of Physical Oceanography 40 (2010): 1087-1105en_US
dc.identifier.urihttps://hdl.handle.net/1912/3974
dc.descriptionAuthor Posting. © American Meteorological Society, 2010. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 40 (2010): 1087-1105, doi:10.1175/2010JPO4312.1.en_US
dc.description.abstractHood Canal, a long fjord in Washington State, has strong tides but limited deep-water renewal landward of a complex constriction. Tide-resolving hydrographic and velocity observations at the constriction, with a depth-cycling towed body, varied markedly during three consecutive years, partly because of stratification variations. To determine whether hydraulic control is generally important and to interpret observations of lee waves, blocking, and other features, hydraulic criticality is estimated over full tidal cycles for channel wide internal wave modes 1, 2, and 3, at five cross-channel sections, using mode speeds from the extended Taylor–Goldstein equation. These modes were strongly supercritical during most of ebb and flood on the gentle seaward sill face and for part of flood at the base of the steep landward side. Examining local criticality along the thalweg found repeated changes between mode 1 being critical and supercritical approaching the sill crest during flood, unsurprising given local minima and maxima in the cross-sectional area, with the sill crest near a maximum. Density crossing the sill sometimes resembled an overflow with an internal hydraulic control at the sill, followed by a hydraulic jump or lee wave. Long-wave speeds, however, suggest cross waves, particularly along the shallower gentler side, where flow downstream of a large-amplitude wave was uniformly supercritical. Supercritical approaching the sill, peak ebb was critical to mode 1 and supercritical to modes 2 and 3 at the base while forming a sluggish dome of dense water over the sill. Full interpretation exceeds observations and existing theory.en_US
dc.description.sponsorshipWashington State Sea Grant funded collection of these observations and the Office of Naval Research their publication. Pratt’s efforts were supported by the National Science Foundation under Grant OCE-0525729.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Meteorological Societyen_US
dc.relation.urihttps://doi.org/10.1175/2010JPO4312.1
dc.subjectChannel flowsen_US
dc.subjectField experimentsen_US
dc.subjectShip observationsen_US
dc.subjectTidesen_US
dc.titleFlow and hydraulics near the sill of Hood Canal, a strongly sheared, continuously stratified fjorden_US
dc.typeArticleen_US
dc.identifier.doi10.1175/2010JPO4312.1


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