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ScholarsArchive at Oregon State University
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When a stably stratified density interface is embedded in a region of strong velocity
shear, hydrodynamic instabilities result. Here we generalize the stratified shear layer
to allow an offset between the centre of the shear layer and the density...
2007 (iso8601)
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Direct numerical simulations of turbulence resulting from Kelvin–Helmholtz instability in stably
stratified shear flow are used to study sources of anisotropy in various spectral ranges. The set of
simulations includes various values of the...
2000-06 (iso8601)
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Turbulence resulting from Kelvin–Helmholtz instability in layers of localized stratification and
shear is studied by means of direct numerical simulation. Our objective is to present a
comprehensive description of the turbulence evolution in terms...
2000-06 (iso8601)
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Direct numerical simulations of turbulence resulting from Kelvin{Helmholtz instability
in stratified shear flow are used to examine the geometry of the dissipation
range in a variety of flow regimes. As the buoyancy and shear Reynolds numbers...
1999 (iso8601)
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The growth of secondary vortices on the braids separating Kelvin–Helmholtz billows
is investigated via numerical simulations. The similarity theory of Corcos & Sherman
(1976) is extended to include mixing processes with Prandtl number greater than...
2003 (iso8601)
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A sequence of direct simulations is used to study mechanisms for the growth of secondary
circulations and turbulence in stratified shear flows. Five cases are examined, of which four deliver
Holmboe waves as the primary instability and the fifth...
2006 (iso8601)
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The envelope function for Kelvin–Helmholtz billows growing from a point disturbance is derived on the basis of linear perturbation theory. The result describes an elliptical patch of billows that expands linearly in time as the billows grow. An...
2004 (iso8601)
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The role of stratified shear instability in maintaining the deep cycle of
turbulence immediately below the equatorial mixed layer is examined by means of
linear stability analysis. The Taylor-Goldstein equation is solved numerically, using...
1998-05-15 (iso8601)
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Establishment of marine protected areas (MPAs) has been documented to effectively manage marine resource's diversity and enhance fisheries productivity. However, there must be a critical consideration of how these sites are selected and the actual...
2010-10-11T20:18:05Z (iso8601)
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PN-specific, absolute, and Chl a-specific nitrate uptake rates were measured during two upwelling seasons and one winter off Oregon. Although PN-specific and absolute uptake rates showed no dependence on nitrate concentration, Michaelis-Menten...
1995 (iso8601)
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On Oregon coastal rocky shores, filter-feeders were relatively abundant and macrophytes were relatively scarce
at Strawberry Hill, whereas opposite abundance patterns occurred at Boiler Bay. To determine whether nearshore
oceanographic differences...
1994 (iso8601)
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Three staining methods were used to identify metabolically active bacteria in Lake Kinneret,
northern Israel: CTC, DAPI staining followed by a propanol wash, and the Molecular Probes
Live/Dead stain. Positive results from these methods purport to...
2001-02-28 (iso8601)
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Previous work has demonstrated selective feeding by bacterivorous protists on the basis
of prey size. Other prey characteristics may also affect protist grazing rates. In this study, we investigated
relative uptake rates of fluorescently labeled...
1993-12-30 (iso8601)
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We propose quantification of the activity of digestive enzymes as a novel way to estimate
rates of protist grazing in natural waters. Our first application of this approach was determination of
protistan bacterivory by assaying the activity of...
1993-10-05 (iso8601)
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Grazing by phagotrophic flagellates and ciliates is a major source of mortality for bacterioplankton in both
marine and freshwater systems. Recent studies have demonstrated a positive relationship between clearance
rate and prey size for...
1992-08 (iso8601)
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We evaluated the extent to which the average metabolic activity of open ocean bacterioplankton
changed during 2 to 3 d incubations of 1 μm filtered seawater at in situ temperature. Indices
of bacterial activity during incubation experiments were...
1999-12-30 (iso8601)
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A variety of macromolecules labeled with FITC (fluorescein isothiocyanate), including
carbohydrates (dextran) and proteins (ferritin, casein, albumin, concavalin A), spanning a range of
molecular weights from 55 to 2000 kD, were actively ingested...
1993-02-09 (iso8601)
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Current meter moorings maintained over the Oregon continental shelf in 1973 and 1975 clearly show
the difference between winter and spring oceanographic regimes and the rapid transition between the regimes.
In winter the mean alongshore current is...
1979-11-20 (iso8601)
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Repeated conductivity, temperature, and depth (CTD) sections were made across the continental
margin off Peru at 5°S and 10°S between November 1981 and May 1984, i.e., before, during, and after El
Nino of 1982-1983. Coastal sea level at Paita...
1987-12-15 (iso8601)
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In summer 1988, we made repeated mesoscale surveys of a grid extending 200 km offshore between
37°N and 39°N in the coastal transition zone off northern California, obtaining continuous acoustic
Doppler current profiler data and...
1991-08-15 (iso8601)
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We investigated sea level fluctuations at seven locations from San Francisco to Torino, British
Columbia, during a 2-year period beginning in August 1973. Using overlapping 2-month periods, we
found the alongshore correlation to vary with time and...
1978-04-20 (iso8601)
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Three upward looking acoustic Doppler current profilers (ADCP) were deployed beneath meteorological buoys
in the Gulf of Tehuantepec, Mexico, during winter 1988-1989. Hourly averaged wind speed data from the buoys
and from ship when in the...
1992-11-15 (iso8601)
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