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Sediment sources and clay mineral distributions off the Oregon coast : evidence for a poleward slope undercurrentKarlin, Robert 03 August 1978 (has links)
Graduation date: 1979
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Steric contributions to the seasonal oscillation in sea level off OregonBrunson, Burlie A. 25 July 1972 (has links)
Hydrographic, tidal, and meteorological data collected near
Newport, Oregon, were analyzed to determine the relative contributions
of temperature, salinity, and air pressure variations to the
recorded departures of sea level from mean sea level.
Nearshore the steric and recorded sea levels exhibited a
similar seasonal oscillation, with high sea levels in winter and low
sea levels in summer.
Analysis of the steric topography indicated the presence of two
distinct regions off Oregon, one extending from shore to 45 nm, and
the other from 65 nm offshore to seaward of NH 165. The seasonal
oscillations of sea level were approximately six months out of phase
in the two regions.
The nearshore region was greatly influenced by upwelling and
local runoff, while the offshore region was dominated by the Columbia
River plume which flows south during the summer months.
Redacted for privacy
Steric departures were of greater magnitude than air pressure
departures, but no single dominant cause of sea level oscillation
could be identified, thus justifying the labeling of this region as a
transition zone from steric to pressure dominance in sea level
determination.
Thermal and haline components of the steric departure were
shown to be of comparable magnitude and in phase. The range of
steric departures was approximately 16 cm, a figure compatible with
ranges reported for stations of similar latitude. / Graduation date: 1973
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Changes in chemical distributions and relationships during an upwelling event off the Oregon coastAtlas, Elliot Leonard 19 January 1973 (has links)
Graduation date: 1973
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Beach profile changes and onshore-offshore sand transport on the Oregon coastAguilar Tunon, Nicolas A. 09 May 1977 (has links)
Two beaches with significant differences in grain size and thus in
beach profile morphology and response to wave conditions were studied on
the Oregon coast. Gleneden Beach, just south of Siletz Spit and Lincoln
City, has a median grain size of 0.36 mm (medium sand) and a steep beach
face slope, while Devil's Punchbowl Beach has a median grain size of
0.23 mm (fine sand) and low concave-up beach face slope.
Eleven beach profile surveys were obtained at Gleneden Beach and
twelve at Devil's Punchbowl Beach between August 1976 and April 1977; on
average once every two weeks during spring tides. Gleneden Beach showed
the typical change from a swell profile with a wide berm that prevails
during summer months to a storm profile with little or no berm that
exists during the stormy winter months. This transition occurred in
August and September, being completed by early November. The finer-grained
Devil's Punchbowl Beach also showed general erosion during the
fall. However, a transition from a swell profile to a storm profile is
not as clear there as the beach has little berm, even in mid-summer, and
always has a concave-up appearance typical of the winter storm profile.
Gleneden Beach and Devil's Punchbowl Beach did not always agree in
their responses to the changing wave conditions. One may be eroding at
the same time the other is accreting. These differences in response to
changing wave conditions appear to result from their differences in
grain size.
Volume changes of the erosion or deposition at the two beaches
were computed from successive beach profiles. The coarser-grained
Gleneden Beach showed larger changes in erosion and deposition, the
maximum erosion being 0.71 m³ per meter of profile length, while the
finer-grained Devil's Punchbowl Beach showed a maximum erosion of 0.25 m³
per meter of profile length. Attempts were made at relating the erosion
or deposition and the volumes of erosion/deposition to the wave breaker
heights and deep-water wave steepness that occurred between the beach
profile sequences. There is only a vague relationship between the volumes
of beach erosion/deposition and the wave heights, the probability
of erosion increasing and the volume of sand eroded increasing with increasing
wave breaker heights. The maximum wave heights that occur
during the time interval appear to be most important to the volume of
erosion, erosion volumes being large if storm breaker heights reach 5
to 6 meters or greater. Deposition prevails when the average breaker
heights fall below 4 meters and storms are limited to breaker heights
less than 5 meters. The deep-water wave steepness shows little relationship
to the erosion or deposition volumes, indicating that the wave
period is not as important a parameter as the wave height to beach erosion. / Graduation date: 1977
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Observations of the coastal upwelling region off Oregon during 1972Huyer, Adriana, 1945- 15 November 1973 (has links)
Observations of wind, currents, sea level and hydrography
obtained during the 1972 Coastal Upwelling Experiment (CUE-I) are
described. Only phenomena with periods longer than a day are considered.
One section describes the changes observed during a period
of variable winds in early July 1972. Another describes a ribbon of
relatively cool water observed early in the upwelling season and
attributes its existence to advection of Subarctic water by the coastal
jet associated with upwelling. A third section describes the seasonal
development of the upwelling regime between April and October 1972.
These studies are combined with other studies of CUE-I data to provide
a partial description of the upwelling regime which is compared
to the conceptual model developed prior to CUE-I.
It is concluded that the vertical and onshore velocity fields are
as yet largely unknown. The alongshore velocity field includes
southward surface flow with a coastal jet, a persistent vertical shear
with deeper velocities northward relative to the surface and high
coherence with the wind and sea level at periods of several days. A
poleward undercurrent is observed, but it may not be an integral part
of the upwelling regime.
The hydrography has a strong seasonal cycle. Differences
between any two sections between April and October l972 are smaller
than between any of these and a section occupied in January 1973.
Oscillations in the wind with periods of several days cause significant
changes in the region inshore of 10 km and in the upper 20 m further
offshore. Subsurface temperature observations are not coherent with
the wind at periods of several days. / Graduation date: 1974
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An investigation of upwelling along the Oregon coastSmith, Robert Lloyd 13 May 1964 (has links)
The oceanic phenomenon of upwelling along the Oregon coast is
examined. Upwelling in both the open ocean and coastal regions is
discussed. An idealized model is used, envisaging the ocean off
Oregon to consist of homogeneous surface and deep layers separated
by a pycnocline. The equations of motion are solved to yield the vertical
velocity at the base of the surface layer. A comparison is made
between the model and results inferred from hydrographic data.
In the open ocean region qualitative agreement is observed between
the wind stress curl and the depth of the surface layer. Geostrophic
meridional transports relative to the 1000 decibar surface
were computed and found to be of the order of the uncertainty. In the
coastal upwelling region surface layer zonal transports were computed
from the meridional component of the mean wind stress and
compared with values inferred from oceanographic data. Coastal upwelling
along the Oregon coast is clearly associated with the northerly
(longshore) component of the wind stress. / Graduation date: 1964
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Subsurface currents off the Oregon coastStevenson, Merritt R. 11 March 1966 (has links)
Graduation date: 1966
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The statistics and kinematics of transverse sand bars on an open coastKonicki, Kathryn Maria 15 January 1999 (has links)
Graduation date: 1999 / Best scan available for figures. Original has a moray pattern.
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Continental shelf sediments in the vicinity of Newport, OregonBushnell, David Clifford 05 August 1963 (has links)
Graduation date: 1964
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Structure and kinematics of the permanent oceanic front off the Oregon coastCollins, Curtis Allan 07 April 1964 (has links)
Using the hydrographic data collected by the ACONA from June
1961 to May 1963, the Oregon coastal front has been examined. Representative
sigma-t surfaces were chosen to delineate the front, and
changes in position of these surfaces with time were used to obtain
zonal flow rates for the frontal and surface layers.
From May to early October upwelling resulted in offshore flow.
Onshore flow was indicated from late October to January, and indeterminate
zonal flow occurred during the remainder of the year. Flow
within the front agreed with these surface flows in ten of the fourteen
observational periods. / Graduation date: 1964
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