The temporal and spatial variability of crescentic sandbars is analyzed with hourly
long-term (months) video observations collected at four barred sites and are qualitatively
compared to the temporal and spatial variability predicted by hypotheses underpinning
existing approaches and models for crescentic bar formation (edge-wave template model,
linear stability analysis, and...
The relationships among stand structure, Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) branch characteristics, and red alder (Alnus rubra (Bong.)) stem form attributes were explored for 10- to 15-year-old trees growing in mixed Douglas-fir – red alder plantations. Treatments included a range of species proportions, and red alder was either planted simultaneously...
Molds are an increasingly important issue for all building materials, including
wood. While washing with bleach is a commonly recommended method for removing
molds, and the associated discolorations, there is surprisingly little information on the
effectiveness of this treatment. The ability of mold removal treatments to brighten
wood and eliminate...
Two imputation techniques for predicting natural regeneration in complex stands prevalent in southeastern British Columbia (BC) were compared using data from the Interior Cedar-Hemlock moist warm subzone variant 2 (ICHmw2) in the vicinity of Nelson, BC. Imputation approaches offer advantages over other modeling approaches in that they provide estimates of...
Because of highly dissipative conditions and strong alongshore gradients in foreshore
beach morphology, wave run-up data collected along the central Oregon coast during
February 1996 stand in contrast to run-up data currently available in the literature. During
a single data run lasting approximately 90 min, the significant vertical run-up elevation...
With fire suppression, many western forests are expected to have fewer gaps
and higher stem density of shade-tolerant species as light competition becomes a more
significant influence on stand pattern and composition. We compared species composition,
structure, spatial pattern, and environmental factors such as light and soil moisture between
two...
Mean fields, seasonal cycles, and interannual variability are examined for fields of
satellite-derived chlorophyll pigment concentrations (CHL), sea surface height (SSH), and
sea surface temperature (SST) during 1997–2002. The analyses help to identify three
dynamic regions: an upwelling zone next to the coast, the Ensenada Front in the north,
and...
We simulated the erosion and accretion of a natural beach using a wave-resolving
eddy-diffusive model of water and suspended sediment motion in the bottom boundary
layer. Nonlinear advection was included in this one-dimensional (vertical profile) model
by assuming that waves propagated almost without change of form. Flows were forced by...
Hop is a dioecious perennial with female plants grown commercially
for brewing purposes. Parent selection in hop breeding on the basis of
heterotic potential has not been reported in literature even though dominance
has been reported in hops for several economically important traits.
The objectives of this study were to...
The first reliable aircraft measurements of characteristic cloud drop charges were obtained by utilizing a counterflow virtual impactor to substantially increase charge sensitivity and eliminate spurious contact charging that contaminated previous aircraft measurements. We find average drop charges more than an order of magnitude larger than expected from mountain surface...
Improved interpretations of the strength of the San
Andreas Fault near Parkfield, CA based on thermal data
require quantification of processes causing significant
scatter and uncertainty in existing heat flow data. These
effects include topographic refraction, heat advection by
topographically-driven groundwater flow, and uncertainty
in thermal conductivity. Here, we re-evaluate...
This article analyzes the barotropic circulation in the Southwestern Atlantic Shelf using
a three-dimensional numerical model forced with winds and tides. South of 40°S, the shelf
circulation is dominated by the propagation of the semidiurnal tides. In this region the
diurnal tides are generally weak, except at the shelf edge...
In 2002, a group of Qiang in China's Sichuan Province performed an ancient ritual combining the sacred and the secular. This ritual remains an integral part of the Qiang people's religious and social lives.
In October 2000, the Matarranya River suffered an extraordinary flood with a measured flow rate of approximately 450 m³/s in
the town of Vall-de-roures and a return period of about 500 years, according to the Ebro Hydrographic Confederation. The
objective of this study was to determine the influence of the...
Climate warming may first show up in forests as increased growth, which occurs as warmer temperatures, increased carbon dioxide, and more precipitation encourage higher rates of photosynthesis. The second way that climate change may show up in forests is through changes in disturbance regimes—the long-term patterns of fire, drought, insects,...
A multispectral optical sensor collects data at select wavebands or channels. An example is the Sea-viewing Wide-Field-of-view Sensor (SeaWiFS) ocean color satellite, which measures eight wavebands between 402 and 885 nm (20-40 nm bandwidth with peaks centered around 412, 443, 490, 510, 555, 670, 765, and 865 nm). Optical oceanographers...
In the U.S., chickpeas commonly are used fresh in salads or in soup. Chickpeas are rich in protein, complex carbohydrates, and fiber, while
low in fat and cholesterol. Chickpea is a potential rotational crop and fits well in wheat and barley cropping systems. It is an option for cereal
farmers...
Forage production is of primary importance to Oregon’s livestock enterprises and agricultural economy. The forage is either grazed or conserved.
Conserved forage is needed to feed livestock in times of little forage growth—a key cost of livestock production. Extending the grazing season reduces the cost and time involved in feeding...
Ongoing discussion between the Oregon State University libraries' instruction program and the English composition program focuses on improving collaboration between our programs and more effectively integrating the research process into the English composition curriculum. The authors, formerly the library instruction coordinator and the Assistant Composition Coordinator, briefly describe a qualitative...
The levels of copper, chromium, and arsenic in soil surrounding CCA-treated posts and beneath CCA-treated stakes were investigated at a plot near Gainesville, Florida. Metal levels were elevated in soil immediately adjacent to the treated wood, but decreased with distance away or depth. Mean extractable arsenic levels ranged from 1.74...
Scientists are trying to find out how to best utilize high-tech devices in the field. Jennie Cornell seeks to find out how to best utilize helicopters for Precision Forestry
In order to understand the economics of the 2001 irrigation curtailment in the Upper Klamath Basin, and the prospects for lower-cost solutions
to future irrigation shortfalls, one must appreciate just how much the economic value of irrigation water varies from one piece of land to
another throughout the Upper Basin....
Mushrooms are found lots of places, such as beneath trees or on woody debris. Dr. Nancy Weber however found mushrooms in a spot most people wouldn't expect to look, in the canopy.
As part of the GLOBEC NEP collaborative research project on the California Current (CC),
this was the second of two cruises in 2002 to study the physical and biological oceanographic
distributions and processes that influence juvenile salmonid habitat along the Oregon and northern
California coast. The 2002 cruises followed similar...
This project, part of the Northeast Pacific GLOBEC Long Term Observation Project (NEPGLOBEC-
LTOP), constitutes the first multi-year study of phytoplankton variability in the Oregon coastal
environment. The work divides into two studies: analysis of interseasonal change and analysis of detailed
changes within the summer upwelling period. In the first...
A three-dimensional large-eddy simulation (LES) model was used to examine how stratified flow interacts with bottom obstacles in the coastal ocean. Bottom terrain representing a 2D ridge was modeled using a finite-volume approach with ridge height (4.5 m) and width (~30 m) and water depth (~45 m) appropriate for coastal...
Connections, sometimes tenuous, have previously been noted between stratospheric
Kelvin waves and several stratospheric trace constituents. The present study finds
evidence of Kelvin wave signatures in ozone from the Microwave Limb Sounder (MLS)
and Cryogenic Limb Array Etalon Spectrometer (CLAES) instruments aboard the Upper
Atmosphere Research Satellite. Predominant variations near...
Until recently, studies of the fate of primary production in coastal upwelling systems have focused mainly on export through sinking of particulate organic matter (POM). In week-long deck incubations conducted during the upwelling season off Oregon, a large accumulation of carbonrich (C:N ≥ 16) dissolved organic matter (DOM) occurred following...
We have measured the CO₂ concentration of air occluded during the last 40,000 years in the deep Siple Dome A (hereafter Siple Dome) ice core, Antarctica. The general trend of CO₂ concentration from Siple Dome ice follows the temperature inferred from the isotopic composition of the ice and is mostly...
Estimates of mass transfer timescales from 316 solute transport experiments reported in 35 publications are compared to the pore-water velocities and residence times, as well as the experimental durations. New tracer experiments were also conducted in columns of different lengths so that the velocity and the advective residence time could...
The objective of this study was to compare two techniques for estimating benthic fluxes of nutrients (nitrate, phosphate, and silicic acid) and Ge/Si flux ratios. In situ flux chambers were deployed, and cores were collected and incubated at 9 sites along the California margin in July 2001. Both techniques were...
Despite the importance of the spring phytoplankton bloom off Oregon as a food source for zooplankton, little is known about the sources of phytoplankton seed stock for the bloom or its timing. Experiments were conducted in the late winter to determine if the benthic boundary layer (BBL) could be a...
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 analytical model of the dispersion relation is used to derive quantitative expressions...
The Transboundary Freshwater Dispute Database provides a framework for quantitative, global-scale explorations of the relationship between freshwater resources and international cooperation and conflict. Projects were designed to test common theories linking freshwater resources to cooperation and conflict, in particular within the context of geography and environmental security. The projects, which...
At Oregon State University (OSU), the School of Electrical Engineering and Computer Science (EECS) and the OSU Libraries are working together on a project to improve the effectiveness and accessibility of digital information created and collected by academic libraries. This project focuses on making digital resources more accessible through an...
Atmospheric methane (CH₄) recorded in Antarctic ice cores represents the closest ice proxy available for Greenland temperature changes beyond times when Greenland climate records are available. The record over four climatic cycles from the Vostok ice core offers the opportunity to study the phase relationship between Greenland and Antarctic climate...
High pressure processing was investigated for controlling Cheddar cheese ripening. One-month- or 4-month-old Cheddar cheeses were subjected to pressures ranging from 200 to 800 MPa for 5 min at 25 °C. The number of viable Lactococcus lactis (starter) and Lactobacillus (nonstarter) cells decreased as pressure increased. Subsequent storage of the...
This study examined daily streamflow response over up to four decades in northwest conifer forest and eastern deciduous forest sites in the United States. We used novel methods to analyze daily observations of climate and streamflow spanning more than 900 basin years of record at 14 treated/control basin pairs where...
A moderate high-pressure processing (HPP) treatment
is proposed to accelerate the shredability of Cheddar
cheese. High pressure processing (345 and 483 MPa
for 3 and 7 min) applied to unripened (1 d old) stirredcurd
Cheddar cheese yielded microstructure changes
that differed with pressure level and processing time.
Untreated and pressure-treated...
Bransfield Basin is an actively extending marginal basin separating the inactive South Shetland arc from the northern Antarctic Peninsula. Rift-related volcanism is widespread throughout the central Bransfield Basin, but the wider eastern Bransfield Basin was previously unsampled. Lavas recovered from the eastern subbasin form three distinct groups: (1) Bransfield Group...
The correlation between dimensionless shear ϕₘ and dimensionless height z/L, where L is the Obukhov length, for stable conditions is strongly influenced by self‐correlation for the present datasets. This effect is quite large for stronger stability but still significant for near‐neutral conditions. A conditional analysis of nocturnal stable boundary‐layer data,...