"... The Cowlitz Valley connects the prairies south of the Sound
with the Columbia Valley and Oregon. It is a natural corridor,
used continuously and with ever increasing frequency for more
than a century.
The story of the Cowlitz Corridor is primarily one of modes of
travel. It begins with...
A class of inorganic thin-film transistor (TFT) semiconductor materials has emerged involving oxides composed of post-transitional cations with (n-1)d¹⁰ns⁰ (n≥4) electronic configurations. This thesis is devoted to the pursuit of topics involving the development of these materials for TFT applications: Deposition of zinc oxide and zinc tin oxide semiconductor
layers...
Cartographic generalization results In locational Inaccuracies of the
generalized feature. The cartographer expresses the amount of generalization
and the locational inaccuracy of the feature through map design and choice of
map scale. This information is often lost when the map is digitized. In the environment
of geographic Information systems, the...
A growing realization that wetlands are potentially
valuable resources has recently stimulated efforts towards
their protection. While a foundation for wetland management
exists, decision makers still lack adequate tools for addressing
issues of wetland preservation vs. development.
Wetland preservation values are often neglected in traditional
market analyses and in the...
Understory vegetation in artificially created tree canopy gaps in the Pacific
Northwest was studied to determine 1) variation in understory vegetation cover
between gap edges and gap centers, as well as between control and treatment plots,
2) spatial patterns of biomass and difference in biomass patterns among plots, 3)
individual...
The purpose of this paper is to analyze the characters of
winter wave climates of the Washington and Oregon coasts from 1980-
81 through 1989-90 and to compare these spatially and temporally
with the occurrence of storm events. Of particular interest is the
analysis of wave climates and weather events...
Although one of the most common problems facing the forest manager is the determination of management regime, there has been little effort to explicitly recognize the effect of harvesting technology and topography in the analysis. This study introduces a unified theory in harvesting in mountainous terrain which brings together silvicultural...
Four aspects of the ecology of members of the Monotropoideae (achiorophyllous
Ericaceae, referred to here as "monotropes") are presented: (1) a clarified conceptualization
of monotrope nutrition based on a detailed literature review, (2) the relationship of
monotrope populations to the plant communities of Limpy Rock RNA, (3) a test of...
A hypothesis used to explain the relationship between timber harvesting
and landslides is that tree roots add mechanical support to soil, thus increasing
soil strength. Upon harvest, the tree roots decay which reduces soil strength and
increases the risk of management -induced landslides. The technical literature
does not adequately support...
Although buffer strips have long been used as a
protection tool when logging near streams, long-term
studies investigating buffer strip dynamics are rare.
Steinblums et al. (1984) inventoried 40 buffer strips 1 to
15 years old in the western Oregon Cascades beginning in
the summer of 1975. Numerous site and...
The local and remote sources of variability of the South Atlantic Ocean are investigated using a set of numerical experiments and satellite data. A global, eddy-permitting, numerical simulation is analyzed to investigate the dynamical links between the Antarctic Circumpolar Current (ACC) and the Malvinas Current (MC). The model results indicate...
Plantation forests on mountainous areas in Tanzania, East Africa, were successfully
established in the 1950's. Harvesting started in the 1970's to meet increased national
timber demand. Current problems of unharvested areas and potential environmental
degradation are associated with uncontrolled harvests, mismatch of harvest systems to
site needs, and post-harvest practices....
The change in emphasis from tractor and highlead logging systems to the advanced logging systems of skyline, balloon, and helicopter has stirred researchers to study the operations of the advanced systems. The extra work involved in preparing an area for contract timber removal using advanced logging systems, however, has not...
Characteristics of low flows of nine streams in eastern Oregon were explored using long-term streamflow records. Year-to-year dependence of low flows is highly significant for streams in the Blue Mountain and the southeastern Oregon regions. Low streamflows increased over the period of record for seven of the selected streams. Flow...
The environmental justice framework has been applied to many environmentally negative issues in the past such as toxic storage and disposal facilities, toxic release inventory sites, air quality, transportation, and global climate change. It has not yet been applied to energy production in a quantitative study. This study investigates the...
This study evaluated the effect of soil compaction on the growth
of natural regeneration on volcanic ash-influenced soils in the
southern Washington Cascades. Growth of 9 to 18 year-old sapling-.
sized Ponderosa pine (Pinus ponderosa Laws.) was studied on sites
ranging from 915 to 1006 m elevation in an area...
Steady flow fields and flow-induced wall stresses have been evaluated by experimental measurements and computational fluid dynamics (CFD) analysis in a series of patient-specific abdominal aortic aneurysm (AAA) models, over a range of Reynolds numbers (Re) from 125 to 3000 (500 to 3000 for CFD). Experimental methods used particle image...
The purpose of this study was to examine certain hydrologic
properties of the soil and subsoil on a steep forested slope and relate
these -rceTties to the movement of water via subsurface routes.
The hydrologic properties examined were bulk density, soil texture,
total porosity, pore size distribution, saturated hydraulic conductivity,...
Field studies indicate that accumulation of finely divided organic
debris in the channels of mountain streams after clearcutting may be
responsible for subsequent reduction in the dissolved oxygen concentration.
The purpose of this study was to quantify the biochemical
oxygen demand (BOD) of Douglas-fir needles and twigs, western
hemlock needles...
Meyer's Canyon, a tributary of Bridge Creek in the John Day
Basin, is a deeply incised valley fill in northcentral Oregon. The
current channel is incised to the Cretaceous and Tertiary bedrock.
To determine the precedence of the current incision and the variation
and timing of depositional sequences, the sediments...