Hart Mountain is a basaltic fault block mountain
in the semi-desert region of the northern Basin and Range
province in south-central Oregon. Geomorphic processes
associated with lingering snowpatches have formed nivation
hollows, which are small scale depressions in the hillsides.
The lingering snow in the hollows prohibits shrub
growth. Bedrock...
A log step develops when large woody debris extends across the active
channel, creating a change in the water surface elevation as the stream
spills over the log step. By forming a series of vertical falls, log
steps reduce the amount of potential energy available for conversion to
kinetic energy...
A hierarchical approach to the assessment of wind power site potential
at Prairie Peak, Oregon, is evaluated. Maps, aerial photographs,
and terrestrial photographs are utilized. Data are derived from photographs
of wind flagged trees with the aid of an interactive computer
program. The technique produces a map of isotachs, lines...
Cirque aspects and elevations in the major highlands of Oregon indicate a pattern of climate during the Pleistocene similar to that of today. Mean cirque floor elevation increases toward the drier interior. Concentrations of cirques facing northeast, and steep gradients of cirque floor trend surfaces to the southwest, indicate a...
The semantic differential technique was used to
quantify four interest groups' perceptions of twenty-six
Alaskan scenes. The scenes represented both panoramic views
and views of Mount McKinley from different sites in southcentral
Alaska. The perceptions were measured on six semantic
scales ("ugly-beautiful", "dislike-like", "unpleasantpleasant",
"unstimulating-stimulating", "level-mountainous",
and 'monotonous-varied"), and the...
Pleistocene glaciation in the upper elevations of the
Western Cascade Mountains took two characteristic forms: cirque and
valley glaciers. Field observations in the Neal Creek and Thomas
Creek drainage areas of Snow Peak provide evidence of three glacial
advances. Glacial landforms in the Neal Creek Valley are dominated
by a...
Geographical geomorphology is a young science with a long,
complex history closely paralleling the growth and development of
geology. From an enthusiastic beginning under the tutelage of
William Morris Davis, geographical geomorphology rapidly lost its
influence and stature in geography. Today there is a sense of
purpose and direction that...
This research paper focuses upon subsurface flow because of
its dominant influence on the other types of hilislope water flow
processes. The basic theory of water movement is quickly discussed in
order to build the reader's general background knowledge. With this
background, the journey starts into the poorly understood realm...
Sand dunes are used as indicators of wind
power potential and examples are presented of their application
as a prospecting technique at four study sites in
the Central Columbia River Basin. Aerial reconnaissance
is combined with interpretation of photography and topographic
maps as a basis of sand dune analysis. Sand...
Map delineations of soil and vegetation for a 14,000
acre (5,800 hectare) site in the Oregon Coast Range were
compared. Research objectives were to ascertain the
types of information that could be extracted from delineation
comparisons and to develop a methodology suited
to this purpose. The latter objective was achieved...
Human activity has led to the reactivation of
portions of a Pleistocene landslide complex in The Dalles,
Oregon. Slope movements are in rocks of the Chenowith
formation: agglomerate, conglomerate, tuff breccia, sandstone,
and siltstone. Slope movements occur in at least
two distinct areas in The Dalles. At one, the shear...
The Lawrence Memorial Grassland Preserve, located in
Wasco County, Oregon, exhibits a wide variety of soil mounds and
patterned ground features. The size, shape, and distribution of
several elements of this peculiar landscape were analyzed with a
detailed map, field observations, and statistical procedures.
Common soil mound shapes are circular,...
This report describes the latest in a series of studies sponsored by the Nationwide Forestry Applications Program. Each such study has attempted to enhance the interpretability of remotely-sensed imagery. In this case the image type of specific interest is high-altitude color infrared (CIR) photography. This is a resource management tool...
The focus of this study was to examine and record
the physical changes brought about by the breaching of the
Siltcoos Foredune. The origin of the dunes and the physical
processes that operate there must be considered before
effects due to the breach can be studied. A series of field...
The 18 May 1980 eruption of Mount St. Helens, emplaced between 3-3.5 billion cubic yards (bcy) of poorly sorted material ranging from silt to boulders, extending from river mile (RM) 25 to RM 38 in the upper North Fork Toutle River drainage. Sediment yields from the debris avalanche were calculated...
The Jackson/Frazier Wetland is a small wetland
in Benton County, Oregon. It has one main inf lowing
stream, Jackson/Frazier Creek, and one main
outfiowing stream, a man-made drainage ditch.
Streamflow measurements were collected for both
streams over a four month period of November 1983 to
February 1984. This data was...
The purpose of this study is to review the historical development of the central ideas of
military geography and terrain analysis and to examine these new research initiatives from that
perspective. Although the mobility and technological aspects of warfare have changed rapidly,
the essential geographic nature of warfare has remained...
Soils of Santa Cruz Island, California were mapped
at the subgroup taxonomic level using a Geographic Information
System (GIS) and field survey. Lithologic substrate,
vegetative cover, slope gradient and slope aspect comprised
the GIS data layers; these correspond to the soil-forming
factors that were hypothesized to exert the greatest influence...
A slide inventory was conducted for a small watershed
in the northern Oregon Coast Range. Data on geology,
topography and climate were used to evaluate land stability
in the Moss Creek basin. As expected, a strong correlation
with slope steepness was shown. In addition, failures
predominantly occurred on slopes with...
A photographic band-ratioing technique was investigated.
The data source consisted of 70 mm Landsat Multispectral Scanner
(MSS) negatives. The process would require combining registered
positive and negative transparencies to achieve a ratio
modulation in the resulting print. This would also require
compensation for atmospheric effects on the original negatives by...
The purpose of this study is to determine if the
ntoraines damming proglacial Carver Lake are ice-cored.
The methodology to be employed consists of interpretation
of aerial photographs and field observations. The results
of these studies will be compared. to past research of
known ice-cored moraines in other regions of...
The Cape Verde Islands, off the coast of West Africa, are subject to violent precipitation events that cause extensive soil erosion and degradation of the landscape. A systematic approach to the collection, analysis, and dissemination of hydrophysical and geographic data was needed to effectively analyze the cause and effect variables...
The purpose of this paper is to define terrain analysis, as it relates to
military applications; to review the historical development of the central ideas
of terrain analysis, which has led to the development of three computer
programs that are designed to make terrain analysis an automated process
rather than...
This project explored one set of tools and procedures that
appeared to have the potential to make the handling of the spatial
data necessary for resource management more efficient and
effective. This project used data from the Nature Conservancy's
Lawrence Memorial Grassland Preserve and was designed to explore
a low...
Landslide processes occurring on a hillslope in McDonald-Dunn
Forest on the eastern slope of the Oregon Coastal Range are
described in terms of type, magnitude. minimum age and site
characteristics. Debris flows and debris avalanches are the
dominant types of slope movement occurring in the study area.
Landslide events classified...