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...
Chameleon is a physics-based landscape modeling software system designed for modeling and simulations applications. Hyperspectral laboratory, field, and imaging spectrometer measurements are collected as empirical foundation data. Linear spectral unmixing is performed to decompose each image pixel into spectral endmembers. Mathematical manipulation of these fractional abundances and introduction of new...
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...
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...
The ocean wave conditions at the mouth of the Columbia River have
long proven a hazard to ship navigation. Over 62 major shipwrecks
have occurred at, or in the vicinity of the river entrance. The wave
pattern is extremely complex, varying seasonally with prevailing winds
and river discharge, as well...
The John Day Reservoir, a large reservoir between the John Day and the McNary Dams on the Columbia River, must be lowered several feet below design level during salmon migration season in order to preserve anadromous fish habitat. This research assessed the north shore of the John Day Reservoir for...
Field data collection techniques in combination with remote
sensing techniques were used to interpret and map the complex flow pattern of
the numerous glaciers comprising the Juneau lcefield, spanning the Alaska-
Canada boundary range. The extensive nature of the icefield mandated the use
of a variety of methods for surveying...
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...
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...
Gathering empirical data on the factors and processes affecting bedload transport
in the field is difficult. This project conducted during the winter of 1996 field tested a new
passive method of positively tracking individual particle movement. The project was
conducted in Oak Creek, a gravel bedded stream, located in Corvallis,...
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...
Lincoln City, Oregon is an area of active environmental
processes and increasing development. To reduce conflict, a larger
data base on environmental hazards was required. Previous studies
in the area, remote sensing techniques and. field research were used
to accomplish this end. Within Lincoln City, numerous environmental
hazards were identified...
The main purpose of this research is
1. To analyze the terrain/climate of Cape Verde, with emphasis on cloud
cover, and its effect upon satellite image acquisition.
2. To use a methodology that allows the use of AutoCAD to map these clouds effect in image acquisition to permit viewing whatever...
Spectral profiles, transformed divergence values, and feature space derived from Landsat Thematic Mapper (TM) data were used to analyze the ability of four false color composites to discriminate between different classes of salt-affected soils. To compare the spatial distribution of salt-affected soil classes, maps were generated for each false color...
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...
The use of Geographic Information Systems (GIS) is rapidly expanding in almost every field of inquiry. The field of Archaeology is also learning to use GIS to improve both initial data collection in the field and data analysis in the lab. This paper evaluates the usefulness of the GIS software...
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...
In order for proper land use planning
to occur in coastal Lincoln County, Oregon, coastal
erosion rates should be determined. This has been
accomplished by identifying the location of the
Lincoln County coast in 1939, 1959, and 1973 and
measuring the amount of change occurring between
the years. The area...
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...
Much of the rich forestlands of Oregon are subject to frequent mass wasting
events, resulting in severe environmental and economic damages. Extensive research has
shown that this landslide hazard is often exacerbated by many management activities.
Following a severe storm event which triggered thousands of landslides, the Oregon
Department of...