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...
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...
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...
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...
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...
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...
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 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...