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,...