Approximately 5,500 years ago a discreet period of
wetter and cooler environmental conditions prevailed
across the southern Columbia Plateau. This period was
marked by the first prominent episodes of erosion to occur
along the lower Snake River following the height of the
Altithermal and eruption of Mt. Mazama during the...
The El Niño/Southern Oscillation (ENSO) affects millions of people via global teleconnections in the form of drought and torrential rainfall that impact agriculture and food production in many countries. Yet how ENSO will respond to a warming world is uncertain and a greatly debated topic. The Intergovernmental Panel on Climate...
Mountain glaciers are receding worldwide with numerous consequences including changing hydrology and geomorphology. This study focuses on changes in glacier area on Mt. Hood, Oregon and Mt. Rainier, Washington where damaging debris flows have occurred in glaciated basins. Landsat imagery is used to map debris-free ice on a decadal time...
Increasing demand for exploitation of natural resources
in federal-municipal watersheds in the Western United
States has caused conflicts involving municipalities, the
U.S. Forest Service, and community interest groups. Better
understanding of the resource management process is needed
to help resolve these conflicts.
The objectives of this study were to document...
Power planning efforts in Oregon require accurate information
about hydroelectric potential. Potential uses for Geographic Information
Systems (GISs) are being investigated by three Oregon planning agencies.
This paper presents a method in which a 616 is used to help identify and
reduce uncertainty in previous hydroelectric inventories. Uncertainty with
respect...
The present day vegetation pattern of the Willamette Valley is a result of a long past of human alteration of the landscape. Beginning with aboriginal burning of the grasslands to present day land uses, the vegetation of the valley has been affected by anthropogenic activity. Wet prairie is a vanishing...
While many geographers believe that the regional
concept is central to geographic study, no definitive regional
scheme exists. The criteria considered in each regional study
will relate to a stated objective or study. Ecological
regionalization is a major contribution by geographers to
environmental studies. By examining spatial patterns of factors...
Mean annual runoff to precipitation (R/P) ratios were generated for 966 watersheds within the contiguous United States. The watersheds were plotted using Arc View GIS and used as part of an overlay analysis with Level 1 U.S. ecoregions. The ratios were statistically evaluated to determine anomalous R/P conditions within the...
Cultural resource inventories have identified,205 individual sites
on public land along the Lower Salmon River, Idaho. These sites
represent a rich and diverse record of the human occupation and
utilization of the river canyon during the past 10,000 years. Each
of these 205 sites contains its own unique record of...
The key to developing successful environmental interpretation is sound
planning. This paper is a discussion of the principles of environmental interpretation
and how they apply to the planning process. The Coburg Wetland is a 21 acre
reserve located on the west side of lnterstate-5 in Coburg, Oregon. The city of...
