The Salem and Eugene-Springfield Urban Areas are faced with the
task of managing the flood plain lands which lie near them. In
the past, flood plain usage was not regulated and many dollars worth
of damage has occurred to land and structures. This type of thinking
is now changing, and...
The loss of important agricultural land is
presently a highly significant resource problem. Urbanization
processes, such as subdivision development in
urban fringe areas, is a primary factor in converting
agricultural land to urban land. The State of Oregon has
addressed this issue by requiring all cities and urban
counties to...
Increasing population and land use decisions have had a negative effect on the aquatic ecosystems in the Willamette River Basin. One result is elevated temperatures in many of the Basin’s streams, which adversely affect the fish that live in these streams. There are several regulatory mechanisms in place to improve...
The purpose of this study was to better understand the level of
wetland classification consistency among three different land cover layers
created using Geographical Information System (GIS) and remote sensor
technology. Where inconsistencies in data existed, the goal was to identify the
kinds of inconsistencies that occur. The results were...
Visualizing large movement datasets with flow maps is difficult because overlapping flows create significant graphical conflicts that make accurate interpretation difficult or impossible. Interactive flow mapping applications allow users to explore large movement datasets by automatically generating flow maps from subsets of the data in response to queries by the...
This study was conducted to explore differences in diversity and abundance of small
mammal populations in natural and restored wet prairies in Oregon's Willamette Valley.
Mammals were live-trapped in eight Willamette Valley wet prairies (four natural remnants and
four restorations) during the summer of 2000; population abundance estimates for each...
Invasion by exotic species can pose a major challenge for developing native
plant communities in wetland restoration projects. Often native plant communities
do not develop as anticipated in restored wetlands due to colonization by exotic
species that dominate the native plant community. Despite the time and expense to
restore wetlands,...
Montane meadows in the western Cascades of Oregon occupy approximately 5% of the landscape, but contribute greatly to the region's biodiversity. Western Cascades meadows are dynamic parts of the landscape and have contracted by over 50% in the past two hundred years in the HJ Andrews Experimental Forest (hereafter Andrews...
Temporal and spatial patterns of daytime cloudiness in the
Willamette Valley of Oregon were studied by utilizing monthly and
daily sky cover data published by the U. S. Weather Bureau for the
Portland, Salem, and Eugene stations. The 15-year period, 1949
through 1963, was selected as the maximum reliable period...
The needs and markets for aerial photography have grown
steadily with the increasing demands for improved resource
management (Kodak, 1985, 2 & Simonett, 1983, 1). Aerial
photography within the Willamette Valley could provide researchers
and professionals with a broad range of data in disciplines such as
agriculture, forestry, geology, and...