Geomorphic response to restoration and disturbance: Grazing, fire, and flooding on the Middle Fork John Day River, OR
MetadataShow full item record
Salmon habitat restoration is ongoing at a Nature Conservancy preserve on the Middle Fork John Day River in the Columbia River Basin in north-central Oregon. The site has a long history of disturbance including dredge mining upstream, channelization, grazing, logging, fire, and floods. Using historic aerial photos, habitat unit surveys, and cross sectional profiles, this thesis shows how the channel morphology, particularly habitat unit diversity, has changed since 1939, just before placer mining began. Results show that the dominant influence on present day channel morphology is channelization from the 1930's. Other changes including dredge mining in the late 1930's to early 1940's, cessation of cattle grazing in 1991, and a fire followed by a flood in the winter of 1996-1997, had less impact because of the straightened, stabilized channel morphology.
Showing items related by title, author, creator and subject.
Ethnomalacology and Paleoecology of the Round Butte Archaeological Sites, Deschutes River Basin, Oregon Roscoe, Ernest J. (Museum of Natural History, University of OregonMuseum of Natural History, University of Oregon, 1967-07)This report is based upon a study of the molluscan material recovered from twelve sites excavated by field parties from the Anthropology Department, University of Oregon, in the Middle Deschutes River Basin in ...
The efficacy of middle school indicators to predict the academic and behavioral performance of at-risk ninth graders McKee, Michael Todd (University of Oregon, 2009-06)Dropping out of high school may have individual as well as social implications. The process of dropping out is attributed to social and academic risk factors. Attendance, course completion and grade-point-average have been ...
Uballez, Brian (2009)Although our Math scores on the Oregon Statewide Assessments have shown an overall improvement since 2006 (an increase of 4%), our scores dropped 2% from 2008 to 2009. We want to continue raising our Math scores in hopes ...