Holocene Floodplain Development of the Lower Sycan River, Oregon

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dc.contributor.authorLind, Pollyanna, 1970-
dc.date.accessioned2010-02-05T22:49:42Z
dc.date.available2010-02-05T22:49:42Z
dc.date.issued2009-12
dc.descriptionxv, 203 p. : ill. (some col.) A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.en_US
dc.description.abstractWater and pumice accumulated behind a dam that, upon failure, scoured the c1aydominated floodplain and deposited pumice sands across the Sycan Valley. The pumice originated from the eruption of Mount Mazama (approximately 7660 ybp), and dam failure occurred very shortly afterwards. In response to the flood the lower Sycan River underwent episodes of channel aggradation and degradation. This study presents the history of channel evolution for the lower Sycan River from 11,000 years ago to present, based on floodplain stratigraphy and radiocarbon chronology. Seven primary periods of channel and floodplain development are identified: I. Early Holocene Dynamic Equilibrium; II: Sycan Outburst Flood; III. Initial Channel Formation; IV. Degradation & Widening; V. Aggradation & Lateral Migration; VI. (Secondary) Degradation & Widening; VII. Modern Dynamic Equilibrium. The active floodplain of the modern lower Sycan River is flanked by terraces of the rapidly abandoned Sycan Outburst Flood deposits.en_US
dc.description.sponsorshipCommittee in Charge: Dr. Patricia McDowell, Chair; Dr. Jim E. O'Connor; Dr. Andrew Marcusen_US
dc.identifier.urihttps://hdl.handle.net/1794/10171
dc.language.isoen_USen_US
dc.publisherUniversity of Oregonen_US
dc.relation.ispartofseriesUniversity of Oregon theses, Dept. of Geography, M.S., 2009;
dc.subjectFloodplains -- Oregon -- Sycan River Valley
dc.subjectSycan River Valley (Or.)
dc.titleHolocene Floodplain Development of the Lower Sycan River, Oregonen_US
dc.typeThesisen_US

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