Four Aerial LiDAR survey were used to examine the impacts of the 2007 removal of the Marmot Dam on the Sandy River, Oregon. Geomorphic Change Detection software was used to answer three project goals: 1) to investigate how the dam removal affected sediment distribution in the lower reach of the river, several km downstream of the dam, 2) to determine whether the pulse of sediment from the dam removal created a detectable, successive downstream accumulation of sediment through time, and 3) to assess the effect of natural high-flow events on the sediment distribution related to the dam removal. The results showed that a sediment pulse could be identified and tracked up to 13 km downstream from the former dam, but below that the pulse could not be detected from normal river processes. A majority of the sediment deposited from the dam release moved downstream as a result of high-flow events during winter months.
","abstract_html":"<p>Four Aerial LiDAR survey were used to examine the impacts of the 2007 removal of the Marmot Dam on the Sandy River, Oregon. Geomorphic Change Detection software was used to answer three project goals: 1) to investigate how the dam removal affected sediment distribution in the lower reach of the river, several km downstream of the dam, 2) to determine whether the pulse of sediment from the dam removal created a detectable, successive downstream accumulation of sediment through time, and 3) to assess the effect of natural high-flow events on the sediment distribution related to the dam removal. The results showed that a sediment pulse could be identified and tracked up to 13 km downstream from the former dam, but below that the pulse could not be detected from normal river processes. A majority of the sediment deposited from the dam release moved downstream as a result of high-flow events during winter months.</p>","abstract_has_math":false,"creators":["Matzek, Carl Daniel"],"institution":null,"degree_name":"Master of Science (MS)","degree_level":null,"degree_discipline":"Geological Sciences","degree_department":null,"school":null,"contributors":["Lisa L. Ely","Jim O'Connor","Anne Egger"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2013,"date_issued":"2013-01-01T08:00:00Z","date_published":"2013-01-01T08:00:00Z","updated_at":"2026-07-24T01:37:54Z","subjects":["sediment","river health","dam removal","Oregon","Environmental Monitoring","Fresh Water Studies","Hydrology","Sedimentology","Water Resource Management"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://digitalcommons.cwu.edu/etd/1446","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Lisa L. Ely","Jim O'Connor","Anne Egger"]},{"key":"dc:creator","label":"Author","values":["Matzek, Carl Daniel"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.available","label":"Dc Date Available","values":["2020-12-17T08:00:00Z"]},{"key":"dc:type","label":"Dc Type","values":["Text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Geological Sciences"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science (MS)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["sediment","river health","dam removal","Oregon","Environmental Monitoring","Fresh Water Studies","Hydrology","Sedimentology","Water Resource Management"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://digitalcommons.cwu.edu/etd/1446"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Four Aerial LiDAR survey were used to examine the impacts of the 2007 removal of the Marmot Dam on the Sandy River, Oregon. Geomorphic Change Detection software was used to answer three project goals: 1) to investigate how the dam removal affected sediment distribution in the lower reach of the river, several km downstream of the dam, 2) to determine whether the pulse of sediment from the dam removal created a detectable, successive downstream accumulation of sediment through time, and 3) to assess the effect of natural high-flow events on the sediment distribution related to the dam removal. The results showed that a sediment pulse could be identified and tracked up to 13 km downstream from the former dam, but below that the pulse could not be detected from normal river processes. A majority of the sediment deposited from the dam release moved downstream as a result of high-flow events during winter months.
"]},{"key":"dc:title","label":"Title","values":["LiDAR Assessment of Sediment Transport Related to the Removal of the Marmot Dam, Sandy River, Oregon"]}]}],"canonical_facts":{"dc:contributor":["Lisa L. Ely","Jim O'Connor","Anne Egger"],"dc:creator":["Matzek, Carl Daniel"],"dc:date.available":["2020-12-17T08:00:00Z"],"dc:description.abstract":["Four Aerial LiDAR survey were used to examine the impacts of the 2007 removal of the Marmot Dam on the Sandy River, Oregon. Geomorphic Change Detection software was used to answer three project goals: 1) to investigate how the dam removal affected sediment distribution in the lower reach of the river, several km downstream of the dam, 2) to determine whether the pulse of sediment from the dam removal created a detectable, successive downstream accumulation of sediment through time, and 3) to assess the effect of natural high-flow events on the sediment distribution related to the dam removal. The results showed that a sediment pulse could be identified and tracked up to 13 km downstream from the former dam, but below that the pulse could not be detected from normal river processes. A majority of the sediment deposited from the dam release moved downstream as a result of high-flow events during winter months.
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