{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Charles Cannon", "hasEmail": "mailto:ccannon@usgs.gov"}, "description": "The Umpqua River drains 12,103 square kilometers (4,673 square miles) in southwest Oregon before flowing into \nthe Pacific Ocean at Winchester Bay near the city of Reedsport. In cooperation with the Portland District of the \nU.S. Army Corps of Engineers (USACE), the USGS evaluated sediment transport and gravel storage along the \ndownstream alluvial reaches of the North and South Umpqua Rivers and the entire mainstem Umpqua River. \nThis includes the lower 46.8 kilometers (29.1 miles) of the North Umpqua River and the lower 122.6 kilometers \n(76.2 miles) of the South Umpqua River. \n\t \nThe Umpqua River gravel transport study involved multiple analyses, including tracking patterns of historical \nchannel change and estimation of a sediment budget. To support these analyses, digital channel maps were\n produced to depict channel and floodplain conditions along the Umpqua River system from different time periods.\n\t\t\nGIS layers defining the active channel of the Umpqua River system were developed for three time periods: \n1939, 1967, and 2005. For the South Umpqua River and the 19 kilometers (12 miles) of the mainstem \nUmpqua River downstream from the confluence of the North and South Umpqua Rivers, GIS layers were \nalso developed for the time periods 1994, 2000, and 2009.\n\t\t\nFor this project, the active channel was defined as area typically inundated during annual high flows, and \nincludes the low-flow channel as well as side channels, islands, and channel-flanking gravel bars. The \nactive channel datasets were developed by digitizing from aerial photographs. Aerial photographs from \n1939 and 1967 were scanned, rectified, and mosaiced for this project. Digital orthophotographs from \n1994, 2000, 2005, and 2009 are publicly available (See metadata for each photograph set for more \ninformation on the rectification process and resolution of each dataset). Although our study area \nencompasses the Umpqua River and lower reaches of the North and South Umpqua Rivers, the \nextent of each dataset depended upon the underlying aerial photographs; for example, the 1967 \nphotographs extend only as far downstream as floodplain kilometer 7, whereas the 1939 and 2005 \ndatasets extend to the mouth of the Umpqua River at the Pacific Ocean.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9NLZQA4", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}, {"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.26241805-af5a-4f89-ac5e-fc38774c6b1c.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_26241805-af5a-4f89-ac5e-fc38774c6b1c", "keyword": ["Douglas County", "Oregon", "USGS:26241805-af5a-4f89-ac5e-fc38774c6b1c", "Umpqua River", "active channel", "environment", "fluvial geomorphology", "geoscientificInformation", "inlandWaters"], "modified": "2020-11-17T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-124.210823, 42.920612, -122.934737, 43.755980", "theme": ["geospatial"], "title": "Umpqua River Oregon Active Channel 1939"}