{"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 \nbefore flowing into the Pacific Ocean at Winchester Bay near the city of Reedsport. In cooperation \nwith the Portland District of the U.S. Army Corps of Engineers (USACE), the USGS evaluated \nsediment transport and gravel storage along the downstream alluvial reaches of the North and \nSouth Umpqua Rivers and the entire mainstem Umpqua River. This includes the lower 46.8 \nkilometers (29.1 miles) of the North Umpqua River and the lower 122.6 kilometers (76.2 miles) \nof the South Umpqua River. \n\t\t\nThe Umpqua River gravel transport study involved multiple analyses, including tracking patterns \nof historical channel change and estimation of a sediment budget. To support these analyses, \ndigital channel maps were produced to depict channel and floodplain conditions along the \nUmpqua River system from different time periods.\n\t\t\nGIS layers defining the active channel of the Umpqua River system were developed for three \ntime periods: 1939, 1967, and 2005. For the South Umpqua River and the 19 kilometers (12 miles) \nof the mainstem Umpqua River downstream from the confluence of the North and South Umpqua \nRivers, GIS layers were also 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 \nflows, and includes the low-flow channel as well as side channels, islands, and channel-flanking \ngravel bars. The active channel datasets were developed by digitizing from aerial photographs. \nAerial photographs from 1939 and 1967 were scanned, rectified, and mosaiced for this project. \nDigital orthophotographs from 1994, 2000, 2005, and 2009 are publicly available (See metadata \nfor each photograph set for more information on the rectification process and resolution of each \ndataset). Although our study area encompasses the Umpqua River and lower reaches of the \nNorth and South Umpqua Rivers, the extent of each dataset depended upon the underlying \naerial photographs; for example, the 1967 photographs extend only as far downstream as \nfloodplain kilometer 7, whereas the 1939 and 2005 datasets extend to the mouth of the \nUmpqua River at the Pacific Ocean.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9MVQCO0", "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.f499b51c-7f89-49e0-aefd-753c59b9ce46.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_f499b51c-7f89-49e0-aefd-753c59b9ce46", "keyword": ["Douglas County", "Oregon", "USGS:f499b51c-7f89-49e0-aefd-753c59b9ce46", "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": "-123.515137, 42.925749, -122.935283, 43.378060", "theme": ["geospatial"], "title": "Umpqua River Oregon Active Channel 2009"}