Number and size of last-glacial Missoula floods in the Columbia River valley between the Pasco Basin, Washington, and Portland, Oregonстатья из журнала
Аннотация: Research Article| May 01, 2003 Number and size of last-glacial Missoula floods in the Columbia River valley between the Pasco Basin, Washington, and Portland, Oregon Gerardo Benito; Gerardo Benito 1Consejo Superior de Investigaciones Científicas, Centro de Ciencias Medioambientales, Serrano 115 bis, 28006 Madrid, Spain Search for other works by this author on: GSW Google Scholar Jim E. O'Connor Jim E. O'Connor 2U.S. Geological Survey, 10615 SE Cherry Blossom Drive, Portland, Oregon 97216, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Gerardo Benito 1Consejo Superior de Investigaciones Científicas, Centro de Ciencias Medioambientales, Serrano 115 bis, 28006 Madrid, Spain Jim E. O'Connor 2U.S. Geological Survey, 10615 SE Cherry Blossom Drive, Portland, Oregon 97216, USA Publisher: Geological Society of America Received: 11 Apr 2002 Revision Received: 12 Nov 2002 Accepted: 22 Nov 2002 First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2003) 115 (5): 624–638. https://doi.org/10.1130/0016-7606(2003)115<0624:NASOLM>2.0.CO;2 Article history Received: 11 Apr 2002 Revision Received: 12 Nov 2002 Accepted: 22 Nov 2002 First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Gerardo Benito, Jim E. O'Connor; Number and size of last-glacial Missoula floods in the Columbia River valley between the Pasco Basin, Washington, and Portland, Oregon. GSA Bulletin 2003;; 115 (5): 624–638. doi: https://doi.org/10.1130/0016-7606(2003)115<0624:NASOLM>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Field evidence and radiocarbon age dating, combined with hydraulic flow modeling, provide new information on the magnitude, frequency, and chronology of late Pleistocene Missoula floods in the Columbia River valley between the Pasco Basin, Washington, and Portland, Oregon. More than 25 floods had discharges of >1.0 × 106 m3/s. At least 15 floods had discharges of >3.0 × 106 m3/s. At least six or seven had peak discharges of >6.5 × 106 m3/s, and at least one flood had a peak discharge of ∼10 × 106 m3/s, a value consistent with earlier results from near Wallula Gap, but better defined because of the strong hydraulic controls imposed by critical flow at constrictions near Crown and Mitchell Points in the Columbia River Gorge.Stratigraphy and geomorphic position, combined with 25 radiocarbon ages and the widespread occurrence of the ca. 13 ka (radiocarbon years) Mount St. Helens set-S tephra, show that most if not all the Missoula flood deposits exposed in the study area were emplaced after 19 ka (radiocarbon years), and many were emplaced after 15 ka. More than 13 floods perhaps postdate ca. 13 ka, including at least two with discharges of >6 × 106 m3/s.From discharge and stratigraphic relationships upstream, we hypothesize that the largest flood in the study reach resulted from a Missoula flood that predated blockage of the Columbia River valley by the Cordilleran ice sheet. Multiple later floods, probably including the majority of floods recorded by fine- and coarse-grained deposits in the study area, resulted from multiple releases of glacial Lake Missoula that spilled into a blocked and inundated Columbia River valley upstream of the Okanogan lobe and were shunted south across the Channeled Scabland. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Год издания: 2003
Авторы: Gerardo Benito, Jim E. O’Connor
Издательство: Geological Society of America
Источник: Geological Society of America Bulletin
Ключевые слова: Hydrology and Sediment Transport Processes, Archaeology and Natural History, Geology and Paleoclimatology Research
Открытый доступ: closed
Том: 115
Страницы: 624–638