CHANNEL RESPONSE TO SEDIMENT WAVE PROPAGATION AND MOVEMENT, REDWOOD CREEK, CALIFORNIA, USA
1996; Wiley; Volume: 21; Issue: 10 Linguagem: Inglês
10.1002/(sici)1096-9837(199610)21
ISSN1096-9837
Autores Tópico(s)Geological formations and processes
ResumoEarth Surface Processes and LandformsVolume 21, Issue 10 p. 911-927 Research Article CHANNEL RESPONSE TO SEDIMENT WAVE PROPAGATION AND MOVEMENT, REDWOOD CREEK, CALIFORNIA, USA MARY ANN MADEJ, Corresponding Author MARY ANN MADEJ US National Biological Service, Redwood National Park Field Station, 1125 16th Street, Arcata, California 95521, USAUS National Biological Service, Redwood National Park Field Station, 1125 16th Street, Arcata, California 95521, USASearch for more papers by this authorVICKI OZAKI, VICKI OZAKI Redwood National Park, 1125 16th Street, Arcata, California 95521, USASearch for more papers by this author MARY ANN MADEJ, Corresponding Author MARY ANN MADEJ US National Biological Service, Redwood National Park Field Station, 1125 16th Street, Arcata, California 95521, USAUS National Biological Service, Redwood National Park Field Station, 1125 16th Street, Arcata, California 95521, USASearch for more papers by this authorVICKI OZAKI, VICKI OZAKI Redwood National Park, 1125 16th Street, Arcata, California 95521, USASearch for more papers by this author First published: October 1996 https://doi.org/10.1002/(SICI)1096-9837(199610)21:10 3.0.CO;2-1Citations: 205AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract Redwood Creek, north coastal California, USA, has experienced dramatic changes in channel configuration since the 1950s. A series of large floods (in 1955, 1964, 1972 and 1975) combined with the advent of widespread commercial timber harvest and road building resulted in extensive erosion in the basin and contributed high sediment loads to Redwood Creek. Since 1975, no peak flows have exceeded a 5 year recurrence interval. Twenty years of cross-sectional survey data document the downstream movement of a ‘sediment wave’ in the lower 26 km of this gravel-bedded river at a rate of 800 to 1600 m a−1 during this period of moderately low flows. Higher transit rates are associated with reaches of higher unit stream power. The wave was initially deposited at a site with an abrupt decrease in channel gradient and increase in channel width. The amplitude of the wave has attenuated more than 1 m as it moved downstream, and the duration of the wave increased from eight years upstream to more than 20 years downstream. Channel aggradation and subsequent degradation have been accommodated across the entire channel bed. Channel width has not decreased significantly after initial channel widening from large (>25 year recurrence interval) floods. Three sets of longitudinal surveys of the streambed showed the highest increase in pool depths and frequency in a degrading reach, but even the aggrading reach exhibited some pool development through time. The aggraded channel bed switched from functioning as a sediment sink to a significant sediment source as the channel adjusted to high sediment loads. From 1980 to 1990, sediment eroded from temporary channel storage represented about 25 per cent of the total sediment load and 95 per cent of the bedload exported from the basin. Citing Literature Volume21, Issue10October 1996Pages 911-927 RelatedInformation
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