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The dominance of dispersion in the evolution of bed material waves in gravel-bed riversAuthor(s): Thomas E. Lisle; Yantao Cui; Gary Parker; James E. Pizzuto; Annjanette M. Dodd
Source: Earth Surface Processes and Landforms 26(13): 1409-1420.
Publication Series: Miscellaneous Publication
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DescriptionAbstract - Bed material waves are temporary zones of sediment accumulation created by large sediment inputs. Recent theoretical, experimental and ﬁeld studies examine factors in ﬂuencing dispersion and translation of bed material waves in quasi-uniform, gravel-bed channels. Exchanges of sediment between a channel and its ﬂoodplain are neglected. Within these constraints, two factors inﬂuence relative rates of dispersion and translation: (1) interactions between wave topography, ﬂow and bed load transport; and (2) particle-size differences between wave material and original bed material. Our results indicate that dispersion dominates the evolution of bed material waves in gravel-bed channels. Signiﬁcant translation requires a low Froude number, which is uncharacteristic of gravel-bed channels, and low wave amplitude which, for a large wave, can be achieved only after substantial dispersion. Wave material of small particle size can promote translation, but it primarily increases bed load transport rate and thereby accelerates wave evolution. Copyright 2001 John Wiley & Sons, Ltd.
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CitationLisle, Thomas E.; Cui, Yantao; Parker, Gary; Pizzuto, James E.; Dodd, Annjanette M. 2001. The dominance of dispersion in the evolution of bed material waves in gravel-bed rivers. Earth Surface Processes and Landforms 26(13): 1409-1420.
KeywordsPSW4351, bed material waves, bed load, gravel-bed rivers
- Fine bed material in pools of natural gravel bed channels
- Particle size variations between bed load and bed material in natural gravel bed channels
- Evolution of a sediment wave in an experimental channel
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