Processes of initiation of motion leading to bedload transport in gravel-bed rivers

Details Processes of initiation of motion leading to bedload transport in gravel-bed rivers Processes of initiation of motion leading to bedload transport in gravel-bed rivers

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3406403g&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 6, CiteID L06403

Physics

9

Hydrology: Erosion, Hydrology: Geomorphology: Fluvial (1625), Hydrology: Sediment Transport (4558)

Scientific paper

Transport processes that lead to the initiation of bedload motion in gravel-bed rivers have not yet been clarified. We report patch- and grain-scale processes involved in the initiation of bedload motion in a natural gravel-bed stream as observed through a series of video experiments. With increasing flow strength, the phases of initiation of motion that have been identified are (1) within-patch grain instability (grain vibration, pivoting, and grain-scale rolling), (2) within-patch gyratory step-and-rest motion, and (3) general sediment motion involving downstream transport from an individual patch and the throughput of grains inherited from upstream.

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