The relative contribution of near-bed vs. intragravel horizontal transport to fine sediment accumulation processes in river gravel beds
Roser Casas-Mulet, Garima Lakhanpal, Michael J Stewardson
GEOMORPHOLOGY | ELSEVIER SCIENCE BV | Published : 2018
Understanding flow-sediment interactions is important for comprehending river functioning. Fine sediment accumulation processes, in particular, have key implications for ecosystem health. However, the amount of fines generated by intragravel flows and later accumulated in gravel streambeds may have been underestimated, as the hydraulic-related driving transport mechanisms in play are not clearly identified. Specifically, the relative contribution of fines from upper vs. lower sediment layers in gravel beds is not well understood. By recreating flooded and dewatered conditions in an experimental flume filled with natural sediment, we estimated such contributions by observing and collecting in..View full abstract
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Awarded by Australian Research Council
This work was supported by the Australian Research Council through two projects DP130103619 and LP130100174. We are grateful to A/Prof Ian Rutherfurd for valuable suggestions on the manuscript. We also thank Prof Richard Whittecar and one other anonymous reviewer for their comments and suggestions that greatly improved the final manuscript.