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Open Access Entrainment Thresholds of Naturally-shaped Fluvial and Marine Gravel (Granule) Sediments: A Laboratory Study

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Using uniform beds and unidirectional flow conditions, the entrainment thresholds of naturally-shaped fluvial and marine gravels of granule size (2–4 mm) are determined by laboratory flume experiments. Microscopic shape analysis shows that fluvial sediments are more angular than beach gravels. For a given grain size, critical bed shear stress (τo ) in fluvial sediments is 47.6% lower than that recorded for marine gravels; efficiency of entrainment is related primarily to shape effects, in terms of protrusion. This difference in the bed shear stress requirement for 'threshold' identifies the problems of adopting empirical relationships irrespective of environmental setting.

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Document Type: Research Article

Publication date: September 1, 2001

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