Dimensionless argument: a narrow grain size range near 2 mm plays a special role in river sediment transport and morphodynamics

Gary Parker, Chenge An, Michael P Lamb, Marcelo H Garcia, Elizabeth H Dingle, Jeremy G Venditti

Research output: Contribution to journalArticlepeer-review

Abstract

River morphology has traditionally been divided by the size 2 mm. We use dimensionless arguments to show that particles in the 1–5 mm range (i) are the finest range not easily suspended by alluvial flood flows, (ii) are transported preferentially over coarser gravel, and (iii), within limits, are also transported preferentially over sand. We show how fluid viscosity mediates the special status of sediment in this range.
Original languageEnglish (US)
Pages (from-to)367-380
JournalEarth Surface Dynamics
Volume12
Issue number1
DOIs
StatePublished - Feb 15 2024

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