Articles | Volume 12, issue 1
Research article
15 Feb 2024
Research article |  | 15 Feb 2024

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, and Jeremy G. Venditti


Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-1705', Enrica Viparelli, 14 Sep 2023
  • RC2: 'Comment on egusphere-2023-1705', Anonymous Referee #2, 15 Sep 2023
  • AC1: 'Response to Referee Comments', Gary Parker, 17 Oct 2023

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Gary Parker on behalf of the Authors (17 Oct 2023)  Author's response   Manuscript 
EF by Sarah Buchmann (19 Oct 2023)  Author's tracked changes 
ED: Publish as is (09 Nov 2023) by Jens Turowski
ED: Publish as is (14 Nov 2023) by Niels Hovius (Editor)
AR by Gary Parker on behalf of the Authors (07 Dec 2023)  Manuscript 
Short summary
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.