Preprints
https://doi.org/10.5194/esurf-2021-60
https://doi.org/10.5194/esurf-2021-60

  28 Jul 2021

28 Jul 2021

Review status: this preprint is currently under review for the journal ESurf.

Linear stability analysis of plane beds under flows with suspended load

Koji Ohata1, Hajime Naruse1, and Norihiro Izumi2 Koji Ohata et al.
  • 1Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University, Japan
  • 2Division of Field Engineering for the Environment, Faculty of Engineering, Hokkaido University, Japan

Abstract. Plane beds develop under flows in fluvial and marine environments; they are recorded as parallel lamination in sandstone beds, such as those found in turbidites. However, whereas turbidites typically exhibit parallel lamination, they rarely feature dune-scale cross lamination. Although the reason for the scarcity of dune-scale cross-lamination in turbidites is still debated, the formation of dunes may be dampened by suspended load. Here, we perform, for the first time, linear stability analysis to show that flows with suspended load facilitate the formation of plane beds. For a fine-grained bed, suspended load can promote the formation of plane beds and dampen the formation of dunes. These results of theoretical analysis were verified with observational data of plane beds under open-channel flows. Our theoretical analysis found that suspended load promotes the formation of plane beds, which suggest that the development of dunes under turbidity currents is suppressed by the presence of suspended load.

Koji Ohata et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on esurf-2021-60', Anonymous Referee #1, 12 Aug 2021
  • RC2: 'Comment on esurf-2021-60', Anonymous Referee #2, 13 Sep 2021
  • EC1: 'Comment on esurf-2021-60', Eric Lajeunesse, 16 Sep 2021

Koji Ohata et al.

Koji Ohata et al.

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Short summary
We investigated the influence of sediment transport modes on the formation of bedforms using theoretical analysis. The results of the theoretical analysis were verified with published data of plane beds obtained by fieldwork and laboratory experiments. We found that suspended sand particles can promote the formation of plane beds on a fine-grained bed, which suggests that the presence of suspended particles suppresses the development of dunes under submarine sediment-laden gravity currents.