Preprints
https://doi.org/10.5194/esurf-2021-60
https://doi.org/10.5194/esurf-2021-60
28 Jul 2021
 | 28 Jul 2021
Status: this preprint was under review for the journal ESurf. A final paper is not foreseen.

Linear stability analysis of plane beds under flows with suspended load

Koji Ohata, Hajime Naruse, and Norihiro Izumi

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.

This preprint has been withdrawn.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Koji Ohata, Hajime Naruse, and Norihiro Izumi

Interactive discussion

Status: closed

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
    • AC1: 'Reply on RC1', Koji Ohata, 17 Oct 2021
  • RC2: 'Comment on esurf-2021-60', Anonymous Referee #2, 13 Sep 2021
    • AC2: 'Reply on RC2', Koji Ohata, 17 Oct 2021
  • EC1: 'Comment on esurf-2021-60', Eric Lajeunesse, 16 Sep 2021
    • AC3: 'Reply on EC1', Koji Ohata, 17 Oct 2021

Interactive discussion

Status: closed

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
    • AC1: 'Reply on RC1', Koji Ohata, 17 Oct 2021
  • RC2: 'Comment on esurf-2021-60', Anonymous Referee #2, 13 Sep 2021
    • AC2: 'Reply on RC2', Koji Ohata, 17 Oct 2021
  • EC1: 'Comment on esurf-2021-60', Eric Lajeunesse, 16 Sep 2021
    • AC3: 'Reply on EC1', Koji Ohata, 17 Oct 2021
Koji Ohata, Hajime Naruse, and Norihiro Izumi
Koji Ohata, Hajime Naruse, and Norihiro Izumi

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Latest update: 09 Oct 2024
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This preprint has been withdrawn.

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.