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Linear-stability analysis of plane beds under flows with suspended loads

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 fo...

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Published in:	Earth surface dynamics 2023-10, Vol.11 (5), p.961-977
Main Authors:	Ohata, Koji, Naruse, Hajime, Izumi, Norihiro
Format:	Article
Language:	English
Subjects:	Analysis Bed load Channel flow Cross laminating Dunes Flow control Flow velocity Geomorphology Laminated materials Lamination Loads (forces) Marine environment Open channel flow Reynolds number Sandstone Sediment transport Sedimentary rocks Stability analysis Suspended load Theoretical analysis Turbidites Turbidity Turbidity currents Viscosity
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container_title	Earth surface dynamics
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creator	Ohata, Koji Naruse, Hajime Izumi, Norihiro
description	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 loads. Here, we perform, for the first time, linear-stability analysis to show that flows with suspended loads facilitate the formation of plane beds. For a fine-grained bed, a 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 loads promote the formation of plane beds, which suggests that the development of dunes under turbidity currents is suppressed by the presence of suspended loads.
doi_str_mv	10.5194/esurf-11-961-2023
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subjects	Analysis Bed load Channel flow Cross laminating Dunes Flow control Flow velocity Geomorphology Laminated materials Lamination Loads (forces) Marine environment Open channel flow Reynolds number Sandstone Sediment transport Sedimentary rocks Stability analysis Suspended load Theoretical analysis Turbidites Turbidity Turbidity currents Viscosity
title	Linear-stability analysis of plane beds under flows with suspended loads
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