Bed-slope-related diffusion of an erodible hump
Bed-slope-related diffusion of an erodible hump
In certain conditions, the bed slope has a substantial influence on sediment transport rates and hence morphological evolution. Approaches to account for such influence usually suffer from a high degree of empiricism and/or mathematical complexity. We propose a bed slope related diffusivity parameter, derived from a morphodynamic model previously validated against empirical data for bedload transport on horizontal and steep sloping channels. The proposed diffusivity parameter is easy to include in a conventional morphodynamic model via the modification of a typical bedload formula originally developed for sediment transport in a nearly horizontal channel. A conventional model modified through this parameter proves to yield enhanced results in the case study of a submerged migrating sandbar, by avoiding the generation of unrealistic high-frequency oscillations in the bed profile, yet permitting the expected steepening of its downstream face with time. Other models derived for sloping channels do not satisfy the latter condition. It is also shown that unrealistic oscillations can be avoided through numerical means; however, their use should be interpreted carefully from a hydrodynamic and sedimentological viewpoint.
Maldonado-Villanueva, Sergio
b303ef8c-52d6-40ed-bf48-59efb4265a85
Creed, Maggie
09b435fa-0b43-422d-b399-2efe9a0a2774
Borthwick, Alistair
20792d04-a4e5-4e3d-8ba6-26e47128dd81
2017
Maldonado-Villanueva, Sergio
b303ef8c-52d6-40ed-bf48-59efb4265a85
Creed, Maggie
09b435fa-0b43-422d-b399-2efe9a0a2774
Borthwick, Alistair
20792d04-a4e5-4e3d-8ba6-26e47128dd81
Maldonado-Villanueva, Sergio, Creed, Maggie and Borthwick, Alistair
(2017)
Bed-slope-related diffusion of an erodible hump.
Wieprecht, Silke, Haun, Stefan, Weber, Karolin, Noack, Markus and Terheiden, Kristina
(eds.)
In River Sedimentation: Proceedings of the 13th International Symposium on River Sedimentation (Stuttgart, Germany, 19-22 September, 2016).
CRC Press..
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Conference or Workshop Item
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Abstract
In certain conditions, the bed slope has a substantial influence on sediment transport rates and hence morphological evolution. Approaches to account for such influence usually suffer from a high degree of empiricism and/or mathematical complexity. We propose a bed slope related diffusivity parameter, derived from a morphodynamic model previously validated against empirical data for bedload transport on horizontal and steep sloping channels. The proposed diffusivity parameter is easy to include in a conventional morphodynamic model via the modification of a typical bedload formula originally developed for sediment transport in a nearly horizontal channel. A conventional model modified through this parameter proves to yield enhanced results in the case study of a submerged migrating sandbar, by avoiding the generation of unrealistic high-frequency oscillations in the bed profile, yet permitting the expected steepening of its downstream face with time. Other models derived for sloping channels do not satisfy the latter condition. It is also shown that unrealistic oscillations can be avoided through numerical means; however, their use should be interpreted carefully from a hydrodynamic and sedimentological viewpoint.
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2016.ISRS_Stuttgart_Conferece.Preprint.Hump_diffusion_smv
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Published date: 2017
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Local EPrints ID: 418771
URI: http://eprints.soton.ac.uk/id/eprint/418771
PURE UUID: d11f6780-a8eb-4af0-a60b-2dbbae535c27
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Date deposited: 21 Mar 2018 17:30
Last modified: 16 Mar 2024 04:32
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Contributors
Author:
Maggie Creed
Author:
Alistair Borthwick
Editor:
Silke Wieprecht
Editor:
Stefan Haun
Editor:
Karolin Weber
Editor:
Markus Noack
Editor:
Kristina Terheiden
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