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Numerical simulation of hydrodynamics and bank erosion in a river bend

Numerical simulation of hydrodynamics and bank erosion in a river bend
Numerical simulation of hydrodynamics and bank erosion in a river bend
We present an integrated analysis of bank erosion in a high-curvature bend of the gravel bed Cecina River (central Italy). Our analysis combines a model of fluvial bank erosion with groundwater flow and bank stability analyses to account for the influence of hydraulic erosion on mass failure processes, the key novel aspect being that the fluvial erosion model is parameterized using outputs from detailed hydrodynamic simulations. The results identify two mechanisms that explain how most bank retreat usually occurs after, rather than during, flood peaks. First, in the high curvature bend investigated here the maximum flow velocity core migrates away from the outer bank as flow discharge increases, reducing sidewall boundary shear stress and fluvial erosion at peak flow stages. Second, bank failure episodes are triggered by combinations of pore water and hydrostatic confining pressures induced in the period between the drawdown and rising phases of multipeaked flow events.
riverbank erosion, riverbank retreat, fluvial erosion, mass failures, cecina river, italy
0043-1397
1
Rinaldi, Massimo
37a99621-c79d-4555-8d99-ea59c499c12f
Mengoni, Beatrice
356f1c1d-fb97-4772-824f-94f49ad598e3
Luppi, Laura
07c56f66-5e82-474c-b37b-65719cbeae7d
Darby, Stephen E.
4c3e1c76-d404-4ff3-86f8-84e42fbb7970
Mosselman, Erik
6399816a-57c4-4cbd-9383-556c7a2851e3
Rinaldi, Massimo
37a99621-c79d-4555-8d99-ea59c499c12f
Mengoni, Beatrice
356f1c1d-fb97-4772-824f-94f49ad598e3
Luppi, Laura
07c56f66-5e82-474c-b37b-65719cbeae7d
Darby, Stephen E.
4c3e1c76-d404-4ff3-86f8-84e42fbb7970
Mosselman, Erik
6399816a-57c4-4cbd-9383-556c7a2851e3

Rinaldi, Massimo, Mengoni, Beatrice, Luppi, Laura, Darby, Stephen E. and Mosselman, Erik (2008) Numerical simulation of hydrodynamics and bank erosion in a river bend. Water Resources Research, 44 (9), 1. (doi:10.1029/2008WR007008).

Record type: Article

Abstract

We present an integrated analysis of bank erosion in a high-curvature bend of the gravel bed Cecina River (central Italy). Our analysis combines a model of fluvial bank erosion with groundwater flow and bank stability analyses to account for the influence of hydraulic erosion on mass failure processes, the key novel aspect being that the fluvial erosion model is parameterized using outputs from detailed hydrodynamic simulations. The results identify two mechanisms that explain how most bank retreat usually occurs after, rather than during, flood peaks. First, in the high curvature bend investigated here the maximum flow velocity core migrates away from the outer bank as flow discharge increases, reducing sidewall boundary shear stress and fluvial erosion at peak flow stages. Second, bank failure episodes are triggered by combinations of pore water and hydrostatic confining pressures induced in the period between the drawdown and rising phases of multipeaked flow events.

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More information

Published date: 20 September 2008
Keywords: riverbank erosion, riverbank retreat, fluvial erosion, mass failures, cecina river, italy
Organisations: Environmental Processes & Change

Identifiers

Local EPrints ID: 64303
URI: https://eprints.soton.ac.uk/id/eprint/64303
ISSN: 0043-1397
PURE UUID: 5405318c-9fee-456b-a055-a8e008d3096f
ORCID for Stephen E. Darby: ORCID iD orcid.org/0000-0001-8778-4394

Catalogue record

Date deposited: 23 Dec 2008
Last modified: 14 Mar 2019 01:49

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