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Comparing the Sensitivity of Bank Retreat to Changes in Biophysical Conditions between Two Contrasting River Reaches Using a Coupled Morphodynamic Model

Title:

Comparing the Sensitivity of Bank Retreat to Changes in Biophysical Conditions between Two Contrasting River Reaches Using a Coupled Morphodynamic Model

Rousseau, Yannick Y., Biron, Pascale M. and Van de Wiel, Marco J. (2018) Comparing the Sensitivity of Bank Retreat to Changes in Biophysical Conditions between Two Contrasting River Reaches Using a Coupled Morphodynamic Model. Water, 10 (4). p. 518. ISSN 2073-4441

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Official URL: http://dx.doi.org/10.3390/w10040518

Abstract

Morphodynamic models of river meandering patterns and dynamics are based on the premise that the integration of biophysical processes matching those operating in natural rivers should result in a better fit with observations. Only a few morphodynamic models have been applied to natural rivers, typically along short reaches, and the relative importance of biophysical parameters remains largely unknown in these cases. Here, a series of numerical simulations were run using the hydrodynamic solver TELEMAC-2D, coupled to an advanced physics-based geotechnical module, to verify if sensitivity to key biophysical conditions differs substantially between two natural meandering reaches of different scale and geomorphological context. The model was calibrated against observed measurements of bank retreat for a 1.5 km semi-alluvial meandering reach incised into glacial till (Medway Creek, Ontario, Canada) and an 8.6 km long sinuous alluvial reach of the St. François River (Quebec, Canada). The two river reaches have contrasting bed and bank composition, and they differ in width by one order of magnitude. Calibration was performed to quantify and contrast the contribution of key geotechnical parameters, such as bank cohesion, to bank retreat. Results indicate that the sensitivity to key geotechnical parameters is dependent on the biophysical context and highly variable at the sub-reach scale. The homogeneous sand-bed St. François River is less sensitive to cohesion and friction angle than the more complex Medway Creek, flowing through glacial-till deposits. The latter highlights the limits of physics-based models for practical purposes, as the amount and spatial resolution of biophysical parameters required to improve the agreement between simulation results and observations may justify the use of a reduced complexity modelling approach.

Divisions:Concordia University > Faculty of Arts and Science > Geography, Planning and Environment
Item Type:Article
Refereed:Yes
Authors:Rousseau, Yannick Y. and Biron, Pascale M. and Van de Wiel, Marco J.
Journal or Publication:Water
Date:2018
Funders:
  • Concordia Open Access Author Fund
  • National Sciences and Engineering Research Council of Canada (NSERC)
Digital Object Identifier (DOI):10.3390/w10040518
Keywords:river bank erosion; meandering; morphodynamics; geotechnical slope stability; model calibration
ID Code:983803
Deposited By: DANIELLE DENNIE
Deposited On:26 Apr 2018 16:58
Last Modified:26 Apr 2018 16:58

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