Coupling Bank Stability and Bed Deformation Models to Predict Equilibrium Bed Topography in River Bends |
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Authors: | Ebrahim Amiri-Tokaldany Stephen E Darby Paul Tosswell |
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Affiliation: | 1Assistant Professor, Dept. of Irrigation and Reclamation Engineering, Faculty of Water and Soil Engineering, Univ. of Tehran, Karaj 31587-11167, Iran (corresponding author). E-mail: amiri@ut.ac.ir 2Senior Lecturer, School of Geography, Univ. of Southampton, Highfield, Southampton SO17 1BJ, U.K. E-mail s.e.darby@soton.ac.uk 3Senior Lecturere, School of Civil and Environmental Engineering, Univ. of Southampton, Highfield, Southampton SO17 1BJ, U.K. E-mail: pt2@soton.ac.uk
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Abstract: | Attempts to include river bank erosion predictors within morphological models are becoming increasingly common, but uncertainty surrounds the procedures used to couple bed deformation and bank erosion submodels in a way that maintains the mass continuity of eroded bank sediment. Herein we present a coupling procedure that comprises two discrete elements. First, immediately following bank failure, the slumped debris comes to rest at the bank toe as a planar surface inclined at an “angle of repose.” Second, we use a fractional transport model to simulate the subsequent erosion and deposition of the failed bank material debris. The method is demonstrated with an example in which an equilibrium bed topography model is combined with a river bank erosion model to predict the morphological response of a river bend to a large flow event. |
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Keywords: | Bank erosion Topography Morphology Sediment Rivers Deformation Equilibrium |
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