TY - GEN
T1 - Concave-upward composite river bank profile shape at migrating meander bends
AU - Waterman, D. M.
AU - García, M. H.
N1 - Publisher Copyright:
© 2016 Taylor & Francis Group, London.
PY - 2016
Y1 - 2016
N2 - In this investigation, we performed an analytical treatment of the sediment mass conservation equation applied to bank material mobilized as bedload (the non-cohesive coarse-grained lower layer of the composite river bank) to ascertain details about bank profile shape. The bank profile has a significant influence on meander migration rates when implementing a parallel migration assumption in physically-based erosion algorithms in meandering river migration models. However, such profiles are not readily specified a priori, as they are part of the solution of the problem. The analysis revealed that a straight-forward analytical function to express the shape for a parallel-migrating bank was not tractable; however, the necessity of the bank profile to be concave-upwards to satisfy the simplified governing equations was demonstrated. This contradicts predictions made by commonly used models that implement an excess shear stress formulation for entrainment rate without incorporating sediment flux divergence terms in the mass conservation equation.
AB - In this investigation, we performed an analytical treatment of the sediment mass conservation equation applied to bank material mobilized as bedload (the non-cohesive coarse-grained lower layer of the composite river bank) to ascertain details about bank profile shape. The bank profile has a significant influence on meander migration rates when implementing a parallel migration assumption in physically-based erosion algorithms in meandering river migration models. However, such profiles are not readily specified a priori, as they are part of the solution of the problem. The analysis revealed that a straight-forward analytical function to express the shape for a parallel-migrating bank was not tractable; however, the necessity of the bank profile to be concave-upwards to satisfy the simplified governing equations was demonstrated. This contradicts predictions made by commonly used models that implement an excess shear stress formulation for entrainment rate without incorporating sediment flux divergence terms in the mass conservation equation.
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U2 - 10.1201/9781315644479-175
DO - 10.1201/9781315644479-175
M3 - Conference contribution
AN - SCOPUS:85015261482
SN - 9781138029132
T3 - River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016
SP - 1098
EP - 1105
BT - River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016
A2 - Constantinescu, George
A2 - Garcia, Marcelo
A2 - Hanes, Dan
PB - CRC Press/Balkema
T2 - International Conference on Fluvial Hydraulics, RIVER FLOW 2016
Y2 - 11 July 2016 through 14 July 2016
ER -