This paper reports peculiar results of experimental investigation on the evolution of flow secondary circulation motion along a meander wave. The experiments have been conducted in a large amplitude meandering laboratory channel for two values of the width-to-depth ratio. Attention is focalised on how secondary motion affects the bank shear stress distribution, influencing the bank stability. The analysis essentially highlights that, especially for small width-to-depth ratio, as the channel curvature increases besides the classical central-region secondary circulation cell a counter-rotating circulation cell forms in the outer-bank region. Such counter-rotating circulation cell allows to obtain small values of the bank shear stress at the outer bank.

Termini, D. (2009). Role of secondary circulation on bank erosion in a large amplitude meandering laboratory channel. In 31èmes Jounées de l’Hydraulique – Morphodynamics and sediment management in Estuaries, Bays and Deltas.

Role of secondary circulation on bank erosion in a large amplitude meandering laboratory channel

TERMINI, Donatella
2009-01-01

Abstract

This paper reports peculiar results of experimental investigation on the evolution of flow secondary circulation motion along a meander wave. The experiments have been conducted in a large amplitude meandering laboratory channel for two values of the width-to-depth ratio. Attention is focalised on how secondary motion affects the bank shear stress distribution, influencing the bank stability. The analysis essentially highlights that, especially for small width-to-depth ratio, as the channel curvature increases besides the classical central-region secondary circulation cell a counter-rotating circulation cell forms in the outer-bank region. Such counter-rotating circulation cell allows to obtain small values of the bank shear stress at the outer bank.
31èmes Jounées de l’Hydraulique – Morphodynamics and sediment management in Estuaries, Bays and Deltas
Parigi
22-23 September
2009
8
Termini, D. (2009). Role of secondary circulation on bank erosion in a large amplitude meandering laboratory channel. In 31èmes Jounées de l’Hydraulique – Morphodynamics and sediment management in Estuaries, Bays and Deltas.
Proceedings (atti dei congressi)
Termini, D
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/48058
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