SHEAR INSTABILITY OF LONGSHORE CURRENTS: EFFECTS OF DISSIPATION AND NON-LINEARITY

Albert Falques; Vicente Iranzo; Miquel Caballeria

doi:10.9753/icce.v24.%p

No. 24 (1994), Conference Proceedings

No. 24 (1994)

SHEAR INSTABILITY OF LONGSHORE CURRENTS: EFFECTS OF DISSIPATION AND NON-LINEARITY

Conference Proceedings

https://doi.org/10.9753/icce.v24.%25p

Published 1994-01-29

Albert Falques⁺⁻
Vicente Iranzo⁺⁻
Miquel Caballeria⁺⁻

Albert Falques

Departament de Fisica Aplicada, Universitat Politecnica de Catalunya

Vicente Iranzo

Departament de Fisica Aplicada, Universitat Politecnica de Catalunya

Miquel Caballeria

Departament de Fisica Aplicada, Universitat Politecnica de Catalunya

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Keywords

shear instability
longshore current
current
dissipation
nonlinear current

How to Cite

Falques, A., Iranzo, V., & Caballeria, M. (1994). SHEAR INSTABILITY OF LONGSHORE CURRENTS: EFFECTS OF DISSIPATION AND NON-LINEARITY. Coastal Engineering Proceedings, 1(24). https://doi.org/10.9753/icce.v24.%p

Abstract

The effect of bottom friction and turbulent lateral mixing on shear instability of the longshore current is investigated. Transition conditions for this instability as a function of non-dimensional parameters related to the basic current, topography, bottom friction and lateral mixing are found. A direct nonlinear numerical simulation of shear instability is presented. The basic flow is found to be supercritical and the amplitude of shear waves can reach at least 20% of the basic flow. A small increase in the period due to non-linearity is also found. Preliminary results suggest that far from criticality there is an important contribution of the instability to the mean flow. Some applications to field and laboratory experiments are discussed.

https://doi.org/10.9753/icce.v24.%25p

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Authors retain copyright and grant the Proceedings right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this Proceedings.

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SHEAR INSTABILITY OF LONGSHORE CURRENTS: EFFECTS OF DISSIPATION AND NON-LINEARITY

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