Wave–Current Interaction: A 2DH Model for Turbulent Jet and Bottom-Friction Dissipation

A correct representation of the non-linear interactions between waves and currents is one of the key points when studying the morphological evolution of nearshore environments, in particular close to river mouths or tidal inlets. Undoubtedly, the numerical modelling of similar phenomena can be very...

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Bibliographic Details
Published in:Water (Basel) 2018-04, Vol.10 (4), p.392
Main Authors: Pascolo, Sara, Petti, Marco, Bosa, Silvia
Format: Article
Language:English
Subjects:
Analysis
Computational fluid dynamics
Dissipation
Fluid dynamics
Fluid flow
Fluid mechanics
Frontal waves
Hydrodynamics
Inlets
Mathematical models
Rivers
Shallow water equations
Shear stress
Tidal inlets
Turbulence
Turbulent flow
Turbulent jets
Wave action
Wave propagation
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Summary:A correct representation of the non-linear interactions between waves and currents is one of the key points when studying the morphological evolution of nearshore environments, in particular close to river mouths or tidal inlets. Undoubtedly, the numerical modelling of similar phenomena can be very complex and computationally demanding, given the size of the domains. In the present paper, a two-dimensional horizontal (2DH) numerical model is applied to investigate the hydrodynamics of a turbulent jet current interacting with frontal waves, preparatory to the study of morphodynamical processes. The purpose is to reproduce accurately the turbulence of the current flow, which develops in both vertical and horizontal planes, even with the simplifications of depth-averaged velocities. Moreover, the bottom shear stress induces a mechanism of dissipation, which acts both on the jet hydrodynamics and on the wave field. Significant attention is given to this process, which turns out to be crucial in shallow waters. The present model, based on classic shallow-water equations and wave action balance, is applied to a literature test. Comparisons with theoretical and numerical outcomes are shown, the latter obtained with a quasi-3D model.
ISSN:2073-4441
2073-4441
DOI:10.3390/w10040392