Hydrodynamics and Turbulence Dynamics under Large-Scale Bichromatic Breaking Waves

Dominic A. van der A, Joep van der Zanden, Bjarke Eltard Larsen, Pietro Scandura, Ming Li

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Abstract

Experiments were conducted in a large-scale wave flume involving a bichromatic wave group breaking over a fixed barred beach profile. Velocity profiles were measured using optical and acoustics instrumentation at 22 cross-shore locations ranging from the shoaling zone to the inner surf zone. The measurements show that turbulence in the shoaling region is primarily bed-generated and decays almost fully within one wave cycle, in contrast, in the surf zone the breaking-generated turbulence, decays over multiple wave cycles, leading to a gradual increase and decay of Turbulent Kinetic Energy (TKE) during a wave group cycle. The measurements are compared to a two-phase RANS model based on a new stabilized k-ω turbulence closure. The model accurately predicts the water surface elevation, and outperforms standard non-stabilized model in predicting the undertow profile and TKE levels in the shoaling zone and outer surf zone.
Original languageEnglish
Publication date2019
Number of pages10
Publication statusPublished - 2019
Event6th HYDRALAB+ event - Bucharest, Romania
Duration: 21 May 201925 May 2019

Conference

Conference6th HYDRALAB+ event
CountryRomania
CityBucharest,
Period21/05/201925/05/2019

Projects

Cite this

van der A, D. A., van der Zanden, J., Larsen, B. E., Scandura, P., & Li, M. (2019). Hydrodynamics and Turbulence Dynamics under Large-Scale Bichromatic Breaking Waves. Paper presented at 6th HYDRALAB+ event, Bucharest, Romania.