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• W2150549400 abstract "[1] Waves breaking in the shallow surf zone near the shoreline inject turbulence into the water column that may reach the bed to suspend sediment. Breaking-wave turbulence in the surf zone is, however, poorly understood, which is one of the reasons why many process-based coastal-evolution models predict coastal change during severe storms inadequately. Here, we use data collected in two natural surf zones to derive a new parameterization for the stability functionCμ that determines the magnitude of the eddy viscosity νtin two-equation turbulent-viscosity models,νt = Cμk2/e, where k is turbulent kinetic energy and e is the turbulence dissipation rate. In both data sets, the ratio of turbulence production to dissipation is small (≈0.15), while vertical turbulence diffusion is significant. This differs from assumptions underlying existing Cμ parameterizations, which we show to severely overpredict observed Cμ for most conditions. Additionally, we rewrite our new Cμparameterization into a formulation that accurately reproduces our Reynolds-stress based estimates of turbulence production. This formulation is linear with strain, consistent with earlier theoritical work for large strain rates. Also, it does not depend oneand can, therefore, also be applied in one-equation turbulent-viscosity models. We anticipate our work to improve turbulence modeling in natural surf zones and to eventually lead to more reliable predictions of coastal evolution in response to severe storms." @default.
• W2150549400 created "2016-06-24" @default.
• W2150549400 creator A5055462295 @default.
• W2150549400 creator A5062585581 @default.
• W2150549400 date "2012-12-04" @default.
• W2150549400 modified "2023-10-03" @default.
• W2150549400 title "Turbulent viscosity in natural surf zones" @default.
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• W2150549400 doi "https://doi.org/10.1029/2012gl054135" @default.
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