Scaling surf zone turbulence
نویسنده
چکیده
[1] Turbulence in the surf zone, the shallow region adjacent to the shoreline, has a key role in beach erosion, fertilization, dispersal, and larval settlement of marine invertebrates, and microbial contamination dilution in beach waters. Breakingwave generated (the dominant source) surf zone turbulence is understood poorly. A new surf zone turbulent dissipation rate scaling is derived, that collapses new field surf zone observations with relatively high skill compared to other scalings. The vertically-uniform length-scale is 1/6 the water depth, and 15% of the wave-energy flux gradient is dissipated below the mean surface. Field and laboratory surf zone turbulence observations are shown to be consistent using the scaling. The non-dimensional surf zone diffusivity and suspended sediment profile can be applied to sediment transport and a range of biological processes including microbial pathogen contamination of beach waters. Citation: Feddersen, F. (2012), Scaling surf zone turbulence, Geophys. Res. Lett., 39, L18613, doi:10.1029/2012GL052970.
منابع مشابه
Modelling Vertical Variation of Turbulent Flow across a Surf Zone Using Swash
This paper presents the application of the open source non-hydrostatic wave-flow model SWASH to propagation of irregular waves in a barred surf zone, and the model results are discussed by comparing against an extensive laboratory data set. This study focus not only on wave transformation in the surf zone, but also on the numerical prediction of undertow and vertical distribution of turbulence ...
متن کاملEvaluation of turbulence closure models under spilling and plunging breakers in the surf zone
Turbulence closure models are evaluated for application to spilling and plunging breakers in the surf zone using open source computational fluid dynamics software. A new library of turbulence models for application to multiphase flows has been developed and is assessed for numerical efficiency and accuracy by comparing against existing laboratory data for surface elevation, velocity and turbule...
متن کاملParameterization of Time-Averaged Suspended Sediment Concentration in the Nearshore
To quantify the effect of wave breaking turbulence on sediment transport in the nearshore, the vertical distribution of time-averaged suspended sediment concentration (SSC) in the surf zone was parameterized in terms of the turbulent kinetic energy (TKE) at different cross-shore locations, including the bar crest, bar trough, and inner surf zone. Using data from a large-scale laboratory experim...
متن کاملRotational surf zone modeling for Oðl4Þ Boussinesq–Green–Naghdi systems
A surf zone model is developed and tested based on the Oðl4Þ Boussinesq–Green–Naghdi system of Zhang et al. (2013). Because the model is fundamentally rotational, it uses fewer ad hoc assumptions than are found in many Boussinesq breaking wave systems. Eddy viscosity is used to describe both breaking dissipation and bottom friction, with breaking viscosities derived from the turbulent kinetic e...
متن کاملModeling coastal aerosol transport and effects of surf-produced aerosols on processes in the marine atmospheric boundary layer
The Coastal Aerosol Transport (CAT) model was developed to study the evolution of aerosol particle size distributions and composition in the coastal environment. The model simulates such processes as particle production at the sea surface, mixing of particles through the boundary layer by turbulent diffusion, gravitational settling, and dry deposition. The model is initialized at the shoreline ...
متن کامل