摘要:

The ability of one‐dimensional hydrodynamic models to reproduce dissipation of turbulent kinetic energy and velocity profiles for conditions of whitecapping waves in a shallow water, tide‐ and wind‐forced environment was assessed. The models were forced with the conditions experienced during a month‐long field experiment in a shallow estuarine embayment, and the results were compared with the observed dissipation and mean velocity profiles. Three turbulence models were assessed: thek‐ωmodel and twok‐lmodels, with different prescribed bilinear relationships for the turbulent length scale,l. Thek‐ωturbulence model was found to best replicate the measured decay of dissipation with depth with a surface roughness length,z0s= 1.3Hs, and wave energy parameter,α= 60. Thek‐lmodel achieved equally as good reproduction of the observations as thek‐ωmodel when the proportionality constant in the prescribed linear length scale relationship for the upper half of the water column was modified from the traditionally employed von Karman's constant, κ = 0.4, to 0.25. The model results show that the whitecapping waves often supplied the dominant source of turbulent kinetic energy over the majority of the water column in the shallow, tide

ISSN:0148-0227    

DOI:10.1029/2007JC004246

年代:2008

数据来源: WILEY