A quasi-similarity between wind waves and solid surfaces in their roughness characteristics.

概要

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A formulation for the aerodynamic roughness length of air flow over wind waves z0=γμ∗/σp which was proposed by Toba (1979) and Toba and Koga (1986) from dimensional considerations with some data analysis, is shown to correspond with a formulation for irregular solid surfaces (z0/h) =α(h/l) 1+βwhich resulted from work by Wooding et al.(1973) and Kustas and Brutsaert (1986): u is the friction velocity, σp the spectral peak frequency of wind waves, h the mean height of the solid obstacles, l the mean distance between their crests, and α, β, and γ are constants. This correspondence is reached by the existence of a statistical 3/2-power law and an effective dispersion relationship for wind waves. Because both approaches of parameterizing zo were arrived at independently, they provide each other mutual reinforcement.
日本海洋学会の論文