Laboratory measurements of an equilibrium-range constant for wind waves at extremely high wind speeds
| Autor: | Keita Takane, Naohisa Takagaki, Hiroshige Kumamaru, Satoru Komori, Naoya Suzuki |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Atmospheric Science 010504 meteorology & atmospheric sciences 010505 oceanography Geology Mechanics Oceanography 01 natural sciences Wind speed Generator (circuit theory) Wavelength Wind wave Range (statistics) Shear velocity Computers in Earth Sciences Phase velocity Constant (mathematics) Physics::Atmospheric and Oceanic Physics 0105 earth and related environmental sciences |
| Zdroj: | Dynamics of Atmospheres and Oceans. 84:22-32 |
| ISSN: | 0377-0265 |
| Popis: | When improving wave models, it is important to determine the equilibrium-range constant for the wind-wave spectrum and find the dominant velocity parameter that well represents the equilibrium-range constant both at normal and extremely high wind speeds. Eight dominant velocity parameters were evaluated using laboratory experiments in two wind-wave tanks. One tank, installed at Kyoto University, is used for generating mechanically-generated large wind-waves. This tank has a maximum 10-m wind speed (U10) of 67 m/s and is equipped with a programmable irregular wave generator for the loop-type wave-generation method, which was originally developed in our previous study. The other tank, installed at Kyusyu University, is used for generating pure large wind-waves, and has a total length of 54 m. The results show that at extremely high wind speeds the equilibrium-range constants for mechanically-generated large wind-waves agree with those of pure small wind-waves. In addition, comparison of the correlation coefficients of the eight dominant velocity parameters with the equilibrium-range constant reveals that three dominant velocity parameters of (u*2CP)1/3, (U102CP)1/3, and ULS/2 (u*: friction velocity; CP: phase velocity; ULS/2: wind velocity at half the height of wavelength over the ocean) well correlate with the equilibrium-range constant at both normal and extremely high wind speeds. |
| Databáze: | OpenAIRE |
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