Correlation between foam-bubble size and drag coefficient in hurricane conditions

Ephim Golbraikh; Yuri M. Shtemler

doi:10.1007/s10236-018-1166-4

Correlation between foam-bubble size and drag coefficient in hurricane conditions

Ephim Golbraikh, Yuri M. Shtemler

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

A recently proposed model of foam impact on the air–sea drag coefficient C_d has been employed for the estimation of the effective foam-bubble radius R_b variation with wind speed U₁₀ in hurricane conditions. The model relates C_d(U₁₀) with the effective roughness length Z_eff(U₁₀) represented as a sum of aerodynamic roughness lengths of the foam-free and foam-covered sea surfaces Z_w(U₁₀) and Z_f(U₁₀) weighted with the foam coverage coefficient α_f(U₁₀). This relation is treated for known phenomenological distributions C_d(U₁₀), Z_w(U₁₀), and α_f(U₁₀) at strong wind speeds as an inverse problem for the effective roughness parameter of foam-covered sea surface Z_f(U₁₀). The present study is aimed at the estimation of the effective roughness of the sea surface assuming that the measurement data for the effective drag coefficient are known. The effective foam-bubble size is found as a function of the wind speed.

Original language	English
Pages (from-to)	817-824
Number of pages	8
Journal	Ocean Dynamics
Volume	68
Issue number	7
DOIs	https://doi.org/10.1007/s10236-018-1166-4
State	Published - 1 Jul 2018

Keywords

Drag reduction
Foam
Hurricane
Ocean-atmosphere exchange

ASJC Scopus subject areas

Oceanography

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10.1007/s10236-018-1166-4

Cite this

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title = "Correlation between foam-bubble size and drag coefficient in hurricane conditions",

abstract = "A recently proposed model of foam impact on the air–sea drag coefficient Cd has been employed for the estimation of the effective foam-bubble radius Rb variation with wind speed U10 in hurricane conditions. The model relates Cd(U10) with the effective roughness length Zeff(U10) represented as a sum of aerodynamic roughness lengths of the foam-free and foam-covered sea surfaces Zw(U10) and Zf(U10) weighted with the foam coverage coefficient αf(U10). This relation is treated for known phenomenological distributions Cd(U10), Zw(U10), and αf(U10) at strong wind speeds as an inverse problem for the effective roughness parameter of foam-covered sea surface Zf(U10). The present study is aimed at the estimation of the effective roughness of the sea surface assuming that the measurement data for the effective drag coefficient are known. The effective foam-bubble size is found as a function of the wind speed.",

keywords = "Drag reduction, Foam, Hurricane, Ocean-atmosphere exchange",

author = "Ephim Golbraikh and Shtemler, {Yuri M.}",

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AU - Shtemler, Yuri M.

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N2 - A recently proposed model of foam impact on the air–sea drag coefficient Cd has been employed for the estimation of the effective foam-bubble radius Rb variation with wind speed U10 in hurricane conditions. The model relates Cd(U10) with the effective roughness length Zeff(U10) represented as a sum of aerodynamic roughness lengths of the foam-free and foam-covered sea surfaces Zw(U10) and Zf(U10) weighted with the foam coverage coefficient αf(U10). This relation is treated for known phenomenological distributions Cd(U10), Zw(U10), and αf(U10) at strong wind speeds as an inverse problem for the effective roughness parameter of foam-covered sea surface Zf(U10). The present study is aimed at the estimation of the effective roughness of the sea surface assuming that the measurement data for the effective drag coefficient are known. The effective foam-bubble size is found as a function of the wind speed.

AB - A recently proposed model of foam impact on the air–sea drag coefficient Cd has been employed for the estimation of the effective foam-bubble radius Rb variation with wind speed U10 in hurricane conditions. The model relates Cd(U10) with the effective roughness length Zeff(U10) represented as a sum of aerodynamic roughness lengths of the foam-free and foam-covered sea surfaces Zw(U10) and Zf(U10) weighted with the foam coverage coefficient αf(U10). This relation is treated for known phenomenological distributions Cd(U10), Zw(U10), and αf(U10) at strong wind speeds as an inverse problem for the effective roughness parameter of foam-covered sea surface Zf(U10). The present study is aimed at the estimation of the effective roughness of the sea surface assuming that the measurement data for the effective drag coefficient are known. The effective foam-bubble size is found as a function of the wind speed.

KW - Drag reduction

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KW - Ocean-atmosphere exchange

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Correlation between foam-bubble size and drag coefficient in hurricane conditions

Abstract

Keywords

ASJC Scopus subject areas

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