### Abstract

We calculate the rate of ocean waves energy dissipation due to whitecapping by numerical simulation of deterministic phase resolving model for dynamics of ocean surface. Two independent numerical experiments are performed. First, we solve the 3D Hamiltonian equation that includes three- and four-wave interactions. This model is valid only for moderate values of surface steepness, μ < 0.09. Then we solve the exact Euler equation for non-stationary potential flow of an ideal fluid with a free surface in 2D geometry. We use the conformal mapping of domain filled with fluid onto the lower half-plane. This model is applicable for arbitrary high levels of steepness. The results of both experiments are close. The whitecapping is the threshold process that takes place if the average steepness μ > μ _{cr} ≃ 0.055. The rate of energy dissipation grows dramatically with increasing of steepness. Comparison of our results with dissipation functions used in the operational models of wave forecasting shows that these models overestimate the rate of wave dissipation by order of magnitude for typical values of steepness.

Original language | English (US) |
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Journal | JETP Letters |

DOIs | |

State | Published - Jan 1 2019 |

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### ASJC Scopus subject areas

- Physics and Astronomy (miscellaneous)

### Cite this

*JETP Letters*. https://doi.org/10.1134/S0021364019050035

**On Dissipation Rate of Ocean Waves due to White Capping.** / Korotkevich, A. O.; Prokofiev, A. O.; Zakharov, Vladimir E.

Research output: Contribution to journal › Article

*JETP Letters*. https://doi.org/10.1134/S0021364019050035

}

TY - JOUR

T1 - On Dissipation Rate of Ocean Waves due to White Capping

AU - Korotkevich, A. O.

AU - Prokofiev, A. O.

AU - Zakharov, Vladimir E

PY - 2019/1/1

Y1 - 2019/1/1

N2 - We calculate the rate of ocean waves energy dissipation due to whitecapping by numerical simulation of deterministic phase resolving model for dynamics of ocean surface. Two independent numerical experiments are performed. First, we solve the 3D Hamiltonian equation that includes three- and four-wave interactions. This model is valid only for moderate values of surface steepness, μ < 0.09. Then we solve the exact Euler equation for non-stationary potential flow of an ideal fluid with a free surface in 2D geometry. We use the conformal mapping of domain filled with fluid onto the lower half-plane. This model is applicable for arbitrary high levels of steepness. The results of both experiments are close. The whitecapping is the threshold process that takes place if the average steepness μ > μ cr ≃ 0.055. The rate of energy dissipation grows dramatically with increasing of steepness. Comparison of our results with dissipation functions used in the operational models of wave forecasting shows that these models overestimate the rate of wave dissipation by order of magnitude for typical values of steepness.

AB - We calculate the rate of ocean waves energy dissipation due to whitecapping by numerical simulation of deterministic phase resolving model for dynamics of ocean surface. Two independent numerical experiments are performed. First, we solve the 3D Hamiltonian equation that includes three- and four-wave interactions. This model is valid only for moderate values of surface steepness, μ < 0.09. Then we solve the exact Euler equation for non-stationary potential flow of an ideal fluid with a free surface in 2D geometry. We use the conformal mapping of domain filled with fluid onto the lower half-plane. This model is applicable for arbitrary high levels of steepness. The results of both experiments are close. The whitecapping is the threshold process that takes place if the average steepness μ > μ cr ≃ 0.055. The rate of energy dissipation grows dramatically with increasing of steepness. Comparison of our results with dissipation functions used in the operational models of wave forecasting shows that these models overestimate the rate of wave dissipation by order of magnitude for typical values of steepness.

UR - http://www.scopus.com/inward/record.url?scp=85062638479&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85062638479&partnerID=8YFLogxK

U2 - 10.1134/S0021364019050035

DO - 10.1134/S0021364019050035

M3 - Article

AN - SCOPUS:85062638479

JO - JETP Letters

JF - JETP Letters

SN - 0021-3640

ER -