Rainfall effect on wind waves and the turbulence beneath air-sea interface

ZHAO Dongliang; MA Xin; LIU Bin; XIE Lian

doi:10.1007/s13131-013-0372-7

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ZHAO Dongliang, MA Xin, LIU Bin, XIE Lian. Rainfall effect on wind waves and the turbulence beneath air-sea interface[J]. Acta Oceanologica Sinica, 2013, 32(11): 10-20. doi: 10.1007/s13131-013-0372-7

Citation:

ZHAO Dongliang, MA Xin, LIU Bin, XIE Lian. Rainfall effect on wind waves and the turbulence beneath air-sea interface[J]. Acta Oceanologica Sinica, 2013, 32(11): 10-20. doi: 10.1007/s13131-013-0372-7

ZHAO Dongliang, MA Xin, LIU Bin, XIE Lian. Rainfall effect on wind waves and the turbulence beneath air-sea interface[J]. Acta Oceanologica Sinica, 2013, 32(11): 10-20. doi: 10.1007/s13131-013-0372-7

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Rainfall effect on wind waves and the turbulence beneath air-sea interface

doi: 10.1007/s13131-013-0372-7

1.
Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China
2.
Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh 27695-8208, USA

Received Date: 2012-02-13
Rev Recd Date: 2013-04-07

Abstract

Abstract

Rainfall effects on wind waves and turbulence are investigated through the laboratory experiments in a large wind-wave tank. It is found that the wind waves are damped as a whole at low wind speeds, but are enhanced at high wind speeds. This dual effect of rain on the wind waves increases with the increase of rain rate, while the influence of rainfall-area length is not observable. At the low wind speed, the corresponding turbulence in terms of the turbulent kinetic energy (TKE) dissipation rate is significantly enhanced by rainfall as the waves are damped severely. At the high wind speed, the augment of the TKE dissipation rate is suppressed while the wind waves are enhanced simultaneously. In the field, however, rainfall usually hinders the development ofwaves. In order to explain this contradiction of rainfall effect on waves, a possibility about energy transfer fromturbulence to waves in case of the spectral peak ofwaves overlapping the inertial subrange of turbulence is assumed. It can be applied to interpret the damping phenomenon of gas transfer velocity in the laboratory experiments, and the variation of the TKE dissipation rates near sea surface compared with the law of wall.
- rainfall,
- wind wave,
- wave age,
- turbulence,
- turbulent kinetic energy

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References(34)

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