EGU General Assembly 2020
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Observational evidence of surface wave-generated strong ocean turbulence

Hongyu Ma, Dejun Dai, Jingsong Guo, and Fangli Qiao
Hongyu Ma et al.
  • First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China

By using an Acoustic Doppler Velocimeter (ADV) mounted on the seabed of the continental shelf of the northern South China Sea, high frequency velocity fluctuations were measured for 4.5 days. The turbulent kinetic energy dissipation rate was estimated. During the observation, the strong ocean response to Typhoon Rammasun was recorded to compare the turbulent characteristics before and during the typhoon. The results show that the turbulence near the seabed is mainly generated by the tidal current shear and exhibits a quarter diurnal variation during the period before the typhoon. During the typhoon period, the dissipation rate dramatically increased from 1×10-6 m2 s-3 to 1×10-2 m2 s-3 within a short time, and the significant wave height and the surface wave orbital velocity showed the same tendency. This finding suggests that the turbulence is dominantly generated by the surface waves near the seabed.

How to cite: Ma, H., Dai, D., Guo, J., and Qiao, F.: Observational evidence of surface wave-generated strong ocean turbulence, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-3207,, 2020.