Application of the Convolution Method on the Fast Prediction of the Wind-Driven Current in a Samll Bay

소규모 만에서 취송류의 신속예측을 위한 convolution 기법의 적용

  • 최석원 ;
  • 조규대 ;
  • 윤홍주
  • Published : 1999.06.01

Abstract

In order to fast predict the wind-driven current in a small bay, a convolution method in which the wind-driven current can be generated only with the local wind is developed and applied in the idealized bay and the idealized Sachon Bay. The accuracy of the convlution method is assessed through a series of the numerical experiements carried out in the jidealized bay and the idealized Sachon Bay. The optimum response function for the convolution method is obtained by minimizing the root man square (rms) difference between the current given by the numerical model and the current given by the convolution method. The north-south component of the response function shows simultaneous fluctuations in the wind and wind-driven current at marginal region while it shows "sea-saw" fluctuations (in which the wind and wind-driven current have opposite direction) at the central region in the idealized Sachon Bay. The present wind is strong enough to influence on the wind-driven current especially in the idealized Sachon Bay. The spatial average of the rms ratio defined as the ratio of the rms error to the rms speed is 0.05 in the idealized bay and 0.26 in the idealized Sachon Bay. The recover rate of kinetic energy(rrke) is 99% in the idealized bay and 94% in the idealized Sachon Bay. Thus, the predicted wind-driven current by the convolution model is in a good agreement with the computed one by the numerical model in the idealized bay and the idealized Sachon Bay.achon Bay.

Keywords

convolution method;fast prediction;idealized bay;idealized Sachon Bay;rms ratio;wind-driven current

References

  1. 한국해안·해양공학회지 v.7 표층해류 신속예측을 위한 회선적분법의 적용 강관수;정경태
  2. J. Phys. Oceanogr v.16 Winter-time winds and coastal sea-level fluctuations in the Northeast China Sea, Part II: Numerical model Hsueh, Y.;D.R. Richard;P.W. DeWitt
  3. Arch. Meteor. Geophys. Biokolim v.A19 Calculation of the steady-state wind-driven circulation in Lake Ontario Rao, D.B.;T.S. Murthy
  4. J. Oceanogr. Soc. Japan v.46 Circulation of the East China Sea: A numerical study Chao, S.Y.
  5. Circulation in the coastal ocean Csanady, G.T.
  6. J. Phys. Oceanogr. v.2 Wind-induced barotropic motions in long lakes Csanady, G.T.
  7. J. Oceanogr. Soc. Japan v.49 Seasonal variation of circulations in the East China and the Yellow Sea Yanagi, T.;S. Takahashi