Estimation of sea surface drag coefficient under strong wind condition based on the wave data

点击翻译按钮获取中文摘要

The sea surface drag coefficient, an important parameter of the energy transfer from winds to waves in wave prediction model, is generally described as a linear function of wind speed. However, it might be inadequate to apply their extrapolation to strong wind conditions. For the purpose of clarifying the appropriate values of the sea surface drag coefficient in high wind speed, the ADWAM was modified to estimate the sea surface drag coefficients as its control variables from observational wave data. As a result, I confirm that the sea surface drag coefficient was automatically corrected to appropriate values (similar to Mitsuyasu & Honda's equation in wind speed less than 30m/s) with the method although arbitrary initial values of the sea surface drag coefficient were used for the estimations. It was also confirmed that the possibility of the estimation of the sea surface drag coefficient under stormy conditions on the basis of the wave data remotely observed from storms.