where j=l, 2, 3. 4; k=1, 2, 3: R₁=U₁₀/β_*; β_*=C_p/u_*; R₂=U₁₀/β; β=C/U₁₀; R₃=H_s*U₁₀; a_jk, b_jk, and c_jk are empirical coefficients changing with atmospheric stability parameter, TV (=[(T₁₀-T_n)/U₁₀²]×10²); U₁₀ and T₁₀ are the wind speed (m/s) and air temperature (°C) at a height 10m above mean sea level, respectively; u_* is the friction velocity (m/s) of air; T_w is the surface layer temperature (°C); C_p is the phase speed (m/s) of waves of the spectral peak. Physical quantities and numerical values related to equation (26) are listed in Table 1.

The wave age or the wave height being certain magnitude given, only the wind speed is left as a variable in the equation (26) there by reduced it to a nonlinear equation: C_Djk=a_jk'+b_jk'*U₁₀+c_jk' *U₁₀², where a_jk', b_jk' and c_jk' are three empirical coefficients.

So far as the cases examined are concerned, the results obtained from the equation (26) have been compared with the practical observations, and better accordance has been achieved than those given by the forerunner’ s formulas.