用实测波浪数据确定JONSWAP谱参数

ESTIMATION OF PARAMETERS IN JONSWAP SPECTRUM WITH MEASURED WAVE DATA

本文给出应用实测波浪数据确定JONSWAP谱参数的方法.若Hs.Tz,Tc分别为实测的有效波高,平均上跨零线周期,平均峰—峰周期并令y=Tz/Tc本,本文导出求解谱参数γ值的方程f(γ,y)=0.根据这个方程的解并应用最小二乘法,γ作为y的函数的表达式可写为(对于2.54≤γ≤15.34及16≤y≤1.79) γ=5546.721-9586.533y+5568.168y^2-1089y^3+2y^4当γ确定后JONSWAP谱其余参数亦可获得.另外,本文还给出应用Hs,Tz,ω_0或Hs,Tz,S(ω_0)来确定JONSWAP谱参数的方法.

The method of determining JONSWAP spectrum by using measured wave data is presented. Assuming Hs, Tz and Tc are the measured significant wave height, average zero-up crossing wave period and average period, respectively, between wave crests and letting Tz/Tc= y, an equation is provided to solve γ from f (γ, y) = 0. From the solutions of the equation and by using LSM, the expression relating γ as a function of y may be written as γ=5546. 721 -9586. 533y + 5568. 168y2 -1089y3 + 2y4, for 2. 54≤γ≤15. 34 and 1. 6≤y≤l. 79- When γ is know, the rest of parameters in JONSWAP spectrum can be obtained. In addition , alternatives for determining JONSWAP spectral parameters by using Hs, Tz, ω0, or Hs, Tz, 5 (ω0) are also provided.