香港附近海区台风海浪谱研究

A STUDY ON TYPHOON WAVE SPECTRUM IN THE SEA AREA ADJACENT HONG KONG

据1985年Tess台风影响下香港附近西冲测站59组实测海浪谱,应用JONSWAP谱型反复对实测的无因次平均谱拟合与比较,提出了一个台风海浪无因次拟合谱。将此无因次拟合谱与1986年Wayne台风37组实测无因次平均谱拟合比较,两者十分相近。将此转化为以,和ω_0为参量的有因次谱,幂指数P是的函数,ω_0则是,的函数。该有因次谱与三个台风海浪谱拟合,效果良好,可以代表香港附近海区的海浪谱。离差指标检验与谱形、波参数比较,都较为理想。文中还探讨了深水台风海浪谱公式。

According to 59 groups of measured wave spectra which were taken at Xichong Station adjacent to Hong Kong under the influence of Typhoon Tess in 1985, and by application of JONSWAP spectrum form , repeated fitting and comparison on the measured non-dimensional mean spectrum, a non-dimensional fitted spectrum for typhoon wave was advanced. Through fitting and comparisons between this non-dimensional fitted spectrum to the mean spectrum of 37 groups measured waves from Typhoon Wayne in 1986, the two spectrum forms were extreemely similar. These were transformed into a dimensional spectrum with H , T and ω0 as parameters, where power index of the spectrum formula was the function of H,and ω0 the function of T , H. This dimensional spectrum was fitted with the wave spectra of 3 typhoons , obtaining good results, and might represent the wave spectrum for the sea area adjacent to Hong Kong. The examination of the deviation index and the comparisons of spectrum shape and wave parameters of the fitted spectrum to the measured spectrum were all fairly ideal . This paper also inquires into the formula of typhoon wave spectrum for deep waters.