Abstract: This paper discusses in detail the estimation of sea wave spectrum by Fast Fourier Transform (FFT) method. It was calculated with FFT FORTRAN program on computer 441B-Ⅲ. The present paper deals with the following Problems:1. Collecting the wave records and analysising the Probabilistic Properties about x,D,σ,C_vC_s,C_e;2. Giving the test method of wave surface distribution and wave height distribution by C_s、C_e method and Colmogolof method respectively;3. Calculating the sea wave spectrum and Fourier Coefficient C_r acording to a series of equi-spaced data;4. Smoothing the sea wave spectrum by window function and estimating the confidence interval of the wave spectrum;5. Calculating wave properties from wave spectrum:H,T,ε. Finally, I present the formula of non-dimension sea wave speetrum and its values of parameters, and others.

摘要： 本文详细地讨论了用快速傅里叶变换法进行海浪谱的估计,它是由441B-Ⅲ型电子计算机FFT FORTRAN程序算出的。本文讨论了下述问题:1.收集波浪资料和分析概率特征:x,D,σ,C_v,C_s,C_e;2.给出波面分布和波高分布的检验法,C_s、C_e法和Colmoglog法;3.由一系列等间距资料,计算海浪谱和傅氏系数C_r;4.用窗函数平滑海浪谱,和估计谱的置信区间;5.由海浪谱计算海浪特性:H,T,ε。最后,提出无因次海浪谱的公式及其参数等。