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海浪谱是描述海浪现象的主要手段之一。通过对实测谱的研究,分析海浪的生成机制及发展、消衰过程,揭示海浪内部结构和对外表现的统计特征之间的关系。这对于海洋环境研究、海浪预报及海洋工程设计都是很有意义的。过去,由于观测资料所限,对南海中部的海浪谱研究甚少。为此,我们利用1983年9月至1985年1月间南海中部四个航次的120份海浪连续记录进行波谱分析。通过无因次化手段,拟合出一个以平均波高H和平均周期T为参量的单峰海浪谱。拟合谱的形式为幂指函数。经与本海区及南海北部海区的实测谱比较表明,本文的拟合谱在南海具有一定的代表性。
Wave spectrum is one of the main means to describe the phenomenon of waves. Through the study of the measured spectrum, the paper analyzes the mechanism of ocean wave formation and development, the process of decay, and reveals the relationship between the internal structure of the ocean wave and the statistical characteristics of external manifestations. This is of great interest to the marine environment research, ocean wave forecasting and marine engineering design. In the past, due to limited observation data, little research has been done on the sea waves in the central South China Sea. For this purpose, we used the continuous record of 120 ocean waves recorded at four voyages of the South China Sea from September 1983 to January 1985 for spectral analysis. Through the dimensionless method, a unimodal sea wave spectrum with the average wave height H and the average period T as the parameters is fitted. The form of the fitted spectrum is a power-finger function. The comparison with the measured data of the sea area and the northern South China Sea shows that the fitting spectrum of this paper is representative in the South China Sea.