A Problem and a Coping Method When Trying Spectral Analysis of Ocean Wave Time Series Data Using a Linear Autoregressive Model

Abstract

Abstract. A problem may arise when estimating the power spectral density function of ocean wave time series data using a linear autoregressive model. The problem is that the graph of the power spectral density function is theoretically unimodal, but the estimated graph is multimodal. This phenomenon is widely known as line splitting. In this study, the authors proposed a method to solve this problem. In this study, the effectiveness of the countermeasures was not only verified by numerical simulations, but also by using actual time series data of ocean waves measured in Tokyo Bay.