相模湾周辺海域沿岸における波高の長期変動の解析

概要

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Interannual variation of wave height and wave period and their linear trend in winter and summer are separately investigated on the coastal area around Sagami bay, the Pacific coast of Japan by analyzing wave and wind data measured over more than two decades and wave data hindcast over about five decades at several measurement stations. The main stations concerned are Hiratsuka located at the bottom of the bay and Irouzaki and Habu at the entrance. The major findings are summarized as follows; 1) Existence of a statistically significant trend in time series of wave height averaged over winter months of each year strongly depends on the discontinuous increase between 1986 and 1987. 2) Trend with a statistical significance in time series of wave height can not be detected in summer. 3)Wave height and wave period tend to become greater in both summer and winter of an El-Ni.o year. 4) Year-long wave hindcast reproduces well the measurement-based interannual variation of wave height and wave period.
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