学会誌「自然災害科学」

2種類の風資料によるわが国沿岸での波浪の長期推算結果の比較

Comparison of Long Term Waves Hindcasted Using Two Kinds of Wind Data Sets at Coastal Sea Areas around Japan

畑田 佳男*・山口 正隆*・大福 学*・松木 太郎**・野中 浩一***

Yoshio HATADA*, Masataka YAMAGUCHI*, Manabu OHFUKU*, Taro MATSUGI** and Hirokazu NONAKA***

Abstract

Wave hindcastings for a period of 13 years at 25 observation stations along the Japan Sea coast and those for a period of 9 years at 29 observation stations along the Japanese coasts of the Pacific Ocean and the East China Sea were conducted every 1 hour by using a backward ray tracing shallow water wave model on a nesting grid with high topographical resolution. Input wind data were made in two ways. One was to recompile them from the analysis data sets provided by the European Centre for Medium range Weather Forecasts (ECMWF) and the other was to compute them by applying the Bijvoet wind model to sea-level pressure distribution which is spatially interpolated from sea-level pressure data at many locations. Comparisons are made among wave climate parameters and error statistics estimated from hindcasts and observations on various time scales such as each month and a whole year period. The main conclusion is that wave hindcasts with the ECMWF wind data give rise to a better estimate for wave climate statistics than that with the wind data by the Bijvoet model, particularly at the Japanese coasts of the Pacific Ocean.

キーワード:

Key words: