2種類の長期波浪推算資料の韓国沿岸での精度検証  [in Japanese] VERIFYING ACCURACY OF TWO TYPES OF LONG-YEAR WAVE HINDCASTING DATA SAMPLES AT EACH OF THE ONSHORE STATIONS ALONG THE KOREAN COASTS  [in Japanese]

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Abstract

高い時空間解像度をもつ気象庁MSM風資料を入力海上風分布とした高地形解像度条件での第一世代1点浅海モデル(BRTM)および中規模地形解像度条件での第三世代モデルSWAN(Version40.91ABC)による長期波浪推算システムをそれぞれ韓国沿岸18地点別ならびに北西太平洋領域での13年間にわたる波浪推算に適用し,上記の地点に加えて後者ではわが国太平洋岸12地点の観測値との比較から精度を調べて,つぎの成果を得た.1) BRTMは韓国沿岸の全域に分布する観測地点の波高・周期に対して良好な再現性を示す.2) SWANは韓国沿岸地点のみならずわが国太平洋岸地点において波高に対して観測結果より高めの値を,周期に対して低めの値を生じる傾向にある.前者は地形解像度の不足,後者は減衰項などの定式化の問題に起因すると考えられる.

 Two types of 13-year-long wave hindcasting data samples in cases where the input wind conditions are taken from the MSM(Meso Scale Model)-based wind data sets provided by JMA(Japan Meteorological Agency) are compared with the measurement data for significant wave heights and wave periods at each of 18 onshore stations deployed along the entire Korean coast. One type of the hindcasting data set is individually obtained at each of the Korean coastal stations by using a backward ray tracing model(BRTM)associated with a high resolution nesting grid put on the Northwestern Pacific Ocean. The other type of wave data set on the entire region is made by SWAN(Version40.91ABC) with a medium-size space resolution grid put on the Northwestern Pacific Ocean. The SWAN-based data is also compared with the measurement data at each of 12 NOWPHAS stations situated along the Japanese Pacific coast. The following results are found: 1) at any of the Korean coastal stations, BRTM yields reasonable estimates; 2) at most stations of not only the Korean coast but also the Japanese Pacific coast, SWAN tends to give an overestimation for wave heights, perhaps due to use of a poorer space resolution grid, and tends to yield an underestimation for wave periods, possibly due to an unsatisfactory formulation of the source term such as the energy dissipation term in the SWAN.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 74(2), I_599-I_604, 2018

    Japan Society of Civil Engineers

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