Variation of M2 Tidal Amplification in the Ariake Sea based on Outer Sea Tide, and Influence of the Isahaya Sea-Dyke

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  • Tai Akira
    Department of Marine System Engineering, Kyushu University
  • Yano Shinochiro
    Department of Urban and Environmental Engineering, Kyushu University

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Other Title
  • 外海を基準とした有明海のM2潮増幅率の変動特性と諫早湾潮受け堤防建設による影響
  • ガイカイ オ キジュン ト シタ アリアケカイ ノ M2 シオ ゾウフクリツ ノ ヘンドウ トクセイ ト イサハヤワン シオウケ テイボウ ケンセツ ニ ヨル エイキョウ

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<p>The present work is intended to declare the variation of M2 tidal amplification of the inner Ariake Sea to the outer sea area by using the harmonic analysis of tidal data for the period from 1969 to 2005. Firstly, a negative Kendoll's rank correlation between the M2 tidal amplification and the M2 tidal amplitude at the outer sea is found. The amplification shows "in opposite phase" of temporal variation with the M2 tidal amplitude related to the 18.6 years lunar nodical cycle. Thus, to examine the influences of the Isahaya Sea-Dike (ISD) on the tidal amplification in the Ariake Sea, it is necessary to compare them under same conditions of the tidal amplitude. As a result of analysis considering it, we found that the M2 tidal amplification at Kuchinotsu after construction of the ISD was larger than that before it in the case of large M2 tidal amplitude. In addition, no remarkable change of the M2 tidal amplification at Ohura was found. On the other hand, in the case of small M2 tidal amplitude the M2 tidal amplification at Ohura became large and that at Kuchinotsu showed no significant change after the ISD construction. The results indicate that the influence of the ISD on the tide in the Ariake Sea shows a spatiotemporal variation.</p>

Journal

  • Oceanography in Japan

    Oceanography in Japan 17 (3), 205-211, 2008-05-01

    The Oceanographic Society of Japan

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