High Accuracy Tidal Current Forecasting on the Basis of Harmonic Analysis of Model Simulation in the Seto Inland Sea

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  • 瀬戸内海シミュレーションモデルの調和解析にもとづく高精度潮流予測
  • セトナイカイ シミュレーション モデル ノ チョウワ カイセキ ニ モトヅク コウセイド チョウリュウ ヨソク

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Abstract

We developed a prediction method for providing detailed tide level and tidal current information covering the whole Seto Inland Sea.<br>Simulations for 33 days on tide level and the tidal current were carried out after dividing the Seto Inland Sea into the 11 domains. Vertically integrated two-dimensional model was used for the simulation and tide level changes during the target period in the Kii Channel, Bungo Channel, and Kanmon Strait were used as boundary conditions.<br>On the bases of the simulation result, we calculated 29 harmonic constants and constructed the harmonic constant database. The M2 tide and tidal current which are predominant of the Seto Inland Sea were compared with the observation data (48 tide and 51 tidal current stations). As a result, the overall distribution tendency of the M2 tide and tidal current indicated a good reproducibility.<br>Moreover, it was shown that the estimated tidal current of 29 constituents that were acquired from harmonic analysis also reproduced local flows, such as eddies of the downward flow side of the islands, in the Kurushima Strait.<br>Furthermore, good agreements were obtained when compared the tide data of 11 tidal stations in the Seto Inland Sea and the current chart mesh data.<br>This method based on the harmonic analysis of the simulation result can predict the detailed flow of the whole Seto Inland Sea at any time, and the harmonic constant database has high practicality, resulting in a method of wide application.

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