THEREE-DIMENSIONAL PARAMETRIC MODEL FOR SANDBAR MIGRATION ON THE CHIRIHAMA AND TAKAMATSU COAST, ISHIKAWA, JAPAN

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  • 千里浜海岸周辺の多段砂州システムの組織的移動に伴う3次元地形の時空間変動に対する経験モデルの構築
  • センリハマ カイガン シュウヘン ノ タダン サス システム ノ ソシキテキ イドウ ニ トモナウ 3ジゲン チケイ ノ ジクウカン ヘンドウ ニ タイスル ケイケン モデル ノ コウチク

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 A three-dimensional parametric model was developed for the systematic migration of multiple sandbars on the Chirihama and Takamatsu Coast, Ishikawa, Japan. First, the principal modes of bar migration were extracted by an EOF analysis for the annual surveys over 11 years, and were approximated by a combimnation of simple functions for each survey line. Next, the alongshore variation of parameters in phase and amplitude variations were modeled by regression analysis. A three-dimensional parametric model was then established by synthesis of the approximate functions governing the cross-shore and alongshore variations. The comparison with field measurement demonstrated that the model is able to reproduce the main characteristics of the three-dimensional configuration and the spatio-temporal transition of the multiple sandbar systems. An ergodic feature is observed between the temporal and alongshore variation in mulitiple bar configuration.

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