多段バーの安定機構に関係する底質のサクション動態・密度・せん断強度の時空間変化

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タイトル別名
  • Spatiotemporal Variations of Suction Dynamics, Density, and Shear Strength Relating to Morphological Stability on Multiple Sand-bars
  • タダン バー ノ アンテイ キコウ ニ カンケイ スル テイシツ ノ サクション ドウタイ ・ ミツド ・ センダンキョウド ノ ジクウカン ヘンカ

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抄録

The morphology and suction dynamics of intertidal multiple sand bars is examined to provide insight into the factors controlling the bar characteristics. Field experiments over the intertidal sand waves show that the vane shear strength near sediment surface increases with suction behavior. Richards equation which expressed suction and ground water dynamics were used in numerical model. The laboratory experiment which imitates the ebb and flow upon sandy flats was used for validation of proposed model. In numerical experiment of tide-dominated conditions which mean quite small bedload effects, morphlogical changes show close relationships with suction dynamics due to suction-induced void state changes.

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