EVALUATION OF HYDRAULIC EXERTING FORCE FOR DESIGNING OF BANK PROTECTION IN RIVER BENDS

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  • 河道湾曲部の河岸保護工設計のための水理的外力評価に関する研究
  • カドウ ワンキョクブ ノ カシ ホゴコウ セッケイ ノ タメ ノ スイリテキ ガイリョク ヒョウカ ニ カンスル ケンキュウ

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In order to prepare the guide for designing rich-in-nature type of bank protection, we examined the stability of dry-laid masonry type of revetments in river bends experimentally, and investigated the flow action on the outer bank of bend using 2D numerical simulation model. It is shown that the index vtoe/vavg (vtoe the maximum depth-averaged velocity over the toe of the outer bank, vavg: the average velocity in the approach channel) is useful for evaluation of exerting force on bank, and that some kinds of parameters such as r/B (r: the radius of curvature, B: the width of river), dimensionless shear stress in the approach channel τ*0, Froude number Fr, etc. have an influence on the value of index vtoe/vavg. Finally, based on the above, we propose a method of evaluating the exerting force on bank.

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