QUANTITATIVE EVALUATION OF ENERGY DISSIPATION FUNCTION OF TRADITIONAL DRY MASONRY BED SILL BY HYDRAULIC MODEL EXPERIMENTS

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  • 水理模型実験による伝統的空石積み護床工の減勢機能の定量的評価

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<p> The purpose of this study is to quantitatively evaluate the energy dissipation function of a traditional dry masonry bed sill on the Notori River in the Akizuki district of Asakura City, Fukuoka Prefecture, using hydraulic model experiments. The experimental scale was set to 1/30 according to Froude's law of similarity. The experimental discharge was set based on the flow observation results at the time of the heavy rainfall in July 2017.3 types of hydraulic models were prepared: a traditional bed sill model and 2 general concrete bed sill models. The experimental results showed that the traditional bed sill of the Notori River has a high-velocity reduction function, and its roughness coefficient value was determined to be 0.06. The results also suggest that the bed sill can enhance the safety of the in-channel structure because the flow velocity can be kept below the design flow velocity of the dry masonry revetment.</p>

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