数値モデルを用いた開水路チェックゲートの機能評価 : そのI:間接型フロート式上流水位一定ゲートの場合

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Float-operated water level control gates in direct level action (say, Neyrtec-design gates) are successfully used as hydro-mechanically controlled cross regulators in many canal systems in the world. The Japanese experiences learned from their use in the Aichi Water Supply System and the Toyogawa Water Supply System, however, show that a series of the gates in direct level action on relatively short successive reaches of the canal with the bed slope of 1/2000 to 1/5000 often creates interference water surface oscillations which result in high frequency hunting, and the gate located closely upstream of a siphon conduit is prone to be unstably controlled depending on the flow in the conduit. In this paper, as the alternative to the conventional Neyrtec-design gates, use of the particularly designed gate that may successfully be controlled in difficult conditions encountered in Japan is proposed. The float that is installed in an off-canal chamber automatically operates the upstream level control gate in the manner of indirect level action. Performance and validity of the gate in the Aichi Water Supply System are evaluated by the numerical investigations together with the in-situ hydraulic tests. The results show that the off-canal float could stably operate the gate to implement constant upstream water level control, confining upstream water level fluctuations within a desired range. In addition, it is demonstrated that the numerical model in which mechanical action of the gate is also incorporated is capable of successfully reproducing the canal flow and the gate action.
日本雨水資源化システム学会の論文

数値モデルを用いた開水路チェックゲートの機能評価 : そのI:間接型フロート式上流水位一定ゲートの場合

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