取水堰の操作が河川の水面形と下流部の流況に及ぼす影響評価
キーワード:
Unsteady flow,
Head works,
Surface water track,
Flood control,
Gate opening,
River administration
2015 年 21 巻 1 号 p. 29-35
詳細
2015 年 21 巻 1 号 p. 29-35
Prompt gate control of diversion weirs is required to flow the excess water under the flood condition. It is also important for gate opening method of diversion weir to ensure safety and simplicity to prevent the water accidents and human errors. The aim of this study is to develop the optimal method of gate opening method of diversion weir under the flood condition. A simulation model describing one dimensional unsteady flow was introduced to evaluate the effect of the gate opening of multiple diversion weirs on the downstream current. Using this model, the surface water profile was estimated under the different patterns of gate opening procedure. The simulateds result indicated that the fluctuation of water level and extent of impact by gate opening varied with the speed of the gate opening. The appropriate speed of the gate opening was clarified to reduce the fluctuation of water level by gate opening under the flood condition. The method introduced in this study is effective to develop the optimal gate control method of the diversion weirs for not only prompt flood protection but also safety.
