側溝・用水路での水難事故の発生危険性の増大に関する実験的研究
キーワード:
drag force coefficient,
sitting position,
side ditch,
effect of backwater rise,
hydrostatic pressure,
increase of drowning accident risk
2019 年 25 巻 p. 73-78
詳細
2019 年 25 巻 p. 73-78
Due to the torrential rain, drowning accident of a small child frequently occurs in a side ditch and narrow irrigation channel. Therefore, it is very important to study the hydraulic force on the human body there. In this study, the flume experiment was conducted using a model of the human body (1/4 scale). The drag force exerted on the small child body was measured in a narrow channel. The experiment data showed that the drag force exerted on the body in the narrow channel is 2-3 times larger than that in the wide channel. Also, the buoyancy force acting on the body increases due to the backwater rise and the hydrostatic pressure is exerted on the body. Consequently, the drowning accident risk increases even in a low velocity condition.
