2019 Volume 75 Issue 1 Pages 17-25
Short-time heavy rainfall events have increased in Japan. The rainfall events cause flush floods in urban area and the flooded cars expanded the human damages (Nagasaki in 1982). Therefore, it is very important to investigate the flood-flow charastistics and floating behavior of cars on flooded roads. In this study, three kinds of hydraulic model experiments were conducted using model car (Sedan type). First, we measured the flood-flow velocity in underground parking model (1/64 scale). Then, we recorded the floating behavior of the flooded car. Finally, we measured the time series of the drag force exerted on the model cars (1/64 scale) in unsteady flow by using Force gage. The results revealed that the drag force increases rapidly during an early stage becase of the hydrostatic pressure difference.
