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Space-Time Image Analysis and Numerical Simulation of Flash Flood Caused by Torrential Rain in Urbanized Area

Author(s): I. Fujita; Y. Kunita

Linked Author(s): Ichiro FUJITA

Keywords: Flash flood; Torrential rain; Image analysis; STIV; 2D simulation; Water accident

Abstract: A flash flood occurred in the water-friendly reach of the Toga River in Kobe City in the afternoon of July 28 in 2008 and it claimed five lives including three children. The cause of the flash flood was sudden localized torrential rain concentrated on the urbanized area of the river basin. The onset of the flash flood was captured by a river monitoring camera as consecutive still images, while the surface flow just after the peak flow was videotaped by a TV cameraman without using a tripod. In order to estimate the peak discharge of the flash flood, the space-time image velocimetry (STIV) technique developed by the author was applied to the video images after applying image stabilization. The estimated discharge was used as an input parameter of the 2D numerical simulation which tries to reproduce the whole process of the flash flood.

DOI:

Year: 2011

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