Author(s): Taisuke Ishigaki; Ruiji Kawanaka; Michik Hayashi
Linked Author(s): Taisuke Ishigaki
Keywords: Flood disaster; Masonry embankment; Mitigation of inundation; Safe evacuation; Calculation of inundation
Abstract: Traditional counter measures for flood disaster mitigation are one of effective works for preserving river environment. A masonry embankment called “Iga-Bane” is discussed in this paper. This embankment built in 17th C still works for mitigating inundation damage of old village in Kameoka basin, Kyoto, Japan. The name has been derived from the name of the liege lord “Iga-no-kami” whose tenure was from 1648 to 1686. The objective of this paper is to investigate the effect of this embankment on disaster mitigation and safety evacuation by using a two dimensional shallow flow model with 5 m square mesh. Inundation depth and flow velocity were calculated in the four rainfall cases of 50mm/hr to 150mm/hr. It is found that the embankment changes flow direction of flash flood caused by heavy rainfall, and this prevents the village from inundation. It is found that the embankment mitigates inundation depth and flow velocity and that elderly female is able to evacuate safely during the flood.
Year: 2020