堤防自主決壊による利根川の洪水氾濫水の排水効果

抄録

When an inundation from the river occurred, appropriate evacuation, rescue, reconstruction assistance, volunteer on site and drainage of the inundated water are required to reduce the flood damage. In this paper, artificial levee break is focused as an example of such drainage measure. 5 inundation scenarios from the Tone River by Cabinet Office (2007) are referred and the drainage effect according to artificial levee break, thus it is to return the inundated water to the river channel, is examined using numerical simulation model. In lots of cases, the results show that over 70% of total inundated water volume is returned to the river and average discharge is over 100m³/s by artificial levee break. It indicates artificial levee break may be one of very effective drainage ways of the inundated water and important for risk management in the actual flood control design.