AN INVESTIGATION OF FLOOD DISASTER OF THE AKIYAMA RIVER CAUSED BY REIWA FIRST YEAR EAST JAPAN TYPHOON

Abstract

 Investigations of flood disaster on the Akiyama river caused by Reiwa first year east Japan typhoon was performed. The river levee failed at two sites of the Akiyama river. Both levee crevasse was occurred at just the upstreamside of the bridge. Additionally, the both levee crevasse was occurred where the river width decreases steeply. Numerical analysis based on the results of the trace investigation and the hearing survey on disaster sites adjacent to the Akiyama river. Results of the numerical analysis showed that the flood disaster on the Akiyama river was caused by the flooding within the confines of the levee in addition to the flood from the levee crevasse.