大阪における安政南海道津波の復元(2)-津波の伝播・氾濫特性について-

Abstract

The main objective of this study is to recreate a flood disaster in Osaka due tothe Ansei Nankaido tsunami on December 24, 1854. In the previous paper, the in-undation heights of the tsunami were estimated to be about 1.9 m through the anal-ysis based on various data of the disaster. Through numerical simulation, the spa-tial distribution of the tsunami height around the Kii strait is in fairly good agree-ment with the data of inundation heights. At Tenpozan in Osaka, the tsunamiheight was 1.89 m, therefore, close agreement between calculated and observed valueswas obtained. Moreover, the estimated flooded area also agreed with that drawed inOsaka Otsurozu which is an old illustration of the flood. The velocity and depth ofthe flooding are enough large to make about one thousand people drown and a lotof ships overturned. Synthesized results showed that the tsunami disaster can wellbe recreated with numerical simulation of the tsunami and data analysis of the oldillustration and documents of the tsunami disasters.