Abstract
On September 6-7, 1898, a typhoon brought continuous torrential rain which caused floods and severe damage in the whole of Yamanashi Prefecture. In particular, a debris flow occurred at about 1:30 a.m. on September 7 at the southern foot of Yatsugadake, leaving 55 people dead and 51 injured in Yato section in Oizumi-mura. With 120 years having passed since the event, not only what was caused by the debris flow but also the disaster itself has disappeared from the memory of most local people. The author investigated newspapers published just after the disaster, and the “National Disaster Pictures” and “Storm Damage Survey Tables,” both compiled in the Meiji era and archived in the Imperial Household Agency. From these historical documents, the route of the debris flow that had caused the disaster was identified in this study. The author conducted debris flow simulation in the affected area applying Hyper KANAKO system. The results of simulation were compared with the debris flow route estimated from historical documents. It is suggested that a hazard of similar debris flow still exists in this area.
