Advanced Hazard Information and Methods for Appropriate Evacuation During Sediment Disasters

Kana NAKATANI, Kazuki YAMANOI, Yuji HASEGAWA, Seiya HAYASHI, Shusuke MIYATA and Masaharu FUJITA

In Japan, recent sediment disasters have resulted in substantial damage. For appropriate evacuation to minimize damage, it is necessary to provide residents with suitable hazard information on a routine basis and to develop high awareness of disaster risks. Although numerical simulations are useful tools for obtaining advanced information, the associated systems are generally developed by experts with specialized knowledge and techniques. Consequently, non-expert residents experience difficulty understanding the input conditions and output results. Furthermore, the information that local governments and communities require to develop evacuation methods might be different from that received from researchers using simulations. To avoid this conundrum, we therefore presented our simulation systems to local government engineers and discussed examples of input and output data. The important factor was the simulation accuracy and reliability for applying to evacuation. Moreover, for providing information to local residents, we confirmed that the information for both the input and output data needs to be compared with the recorded or experienced rainfall or disaster events for intuitive understanding. To utilize numerical simulations as effective information, we applied the proposed simulation system to a village in Miyazu City, Kyoto Prefecture with three scenarios considering past disaster rainfall records. For secure high accuracy and reliability to the target site, we conducted field survey and observation, and estimated some suitable parameters, then run simulations. And we presented the results of our simulations on GIS, which better helps residents to be cognizant of the disaster risks.

2018/1 327-335