SummaryDisaster mitigation management is considered a very important aspect in marine catastrophes, such as a tsunami, especially because drifting ships containing passengers and hazardous substances can cause a huge disaster in a port. It has already been analyzed that at the arrival of a tsunami, it is very hazardous for a large passenger vessel to evacuate passengers first. In this study, the assessment of evacuation at Osaka Bay in Japan is based on Automatic Identification System (AIS) data used as input for a Discrete Event Simulation (DES), which assesses ship evacuation time and using the Geographic Information System (GIS) to determine the locus of ships. The location of ship evacuation is decided in the anchorage area since the time needed for a ship to evacuate outside Osaka Bay is more than the predicted time of a tsunami arrival. In this paper, a preliminary proposed safe area for evacuation is evaluated and the possibility of large passenger vessel evacuation is shown.

No abstract

A research of how to use disaster information by local governments for heavy rainfall.USH1YAMA Motoyuki, IMA1VIURA Furnihiko, KATADA Toshitaka, KOSHIMURA SyunichiThe purpose of this paper is an investigation of how to collect and use heavy rainfall disaster information by local governments. Questionnaire data were gathered from 230 municipalities within Iwate, Miyagi, Fukushima, Gifu, and Mie prefectures. They were struck by typhoon No.0206 in July 2002. 32 municipalities issued evacuation counsel for disaster. A half of it answered that the decisive factor of evacuation counsel was occurrence of damage. The result indicated that it was difficult to issue evacuation counsel in advance of damage. Respondenfs ratios of rainfall information received on real time were as follows: The rainfall data by Meteorological Agency (JMA) was 92 percent, the rainfall and water revel data by Ministry of Land, Infrastructure and Transportation (MLIT) was 72 percent, the rainfall and water revel data by prefecture was 78 percent Respondent's ratios of actually used information were as follows: The data of JMA was 74 percent, the data of MLIT was 38 percent, the data of prefecture was 51 percent It is necessary that the information of JMA and other information is unified. 58 percent municipalities had own raingauge on their office and 87 percent of raingauge data were used in this event .Self-administrated raingauge was relied. Flood hazard maps were made in 10 percent of municipalities. But municipalities of actually used hazard map in this event were a half of those. It is important that practicality of hazard map was verified.

No abstract

NAMIKAWAIn this study, run-up tsunami simulation with high-resolution topographic model is applied for design of tsunami countermeasure such as sea wall and breakwater in the case of coastal area in Sanriku. The topographic model of 10m grid DEM (Digital Elevation Model) is made by LiDAR (Light Detection and Ranging) data. The resolution of the altitude of LiDAR data is 15 cm. The behaviors of tsunami on the land with three plans of the countermeasure in the coast are carried out using tsunami simulation and compared. The effect to reduce the inundation area and damage, and the coast to construct them for each plan are discussed.