A Study of Vulnerability of Emergency Transportation Road Considering the Complex Disasters

Abstract eng:
Japanese local government has designated expressway, national highway, highway and road which mutually linked these one and disaster prevention facilities as Emergency Transportation Road, to carry out the emergency transportation which occurs immediately after an earthquake hits, based on the Great Hanshin/Awaji Earthquake in 1995. Emergency transportation was carried out not only when the earthquake has occurred but when the various disaster has occurred. Therefore, in high disaster risk countries like japan, the role to be played by the Emergency Transportation Road is very important. However, Emergency Transportation Road was only evaluated and designated aforementioned connectivity, disaster potential of Emergency Transportation Road was not taken into consideration. Furthermore, disaster potential of Emergency Transportation Road was not sufficiently considered. Therefore, existing emergency transportation plan that utilizes Emergency Transportation Road is supposed that cannot function as sufficient plan. It is necessary to make clear that disaster potential of Emergency Transportation Road, and need consideration whether emergency transportation is possible or impossible in view of like that the disaster potential. The present study discusses as follows: to evaluate the disaster potential of Emergency Transportation Road, to conduct an analysis of emergency transportation from each prefectural to municipal offices and evacuation facilities. With respect to disaster potential of Emergency Transportation Road, this paper provides an analysis of three types of disaster as shown below: first, road blockage caused by the building collapse due to an earthquake, second, inundation damage caused by river flooding owing to rainfall, finally, road blockage caused by sediment disaster. Divide these disaster into two cases, one is these disaster occurs alone, the other is these disaster generated in complex. In each case conduct an analysis of connectivity of Emergency Transportation Road network by simulation which used random number, and emergency transportation from each prefectural to evacuation facilities is considered. As a result of this study, it became clear that Emergency Transportation Road has high disaster potential. Therefore, it became clear that there is a possibility that emergency transport utilized Emergency Transportation Road network is difficult.

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