洪水氾濫流が都市ガス供給システムに及ぼす影響の試算手法を用いた被害想定の考察

抄録

Urban utility gas systems composed of ground facilities such as microcomputer gas meters and gas governors, and buried pipeline networks, which have been widely installed in urban lowland areas. Although these gas systems often have been suffered from river flood inundations, there have been a few conventional works which describe causes and effects of the utility gas outages due to the inundations. The present study proposes the methods to estimate and to integrate such of the utility gas damages as ground facility submersions due to the river floods with levee breaches. We quantitatively evaluate the outage durations in utility gas distribution systems by considering the post-flooding restoration works such as drainage of the inundation water with pumping stations and repairing and exchanging the facilities of gas utility systems. Moreover, we characterize some typical patterns of the utility gas damages by comparing different styles of the river flood inundations.