ESTIMATION OF UNASSUMED TSUNAMI DAMAGE OF SEWER SYSTEM IN WAJIMA CITY BY INTEGRATED OVERGROUND-UNDERGROUND INUNDATION SIMULATION MODEL

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  • 地上・地下統合浸水解析モデルを用いた輪島市下水道施設の津波による未想定被害の検討

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 The 2011 off the Pacific coast of Tohoku Earthquake Tsunami devastated not only houses but also sewer systems. It is important to discuss the risk of tsunami damage to sewer systems and to make business continuity plan (BCP) in advance. The purpose of this study is to discuss insufficiency of the BCP and possibility of unassumed tsunami damage in Wajima City. Wajima is facing to the Sea of Japan and assumed possible maximum tsunami inundation by the north offshore Noto earthquake model. The overground modelling uses elevation and road information data, and the underground modelling uses sewer system data, such as size and location of manholes, and length, depth, and gradient of pipes. The integrated overground-underground inundation model simulates the tsunami floods not only on the ground but also into the sewer. The detail analysis indicates not a few pipes were filled by tsunami inundation and water level in manhole became high. High water level of manhole compresses the air and increases the possibility of manhole cover detachment.

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