Analysis of unusal behavior of water distribution system in earthquake by monte carlo simulation
| Autor: | Murata, Kouichi, Miyajima, Masakatsu |
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| Jazyk: | japonština |
| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | 土木学会地震工学論文集 = Proceedings of the JSCE Earthquake Engineering Symposium. 29:605-612 |
| ISSN: | 1880-4624 |
| Popis: | 金沢大学理工研究域地球社会基盤学系 Japan is situated in one of the most active seismic zones in the world. Many strong earthquakes of seismic intensity 5 or more have occurred in Japan within a short period after the 1995 Hyogoken-Nanbu Earthquake. In earthquakes of seismic intensity 5 or more, the long-period component of seismic motion is propagated over 200 km or more distances from the focus, and some of such earthquakes were noticeable in Osaka City even though the city was situated distantly from the focus. Although no Osaka Municipal Waterworks Bureau (OMWB) suffered physical damage from these earthquakes, unusual phenomena such as an abrupt increase in flow rate and a decrease in water pressure were observed right after the occurrence of the earthquake.The present study studies this phenomenon, focuses on sloshing in water receiving tanks as a possible cause of the phenomenon, and discusses causal relationship from the observed data. The relationship between the amount of sloshing in the water receiving tank and the frequency characteristics of seismic motion is analyzed by using seismic wave data observed in OMWB. 水道供給システムでは地震が発生した直後, システムに物理的なダメージが無くても急激な流量増加と水圧減少という異常挙動現象を発生することがある. この異常挙動現象は, 大規模漏水が発生した現象に酷似しており, 管路被害による漏水なのか異常挙動によるものかを確認することが困難であるため, 地震被害把握等の災害復旧過程における初動体制確立に影響を及ぼす可能性がある. 本論文では, これらの原因と考えられるやや長周期地震動による受水槽のスロッシングと異常挙動の関係について考察するとともに, モンテカルロシミュレーションを用いた管網計算により, 水道供給システムへの影響を定量的な分析を行った. |
| Databáze: | OpenAIRE |
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