매크로조네이션에 기반한 상수도 시스템의 지진 재해 위험도 평가

초록

Seismic risk analysis of water distribution system (WDS) is essential to prepare potential seismic disaster. Previously, most seismic risk analyses for the WDS have been evaluated based on microzonation. However, microzonation has some limitations which are 1) unable to consider risk correlations among regions and 2) unable to detect more damaged regions in a relative sense. In contrast, macrozonation has the advantage when easily comparing the relative disaster risks across large regions. Hence, for the relative evaluation of seismic risk in a wide region, this study evaluates the seismic risk of the WDS for 25 districts in Seoul based on macrozonation. The locations and statistics of the Seoul WDS that consists of water intake station, water treatment plant, water reservoir, and pipelines were collected from the National Waterworks Information System and the Seoul Open Data Plaza. In addition, fragility functions of main facilities and repair rate of pipelines from the Federal Emergency Management Agency were utilized. Applying the same hazard level to all districts, the relative seismic risk of the WDS were calculated. The result shows that the south-eastern and some districts (Seongbuk-gu and Gangseo-gu) are more vulnerable and northern districts are less vulnerable. We expect that the outcome of this study can be utilized for disaster preparedness strategies and future urban planning against the seismic risk of the WDS.

키워드