Vulnerability of Physical Infrastructure Network Components to Damage from the 2015 Illapel Tsunami, Coquimbo, Chile

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
James H. Williams, Ryan Paulik, Rafael Aránguiz, Alec Wild
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Abstract

This study assesses physical infrastructure vulnerability for infrastructure network components exposed during the 2015 Illapel tsunami in Coquimbo, Chile. We analyse road and utility pole vulnerability to damage, based on interpolated and simulated tsunami hazard intensity (flow depth, flow velocity, hydrodynamic force and momentum flux) and network component characteristics. A Random Forest Model and Spearman’s Rank correlation test are applied to analyse variable importance and monotonic relationships, with respect to damage, between tsunami hazards and network component attributes. These models and tests reveal that flow depth correlates higher with damage, relative to flow velocity, hydrodynamic force and momentum flux. Scour (for roads and utility poles) and debris strikes (for utility poles) are strongly correlated with damage. A cumulative link model methodology is used to fit fragility curves. These fragility curves reveal that, in response to flow depth, Coquimbo roads have higher vulnerability than those analysed in previous tsunami event studies, while utility poles demonstrate lower vulnerability than with previous studies. Although we identify tsunami flow depth as the most important hydrodynamic hazard intensity metric, for causing road and utility pole damage, multiple characteristics correlate with damage and should also be considered when classifying infrastructure damage levels.

Abstract Image

有形基础设施网络组件易受 2015 年智利科金博伊拉佩尔海啸破坏影响的程度
本研究评估了 2015 年智利科金博伊拉佩尔海啸期间暴露在海啸中的基础设施网络组件的有形基础设施脆弱性。我们根据插值和模拟的海啸危害强度(水流深度、流速、流体动力和动量通量)以及网络组件特征,分析了道路和电线杆易受损坏的程度。随机森林模型和斯皮尔曼等级相关性检验被用来分析海啸危害和网络组成部分属性之间的变量重要性和单调关系。这些模型和测试表明,相对于流速、流体动力和动量通量,水流深度与损害的相关性更高。冲刷(对于道路和电线杆)和碎片撞击(对于电线杆)与损害密切相关。采用累积联系模型方法拟合脆性曲线。这些脆性曲线显示,与以前的海啸事件研究相比,科金博道路的脆性随水流深度的增加而增加,而电线杆的脆性则比以前的研究低。尽管我们认为海啸水流深度是造成道路和电线杆损坏的最重要的水动力危害强度指标,但多种特征与损坏程度相关,在划分基础设施损坏等级时也应加以考虑。
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来源期刊
pure and applied geophysics
pure and applied geophysics 地学-地球化学与地球物理
CiteScore
4.20
自引率
5.00%
发文量
240
审稿时长
9.8 months
期刊介绍: pure and applied geophysics (pageoph), a continuation of the journal "Geofisica pura e applicata", publishes original scientific contributions in the fields of solid Earth, atmospheric and oceanic sciences. Regular and special issues feature thought-provoking reports on active areas of current research and state-of-the-art surveys. Long running journal, founded in 1939 as Geofisica pura e applicata Publishes peer-reviewed original scientific contributions and state-of-the-art surveys in solid earth and atmospheric sciences Features thought-provoking reports on active areas of current research and is a major source for publications on tsunami research Coverage extends to research topics in oceanic sciences See Instructions for Authors on the right hand side.
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