Variable-resolution building exposure modelling for earthquake and tsunami scenario-based risk assessment: an application case in Lima, Peru

<p>We propose the use of variable resolution boundaries based on central Voronoi tessellations (CVTs) to spatially aggregate building exposure models for risk assessment to various natural hazards. Such a framework is especially beneficial when the spatial distribution of the considered hazard...

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Autores principales:	J. C. Gomez-Zapata, N. Brinckmann, S. Harig, R. Zafrir, M. Pittore, F. Cotton, A. Babeyko
Formato:	article
Lenguaje:	EN
Publicado:	Copernicus Publications 2021
Materias:	Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/e388f63a595c47ee8df31db6c0e2721a
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spelling	oai:doaj.org-article:e388f63a595c47ee8df31db6c0e2721a2021-11-26T07:15:21ZVariable-resolution building exposure modelling for earthquake and tsunami scenario-based risk assessment: an application case in Lima, Peru10.5194/nhess-21-3599-20211561-86331684-9981https://doaj.org/article/e388f63a595c47ee8df31db6c0e2721a2021-11-01T00:00:00Zhttps://nhess.copernicus.org/articles/21/3599/2021/nhess-21-3599-2021.pdfhttps://doaj.org/toc/1561-8633https://doaj.org/toc/1684-9981<p>We propose the use of variable resolution boundaries based on central Voronoi tessellations (CVTs) to spatially aggregate building exposure models for risk assessment to various natural hazards. Such a framework is especially beneficial when the spatial distribution of the considered hazards presents intensity measures with contrasting footprints and spatial correlations, such as in coastal environments. This work avoids the incorrect assumption that a single intensity value from hazards with low spatial correlation (e.g. tsunami) can be considered to be representative within large-sized geo-cells for physical vulnerability assessment, without, at the same time, increasing the complexity of the overall model. We present decoupled earthquake and tsunami scenario-based risk estimates for the residential building stock of Lima (Peru). We observe that earthquake loss models for far-field subduction sources are practically insensitive to the exposure resolution. Conversely, tsunami loss models and associated uncertainties depend on the spatial correlations of the hazard intensities as well as on the resolution of the exposure models. We note that for the portfolio located in the coastal area exposed to both perils in Lima, the ground shaking dominates the losses for lower-magnitude earthquakes, whilst tsunamis cause the most damage for larger-magnitude events. For the latter, two sets of existing empirical flow depth fragility models are used, resulting in large differences in the calculated losses. This study, therefore, raises awareness about the uncertainties associated with the selection of fragility models and spatial aggregation entities for exposure modelling and loss mapping.</p>J. C. Gomez-ZapataJ. C. Gomez-ZapataN. BrinckmannS. HarigR. ZafrirR. ZafrirM. PittoreM. PittoreF. CottonF. CottonA. BabeykoCopernicus PublicationsarticleEnvironmental technology. Sanitary engineeringTD1-1066Geography. Anthropology. RecreationGEnvironmental sciencesGE1-350GeologyQE1-996.5ENNatural Hazards and Earth System Sciences, Vol 21, Pp 3599-3628 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 Geology QE1-996.5
spellingShingle	Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 Geology QE1-996.5 J. C. Gomez-Zapata J. C. Gomez-Zapata N. Brinckmann S. Harig R. Zafrir R. Zafrir M. Pittore M. Pittore F. Cotton F. Cotton A. Babeyko Variable-resolution building exposure modelling for earthquake and tsunami scenario-based risk assessment: an application case in Lima, Peru
description	<p>We propose the use of variable resolution boundaries based on central Voronoi tessellations (CVTs) to spatially aggregate building exposure models for risk assessment to various natural hazards. Such a framework is especially beneficial when the spatial distribution of the considered hazards presents intensity measures with contrasting footprints and spatial correlations, such as in coastal environments. This work avoids the incorrect assumption that a single intensity value from hazards with low spatial correlation (e.g. tsunami) can be considered to be representative within large-sized geo-cells for physical vulnerability assessment, without, at the same time, increasing the complexity of the overall model. We present decoupled earthquake and tsunami scenario-based risk estimates for the residential building stock of Lima (Peru). We observe that earthquake loss models for far-field subduction sources are practically insensitive to the exposure resolution. Conversely, tsunami loss models and associated uncertainties depend on the spatial correlations of the hazard intensities as well as on the resolution of the exposure models. We note that for the portfolio located in the coastal area exposed to both perils in Lima, the ground shaking dominates the losses for lower-magnitude earthquakes, whilst tsunamis cause the most damage for larger-magnitude events. For the latter, two sets of existing empirical flow depth fragility models are used, resulting in large differences in the calculated losses. This study, therefore, raises awareness about the uncertainties associated with the selection of fragility models and spatial aggregation entities for exposure modelling and loss mapping.</p>
format	article
author	J. C. Gomez-Zapata J. C. Gomez-Zapata N. Brinckmann S. Harig R. Zafrir R. Zafrir M. Pittore M. Pittore F. Cotton F. Cotton A. Babeyko
author_facet	J. C. Gomez-Zapata J. C. Gomez-Zapata N. Brinckmann S. Harig R. Zafrir R. Zafrir M. Pittore M. Pittore F. Cotton F. Cotton A. Babeyko
author_sort	J. C. Gomez-Zapata
title	Variable-resolution building exposure modelling for earthquake and tsunami scenario-based risk assessment: an application case in Lima, Peru
title_short	Variable-resolution building exposure modelling for earthquake and tsunami scenario-based risk assessment: an application case in Lima, Peru
title_full	Variable-resolution building exposure modelling for earthquake and tsunami scenario-based risk assessment: an application case in Lima, Peru
title_fullStr	Variable-resolution building exposure modelling for earthquake and tsunami scenario-based risk assessment: an application case in Lima, Peru
title_full_unstemmed	Variable-resolution building exposure modelling for earthquake and tsunami scenario-based risk assessment: an application case in Lima, Peru
title_sort	variable-resolution building exposure modelling for earthquake and tsunami scenario-based risk assessment: an application case in lima, peru
publisher	Copernicus Publications
publishDate	2021
url	https://doaj.org/article/e388f63a595c47ee8df31db6c0e2721a
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Variable-resolution building exposure modelling for earthquake and tsunami scenario-based risk assessment: an application case in Lima, Peru

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