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Enhancement of large-scale flood risk assessments using building-material-based vulnerability curves for an object-based approach in urban and rural areas.

Authors :
Englhardt, Johanna
de Moel, Hans
Huyck, Charles K.
de Ruiter, Marleen C.
Aerts, Jeroen C. J. H.
Ward, Philip J.
Source :
Natural Hazards & Earth System Sciences; 2019, Vol. 19 Issue 8, p1703-1722, 20p
Publication Year :
2019

Abstract

In this study, we developed an enhanced approach for large-scale flood damage and risk assessments that uses characteristics of buildings and the built environment as object-based information to represent exposure and vulnerability to flooding. Most current large-scale assessments use an aggregated land-use category to represent the exposure, treating all exposed elements the same. For large areas where previously only coarse information existed such as in Africa, more detailed exposure data are becoming available. For our approach, a direct relation between the construction type and building material of the exposed elements is used to develop vulnerability curves. We further present a method to differentiate flood risk in urban and rural areas based on characteristics of the built environment. We applied the model to Ethiopia and found that rural flood risk accounts for about 22 % of simulated damage; rural damage is generally neglected in the typical land-use-based damage models, particularly at this scale. Our approach is particularly interesting for studies in areas where there is a large variation in construction types in the building stock, such as developing countries. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
15618633
Volume :
19
Issue :
8
Database :
Complementary Index
Journal :
Natural Hazards & Earth System Sciences
Publication Type :
Academic Journal
Accession number :
138462386
Full Text :
https://doi.org/10.5194/nhess-19-1703-2019