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Water 2019, 11(4), 751; https://doi.org/10.3390/w11040751

Residential Flood Loss Assessment and Risk Mapping from High-Resolution Simulation

1
International Master Program on Natural Hazards Mitigation and Management, National Cheng Kung University, Tainan City 701, Taiwan
2
Department of Geomatics, National Cheng Kung University, Tainan City 701, Taiwan
3
Department of Economics, National Cheng Kung University, Tainan City 701, Taiwan
4
Hydrotech Research Institute, National Taiwan University, Taipei 10617, Taiwan
5
Department of Hydraulics and Ocean Engineering, National Cheng Kung University, Tainan City 701, Taiwan
*
Author to whom correspondence should be addressed.
Received: 12 March 2019 / Revised: 8 April 2019 / Accepted: 8 April 2019 / Published: 10 April 2019
(This article belongs to the Special Issue Recent Advances in the Assessment of Flood Risk in Urban Areas)
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Abstract

Since the patterns of residential buildings in the urban area are small-sized and dispersed, this study proposes a high-resolution flood loss and risk assessment model to analyze the direct loss and risk impacts caused by floods. The flood inundation simulation with a fine digital elevation model (DEM) provides detailed estimations of flood-inundated areas and their corresponding inundation depths during the 2016 Typhoon Megi and 2017 Typhoon Haitang. The flood loss assessment identifies the impacts of both events on residential areas. The depth-damage table from surveys in the impacted area was applied. Results indicated that the flood simulation with the depth-damage table is an effective way to assess the direct loss of a flood disaster. The study also showed the effects of spatial resolution on the residential loss. The results indicated that the low-resolution model easily caused the estimated error of loss in dispersed residential areas when compared with the high-resolution model. The analytic hierarchy process (AHP), as a multi-criteria decision-making method, was used to identify the weight factor for each vulnerability factor. The flood-vulnerable area was mapped using natural and social vulnerability factors, such as high-resolution DEM, distance to river, distance to fire station, and population density. Eventually, the flood risk map was derived from the vulnerability and flood hazard maps to present the risk level of the flood disaster in the residential areas. View Full-Text
Keywords: flood; 3Di; loss assessment; analytic hierarchy process (AHP); risk map flood; 3Di; loss assessment; analytic hierarchy process (AHP); risk map
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Afifi, Z.; Chu, H.-J.; Kuo, Y.-L.; Hsu, Y.-C.; Wong, H.-K.; Zeeshan Ali, M. Residential Flood Loss Assessment and Risk Mapping from High-Resolution Simulation. Water 2019, 11, 751.

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