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Spatial estimates of flood damage and risk are influenced by the underpinning DEM resolution: a case study in Kuala Lumpur, Malaysia

The sensitivity of simulated flood depth and area to DEM resolution are acknowledged, but their effects on flood damage and risk estimates are less well understood. This study sought to analyse the relative benefits of using global DEMs of different resolution sizes, 5 m AW3D Standard, 12.5 m ALOS P...

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Main Authors: Fatdillah, Eva, Rehan, Balqis M., Rameshwaran, Ponnambalam, Bell, Victoria A., Zulkafli, Zed, Yusuf, Badronnisa, Sayers, Paul
Format: Article
Published: Multidisciplinary Digital Publishing Institute 2022
Online Access:http://psasir.upm.edu.my/id/eprint/103262/
https://www.mdpi.com/2073-4441/14/14/2208
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spelling my.upm.eprints.1032622023-11-22T04:04:25Z http://psasir.upm.edu.my/id/eprint/103262/ Spatial estimates of flood damage and risk are influenced by the underpinning DEM resolution: a case study in Kuala Lumpur, Malaysia Fatdillah, Eva Rehan, Balqis M. Rameshwaran, Ponnambalam Bell, Victoria A. Zulkafli, Zed Yusuf, Badronnisa Sayers, Paul The sensitivity of simulated flood depth and area to DEM resolution are acknowledged, but their effects on flood damage and risk estimates are less well understood. This study sought to analyse the relative benefits of using global DEMs of different resolution sizes, 5 m AW3D Standard, 12.5 m ALOS PALSAR and 30 m SRTM, to simulate flood inundation, damage and risk. The HEC-RAS 2D model was adopted for flood simulations, and the Toba River in the Klang River Basin in Malaysia was chosen for the case study. Simulated inundation areas from AW3D coincide the most with reported flooded areas, but the coarser-resolution DEMs did capture some of the reported flooded areas. The inundation area increased as the resolution got finer. As a result, AW3D returned almost double flood damage and risk estimates compared to ALOS PALSAR, and almost quadruple compared to SRTM for building-level damage and risk analysis. The findings indicate that a finer-resolution DEM improves inundation modelling and could provide greater flood damage and risk estimates compared to a coarser DEM. However, DEMs of coarser resolution remain useful in data-scarce regions or for large-scale assessments in efforts to manage flood risk. Multidisciplinary Digital Publishing Institute 2022 Article PeerReviewed Fatdillah, Eva and Rehan, Balqis M. and Rameshwaran, Ponnambalam and Bell, Victoria A. and Zulkafli, Zed and Yusuf, Badronnisa and Sayers, Paul (2022) Spatial estimates of flood damage and risk are influenced by the underpinning DEM resolution: a case study in Kuala Lumpur, Malaysia. Water, 14 (14). art. no. 2208. pp. 1-18. ISSN 2073-4441 https://www.mdpi.com/2073-4441/14/14/2208 10.3390/w14142208
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
description The sensitivity of simulated flood depth and area to DEM resolution are acknowledged, but their effects on flood damage and risk estimates are less well understood. This study sought to analyse the relative benefits of using global DEMs of different resolution sizes, 5 m AW3D Standard, 12.5 m ALOS PALSAR and 30 m SRTM, to simulate flood inundation, damage and risk. The HEC-RAS 2D model was adopted for flood simulations, and the Toba River in the Klang River Basin in Malaysia was chosen for the case study. Simulated inundation areas from AW3D coincide the most with reported flooded areas, but the coarser-resolution DEMs did capture some of the reported flooded areas. The inundation area increased as the resolution got finer. As a result, AW3D returned almost double flood damage and risk estimates compared to ALOS PALSAR, and almost quadruple compared to SRTM for building-level damage and risk analysis. The findings indicate that a finer-resolution DEM improves inundation modelling and could provide greater flood damage and risk estimates compared to a coarser DEM. However, DEMs of coarser resolution remain useful in data-scarce regions or for large-scale assessments in efforts to manage flood risk.
format Article
author Fatdillah, Eva
Rehan, Balqis M.
Rameshwaran, Ponnambalam
Bell, Victoria A.
Zulkafli, Zed
Yusuf, Badronnisa
Sayers, Paul
spellingShingle Fatdillah, Eva
Rehan, Balqis M.
Rameshwaran, Ponnambalam
Bell, Victoria A.
Zulkafli, Zed
Yusuf, Badronnisa
Sayers, Paul
Spatial estimates of flood damage and risk are influenced by the underpinning DEM resolution: a case study in Kuala Lumpur, Malaysia
author_facet Fatdillah, Eva
Rehan, Balqis M.
Rameshwaran, Ponnambalam
Bell, Victoria A.
Zulkafli, Zed
Yusuf, Badronnisa
Sayers, Paul
author_sort Fatdillah, Eva
title Spatial estimates of flood damage and risk are influenced by the underpinning DEM resolution: a case study in Kuala Lumpur, Malaysia
title_short Spatial estimates of flood damage and risk are influenced by the underpinning DEM resolution: a case study in Kuala Lumpur, Malaysia
title_full Spatial estimates of flood damage and risk are influenced by the underpinning DEM resolution: a case study in Kuala Lumpur, Malaysia
title_fullStr Spatial estimates of flood damage and risk are influenced by the underpinning DEM resolution: a case study in Kuala Lumpur, Malaysia
title_full_unstemmed Spatial estimates of flood damage and risk are influenced by the underpinning DEM resolution: a case study in Kuala Lumpur, Malaysia
title_sort spatial estimates of flood damage and risk are influenced by the underpinning dem resolution: a case study in kuala lumpur, malaysia
publisher Multidisciplinary Digital Publishing Institute
publishDate 2022
url http://psasir.upm.edu.my/id/eprint/103262/
https://www.mdpi.com/2073-4441/14/14/2208
_version_ 1783879945718595584
score 13.211869

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