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...
| Auteurs principaux: | , , , , , , |
|---|---|
| Format: | Article |
| Publié: |
Multidisciplinary Digital Publishing Institute
2022
|
| _version_ | 1825938821140709376 |
|---|---|
| author | Fatdillah, Eva Rehan, Balqis M. Rameshwaran, Ponnambalam Bell, Victoria A. Zulkafli, Zed Yusuf, Badronnisa Sayers, Paul |
| author_facet | Fatdillah, Eva Rehan, Balqis M. Rameshwaran, Ponnambalam Bell, Victoria A. Zulkafli, Zed Yusuf, Badronnisa Sayers, Paul |
| author_sort | Fatdillah, Eva |
| collection | UPM |
| 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. |
| first_indexed | 2024-03-06T11:18:02Z |
| format | Article |
| id | upm.eprints-103262 |
| institution | Universiti Putra Malaysia |
| last_indexed | 2024-03-06T11:18:02Z |
| publishDate | 2022 |
| publisher | Multidisciplinary Digital Publishing Institute |
| record_format | dspace |
| spelling | 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 |
| 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 |
| title | 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_short | 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 |
| work_keys_str_mv | AT fatdillaheva spatialestimatesofflooddamageandriskareinfluencedbytheunderpinningdemresolutionacasestudyinkualalumpurmalaysia AT rehanbalqism spatialestimatesofflooddamageandriskareinfluencedbytheunderpinningdemresolutionacasestudyinkualalumpurmalaysia AT rameshwaranponnambalam spatialestimatesofflooddamageandriskareinfluencedbytheunderpinningdemresolutionacasestudyinkualalumpurmalaysia AT bellvictoriaa spatialestimatesofflooddamageandriskareinfluencedbytheunderpinningdemresolutionacasestudyinkualalumpurmalaysia AT zulkaflized spatialestimatesofflooddamageandriskareinfluencedbytheunderpinningdemresolutionacasestudyinkualalumpurmalaysia AT yusufbadronnisa spatialestimatesofflooddamageandriskareinfluencedbytheunderpinningdemresolutionacasestudyinkualalumpurmalaysia AT sayerspaul spatialestimatesofflooddamageandriskareinfluencedbytheunderpinningdemresolutionacasestudyinkualalumpurmalaysia |