Chang, Hsueh-Sheng and Hsu, Chih-Po (2025) Levee Effect and Urban Development under Climate Change: Land-Use Strategies for Managing Residual Flood Risk in Taiwan. URBAN INNOVATION: TO BOLDLY GO WHERE NO CITIES HAVE GONE BEFORE. Medium sized cities and towns as a major arena of global urbanisation. Proceedings of REAL CORP 2025, 30th Intl. Conference on Urban Development, Regional Planning and Information Society. pp. 687-698. ISSN 2521-3938
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Text (Levee Effect and Urban Development under Climate Change: Land-Use Strategies for Managing Residual Flood Risk in Taiwan)
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Abstract
Urban flooding has become an increasingly severe challenge due to rapid urbanization and climate change, particularly in regions like Taiwan. The combination of steep rivers, mountainous terrain, and frequent typhoons heightens the risk of flooding. Traditional flood control measures, such as levees and drainage systems, have provided protection, but they have also led to unintended consequences. One notable consequence is the Levee Effect, where flood protection infrastructure encourages urban expansion into flood-prone areas, ultimately increasing long-term exposure to extreme flood events.This issue underscores the importance of addressing Residual Flood Risk, which remains even with existing flood control measures, especially regarding land-use dynamics.In this study, we integrated CA-Markov and SOBEK 1D-2D models to evaluate land-use changes and flood risk under different levee heights (6 meters and 10 meters) in Wugu District, Taiwan. Preliminary results indicate that land-use change is closely linked to flood inundation. While flood protection measures reduce inundation areas, urban expansion driven by these measures can still lead to increased flood risk under extreme rainfall events due to changes in land use patterns.In the event of a 650 mm rainfall over 24 hours, unrestricted development significantly raised flood risk and potential economic damages. Conversely, imposing development restrictions effectively reduced potential damages. These findings emphasize the necessity of land-use controls in managing residual flood risk.While levees can lessen flooding under typical conditions, they also promote land development that increases vulnerability to extreme events.This study highlights the need for a hybrid flood risk management strategy that balances structural defences with spatial planning and adaptive policies to improve climate resilience and support sustainable urban development.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | levee effect, residual flood risk, land use management, CA-Markov, SOBEK model |
| Subjects: | H Social Sciences > HD Industries. Land use. Labor T Technology > TA Engineering (General). Civil engineering (General) T Technology > TD Environmental technology. Sanitary engineering |
| Depositing User: | The CORP Team |
| Date Deposited: | 26 May 2025 13:23 |
| Last Modified: | 07 Jul 2025 09:10 |
| URI: | http://repository.corp.at/id/eprint/1251 |
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