Tam, T H; Abdul Rahman, M Z; Harun, S; Shahid, S; Try, S; Jamal, M H; Ismail, Z; Razak, K A; Ghani, M K and Abdul Wahab, Y F (2025) Flood hazard assessment using design rainfall under climate change scenarios in the Kelantan River Basin, Malaysia. International Journal of Disaster Resilience in the Built Environment, 16(1), pp. 1-19. ISSN 1759-5908
Abstract
Purpose: The present study aims to evaluate the effect of climate change on the flood hazard potential in the Kelantan River Basin using current and future scenarios. Design/methodology/approach: The intensity-duration-frequency (IDF) was used to estimate the current 50- and 100-year return period 24-h design rainfall, and the climate change factor (CCF) was used to compute the future design rainfall. The CCF was calculated from the rainfall projections of two global climate models, CGCM1 and CCSM3, with different pre-processing steps applied to each. The IDF data were used in the rainfall-runoff-inundation model to simulate current and future flood inundation scenarios. Findings: The estimated CCF values demonstrate a contrast, whereby each station had a CCF value greater than one for CGCM1, while some stations had a CCF value of less than one for CCSM3. Therefore, CGCM1 projected an aggravation and CCSM3 a reduction of flood hazard for future scenarios. The study reveals that topography plays an essential role in calculating the CCF. Originality/value: To the best of the author's knowledge, this is the first study to examine flood projections in the Kelantan River Basin. It is, therefore, hoped that these results could benefit local managers and authorities by enabling them to make informed decisions regarding flood risk mitigation in a climate change scenario.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | climate change factor; flood; hazard assessment; inundation; Kelantan river basin; rri |
| Index terms: | methodology, flood risk mitigation, climate change, rainfall, manager, topography, hazard assessment, duration, estimate, Malaysia |
| Subjects: | physical geography and landforms, research methods, Geography, environmental hazards, climate science, practitioner, project controls, financial and cost management |
| Topics: | Time Control, Cost Management, Research Practice, Roles and Professions, Geographical Context, Sustainability |
| Descriptive scope: | 3 PCT |
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