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
ISSN: 1759-5908
Article publication date: 28 February 2023
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.
Keywords
Acknowledgements
The authors like to express their gratitude to the National Hydraulic Research Institute of Malaysia (NAHRIM) for providing the meteo-hydrological data for this study. Takahiro Sayama deserves special thanks for developing the RRI model as a public domain paradigm. Finally, the authors wish to express appreciation to the financial support from Universiti Teknologi Malaysia (UTM) for the funding under UTM Encouragement Grant (UTMER) (Q.J130000.3852.19J74) and University of Salford for funding an International Grant (R.K130000.7343.4B781).
Citation
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. (2023), "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, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/IJDRBE-05-2022-0048
Publisher
:Emerald Publishing Limited
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