Climate change is expected to alter the major components of hydrological regime such as streamflow and water availability. The magnitude and their impacts are still uncertain. Therefore, it is highly required to study streamflow and flood vulnerability in tropical river basins particularly urbanised basin such as Langat River Basin. This study aims to model the future streamflow of Langat River Basin due to climate change using Rainfall-Runoff Inundation (RRI) model. Daily rainfall data obtained from Department of Irrigation and Drainage Malaysia and topographic data from HydroSHEDS at 15-second resolution were used. The projected future rainfall (2075–2099) is extracted from MRI-AGCM3.2s under the worst carbon emission scenario, RCP8.5. The annual maximum series of 1-day rainfall is selected for statistical bias correction using Quantile Mapping. The General Circulation Model data were found to be greatly corrected with reasonable Nash–Sutcliffe efficiency, Percent bias and Root Mean Square Error values. The mean of maximum 1-day future rainfall in Langat River Basin is found to be inconsistent where parts of the upstream will experience an increment at about 7% while other parts decrease at 8%. Meanwhile, the rainfall at downstream area are expected to decrease at 40%. Based on RRI simulation, the future streamflow can achieve up to 92% increment.
The authors would like to state their appreciation to the funding from the Universiti Teknologi Malaysia and the Malaysian Ministry of Higher Education under the GUP2018 grants VOT QJ130000.2522.19H68, UTMFR2020 VOT Q.J130000.2551.20H75 and FRGS VOT R.J130000.7851.5F032. The authors also thank the Department of Irrigation and Drainage (DID) Malaysia for providing rainfall data and the surveyed cross sections of Langat River Basin. Gratitude is also for JASTIP fund support. The JASTIP research was supported by Japan Science and Technology Agency, Collaboration Hubs for International Research Program within the framework of the Strategic International Collaborative Research Program.
Anuar, U.H.M. and Alias, N.E. (2021), "Modelling The Impact of Climate Change on the Streamflow of Langat River Basin", Alias, N.E., Haniffah, M.R.M. and Harun, S. (Ed.) Water Management and Sustainability in Asia (Community, Environment and Disaster Risk Management, Vol. 23), Emerald Publishing Limited, Bingley, pp. 65-76. https://doi.org/10.1108/S2040-726220210000023013
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