Author(s): Zati Sharip, Abd. Jalil Hassan, Mohd Zaki Mat Amin, Saim Suratman, Azuhan Mohamed
Linked Author(s): Zati Sharip
Keywords: Drought, lake basin, hydrology, hydrodynamic model, water transfer
Abstract: Climate change is acknowledged to affect hydrological processes and water resources sustainability. Predicting the impact of changing climate on reservoir water quantity and quality is necessary to ensure adequate supply of reasonable quality of raw water. An integrated hydrological and catchment management model is developed for Sg. Terip Reservoir using Infowork Integrated Catchment Model by means of hydrology Probability Distributed Moisture model to simulate the changes of reservoir inflow and capacity, and quality. Rainfall data at three nearby stations are used to calibrate the hydrological model over the period of 2010-2013. Future hydroclimate projection data at the lake catchment based on the downscaled of coarse resolution global climate model projection to 6km grid resolution by means of a regional hydroclimate model over Peninsular Malaysia are used to simulate the climate change impact on the water balance and water quality. The existing water balance of Sg. Terip reservoir is largely impacted by the river water abstraction at the nearby water supply intake and the water source from two water transfer schemes. Inflows from main tributaries are small. Existing water quality assessment showed good water quality throughout the measurement period. Long droughts will have large impact on the reservoir storage capacity. Impact assessment is carried out based on 3 time slices: 2010-2040, 2040-2070, and 2070-2100. Hydroclimate projection under the worst case scenario, IPCC SRES A1FI of the global circulation model - CCSM3 shows that the lake catchment will receive lower rainfall amount in the mid of 21st century (2040-2070) and higher rainfall amount at the end of the 21st century (2070-2100). Simulation results indicate that lake water quality will change only slightly with alteration in these future rainfall events due to low pollution sources. Reservoir water quality may be influenced by the quality of water transferred into the water body
Year: 2017