SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Resolution dependence of regional hydro-climatic projection: A case-study for the Johor River Basin, Malaysia 
Authors:Tan, M.L., J. Liang, M. Hawcroft, J.M. Haywood, F. Zhang, R. Rainis and W.R. Ismail 
Volume (Issue):13(22) 
Article ID:3158 
URL (non-DOI journals): 
Broad Application Category:hydrologic only 
Primary Application Category:climate change assessment 
Secondary Application Category:hydrologic assessment 
Watershed Description:1644 km^2 Johor River, located in the southern part of Peninsular Malaysia. 
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Validation Summary: 
General Comments: 
Abstract:High resolution models from the High-Resolution Model Intercomparison Project (High- ResMIP), part of CMIP6, have the capacity to allow a better representation of the climate system in tropical regions, but how different model resolutions affect hydrological outputs remains unclear. This research aims to evaluate projections of hydro-climatic change of the Johor River Basin (JRB) in southern Peninsular Malaysia between 1985 to 2015 and 2021 to 2050, focusing on uncertainty quantification of hydrological outputs from low (>1 deg), medium (0.5 deg to 1 deg) and high (<= 0.5 deg) horizontal resolution models. These projections show future increases in annual precipitation of 0.4 to 3.1%, minimum and maximum temperature increases of 0.8 to 0.9 deg C and 0.9 to 1.1 deg C, respectively. These projected climate changes lead to increases in annual mean streamflow of 0.9% to 7.0% and surface runoff of 7.0% to 20.6% in the JRB. These annual mean changes are consistent with those during the wet period (November to December), e.g., streamflow increases of 4.9% to 10.8% and surface runoff of 28.8 to 39.9% in December. Disagreement in the direction of change is found during the dry seasons, (February to March and May to September), where high resolution models project a decrease in future monthly precipitation and streamflow, whilst increases are projected by the medium- and low-resolution models. 
Keywords:climate change; CMIP6; HighResMIP; SWAT; water resource; resolution; Malaysia; Joho