Assessment of climate change impact on water availability in the upper Dong Nai River Basin, Vietnam

Abstract On a global scale, climate change is projected to have detrimental impacts on water availability. This situation will become more severe owing accumulated of and anthropogenic activities. study aims investigate impact availability in the upper Dong Nai River Basin using Soil Water Assessment Tool (SWAT) Evaluation Planning (WEAP) models. Future rainfall scenarios were downscaled from five different general circulation models under RCP4.5 RCP8.5 Long Ashton Research Station Weather Generator (LARS-WG) tool. Under impact, annual river discharge region generally upward trends future, except for near-future period 2030s RCP4.5. In addition, dry-seasonal expected be increased future. Considering baseline condition use, there was an shortage approximately 32.9 × 103 m3, which mostly occurred dry season January March. Climate may reduce ranging 7.0 30.1% combined increasing demand, vary −18.6 6.0% The results can provide valuable insights implement appropriate future resources planning management region.