In some areas, the flood season tends to shift gradually towards the end of the year, making the flood season appear later than before, but there are also areas where the flood season occurs earlier. The paper specifically analyzes changes in the distribution of flood season in a year under the impact of climate change in some areas in the Ca River basin, central Viet Nam. | VIETNAM JOURNAL OF HYDROMETEOROLOGY Research Article Impact of climate change on seasonal distribution of flows in Ca basin Central Viet Nam Huynh Thi Lan Huong1 1 VietnamInstitute of Meteorology Hydrology and Climate change huynhlanhuong@ Correspondence huynhlanhuong@ Tel 84 912119740 Received 04 February 2021 Accepted 24 April 2021 Published 25 April 2021 Abstract Climate change has been impacting both natural and human resources greatly. Flow in river basins is subjected to strongly affect due to its direct relevance to climatic factors. Many changes in the distribution of runoff on river basins throughout the year due to the impact of climate change CC have been observed. In some areas the flood season tends to shift gradually towards the end of the year making the flood season appear later than before but there are also areas where the flood season occurs earlier. The paper specifically analyzes changes in the distribution of flood season in a year under the impact of climate change in some areas in the Ca River basin central Viet Nam. Keywords Climate change River flow Flow distribution Ca River basin. 1. Introduction At present climate change continues to be one of the most concerning global issues along with the coronavirus pandemic 1 . Climate warming will alter several water cycle components such as varying the pattern and intensity of precipitation increasing water vapor and evaporation and changing runoff 2 . Particularly climate change is projected to exacerbate the change of flow regimes in Vietnam significantly. River flow varies over space and time therefore knowledge about changing river flow regimes is paramount for assessing climate change risks related to freshwater. Estimation of changes in seasonality inter-annual variability statistical low and high flows and floods and droughts is required to understand the impact of climate change on humans and freshwater ecosystems 3 . Climate change impact studies for river basins .
