The trend of climate and runoff changes in the Ba river basin
A warming planet and changing climate will alter the distribution, volume, timing and type of rainfall, and will modifythe distribution and timing of run-off. Many regions around the world show that climate change is having an overall netnegative impact on water resources and freshwater ecosystems. The impact of climate change on local dischargevariability is considered in the Ba river basin. Ba river basin is the largest basin of the South Central region, located inthe four provinces of Kon Tum, Gia Lai, Dak Lak and Phu Yen, with a catchment area of 13,900 km2.This research applied the Mann-Kendall model to calculate and evaluate the trend of climate and runoff changes inthe Ba river basin. The result of calculation showed the increase of temperature over the Ba basin except the minimumtemperature at An Khe station. In the central of the basin - the dry area - the rainfall tends to decrease while that in thelower area tends to increase. The maximum daily rainfall tends to decrease in almost of the meteorological stationsexcept for the An Khe station. The annual runoff in the Ba river basin tends to increase whereas the maximum river flowtends to decline. The minimum river flow tends to decrease in the lower and increase in the upper area. In particulaly,the maximum and minimum sediments tend to increase in the Ba river basin.
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