Effects of Enso on drought in Cai river basin

Abstract

     Cai river basin (LSC) lies in the central of Vietnam. Thus, understanding the properties of meteorological drought in Songcai basin is very important. This paper used the SPEI and SPI for evaluating meteorological drought events. The SPEI/SPI at years of El Nino and La Nina is also considered. Furthermore, the relationships between active ENSO and meteorological drought events are analyzed by correlational analysis method. The study showed that: In the LSC, the frequency of meteorological drought is very high, mostly occur in the the rainy season; In the El Nino years, meteorological drought occurrence is very likely, and the correlation between SSTA in four zones areas with SPEI/SPI confirms the the cycle of El Nino. SST in both NinoW and Nino4 zones have great effect on the meteorological drought events, particularly in NinoW.