Effect of ENSO on Annual Maximum Floods and Volume Over Threshold in Southwestern Region of Iran

AuthorsSaghafian, B - Haghnegahdar, A - Dehghani, M
JournalHydrological Sciences Journal
Presented byTechnical and Engineering Department, Science and Research Branch Islamic Azad University
Page number1039-1049
Volume number62
Paper TypeFull Paper
Published At2017
Journal GradeScientific - research
Journal TypeTypographic
Journal CountryIran, Islamic Republic Of


In this paper, the  effects  of the El Niño-Southern Oscillation (ENSO) on the annual maximum flood (AMF) and volume over threshold (VOT) in two major neighbouring river basins in southwest Iran are investigated. The basins are located upstream of the Dez and Karun-I dams and cover over 40 000 km2 in total area. The effects of ENSO on the frequency, magnitude and severity (frequency times magnitude) of flood characteristics over the March–April period were analysed. ENSO indices were also correlated with both AMF and VOT. The results indicate that, in the Dez and Karun basins, the El Niño phenomenon intensifies March–April floods compared with neutral conditions. The opposite is true in La Niña conditions. The degree of the effect is more intense in the El Niño period.

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