Investigation of PN, SIAP, RAI indices in Khuzestan Province with Emphasis on Ahwaz, Abadan, Dezful and Omidieh stations

Subject Areas : hydrology

mussa molaei ¹ , Peyman Gravand ²

1 - Education - Baghmalek - Iran
2 - University of Lorestan

Received: 2018-05-04 Accepted : 2019-05-06 Published : 2018-08-23

Keywords: drought, Khuzestan, PN index, SIAP index, RAI index,

Abstract :

In this paper, the meteorological droughts of four selected stations in Khuzestan based on the annual precipitation index (SIAP), Normal precipitation (PNPI) and precipitation anomalies (RAI) in a 32-year statistical period (1983-2003) were investigated. Drought index coefficients and frequency and severity of drought were determined based on each indicator. Each of the indicators was calculated at the stations. The results showed that frequency and sequence (continuity period) of drought were different in different degrees according to the index of (SIAP) in Dezful in the statistical period. In the PNPI survey, Abandon droughts were more frequent than other stations. The most severe drought occurred in Ahwaz based on this indicator. According to the RAI index, the frequency of drought in Dezful is greater And due to the severity of drought in Omidieh, the highest severity of drought occurred. Finally, among the three indexes studied, the highest drought persistence is related to the( PNPI) index