List of Articles RAI index

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  1 - Analysis of the effect of precipitation anomalies during the occurrence of severe wet in southern Iran in the last three solar cycles
  FARNAZ mashayekh hassan lashkari Seyed jamaledin Daryabary mohsen Ranjbar
  In this study, the impact of precipitation anomalies during the occurrence of severe and extremely severe Wet in southern Iran has been investigated. The research design involves the following steps. 1- The daily and annual rainfall data of the synoptic stations of the More

  In this study, the impact of precipitation anomalies during the occurrence of severe and extremely severe Wet in southern Iran has been investigated. The research design involves the following steps. 1- The daily and annual rainfall data of the synoptic stations of the study area were extracted from the data of the Meteorological Organization. 2- The statistical base has been chosen to adapt to the solar cycles of a 33-year period corresponding to the years 1986-2019. 3- The number of 19 synoptic stations that had these conditions were selected. 4- Wet years were determined based on standard precipitation indices (SPI), Chinese Z (CZI), Z score (ZSI). 5- To check the anomaly of precipitation RAI index is used. 6- Based on the declared indicators, with the criteria of 30% repetition in selected stations, 6 severe wet and based on 50% repetition in selected stations, three severe wets have occurred in the statistical period of 33 years. 7- In this research, two seasons of 1992-1993 and 1995-1996 have been examined in terms of anomaly indices and other rainfall characteristics. In the wet and extremely severe years, the annual rainfall was more than two and sometimes three times the long-term average in many stations. In terms of the number of rainy days in the years 1993-1992 in 10 stations and in the wet years 1996-1995 in 17 stations, rainy days over 30 days have been recorded. However, the number of rainy days in both wet years does not show a proportional Manuscript profile
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  2 - Investigation of PN, SIAP, RAI indices in Khuzestan Province with Emphasis on Ahwaz, Abadan, Dezful and Omidieh stations
  mussa molaei Peyman Gravand
  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 c More

  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 Manuscript profile