Numerical comparison of RAI and PNPI meteorological indices to assess and quantify the drought situation in Khuzestan province

Document Type : Research Article


1 Assistant Professor, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran

2 MSc. Student, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran


Over the past few decades, the frequency and number of drought occurrence has been more than other natural disasters influencing human societies. Drought is a kind of natural disaster formed and extended smoothly and in a crawling way in comparison with other natural hazards like heavy precipitations and floodwaters. There are different and numerous indicators for quantitative expression of drought. Percentage Indicators of normal precipitation (PNPI) and precipitation abnormality (RAI) status and continuation of drought in 8 stations of Abadan, Ahvaz, Bandar-e Mahshahr, Bostan, Masjed Soleyman, Omidieh, Ramhormoz and Safi Abad in Khuzestan province during the statistical period (1990-2014) have been considered in this research. As the obtained results show, based on PNPI indicator, the most severe drought happened during period 1990-2014 in Bandar- e Mahshahr station with the amount of 20.39 in 2010. Also, the most severe wet period happened in Ahvaz station with the amount of 216.33 in 1997, based on PNPI indicator. Also, based on RAI indicator, the most severe drought happened in Bandar- e Mahshahr with the amount of 6.26 in 2010 during the period 1990-2014. Based on RAI indicator, the most severe wet period occurred in Ahvaz station with the amount of 8.6 in 1997.


Main Subjects

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Volume 4, Issue 3
September 2017
Pages 923-930
  • Receive Date: 31 January 2017
  • Revise Date: 18 July 2017
  • Accept Date: 20 May 2017
  • First Publish Date: 23 September 2017