Evaluation of meteorological drought efficiency in assessment of drought (Case study: Fars province)

Document Type : Research Article

Authors

1 Assistant Professor, Department of Water Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran

2 Graduated Student, Department of Water Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran

3 Professor, Department of Hydrology and Water Resources, Water and Environment Engineering Faculty, Shahid Chamran University of Ahwaz, Ahwaz, Iran

Abstract

Drought is a natural disaster which could be repeated, and cause damages in all climates. In Iran, drought has occurred frequently and caused water shortages in different sectors. Fars province geographical location is in the western sought of Iran. Due to the increases cities, villages, industrial and agricultural centers in this province, drought assessment is an urgent need. In this research Z score, Percentage of Normal Precipitation Index (PNPI), Decades of Precipitation Index (DPI), Rainfall Anomaly Index (RAI) and standard precipitation Index (SPI) were evaluated and and compared. Statistical analysis of precipitation showed a stable condition in Doroudzan Dam station and unstable conditions in Lar, Lamerd and Abadeh. Precipitation had a wide variation except in Shiraz, Zarghan and Doroudzan Dam stations, which verifies dominant drought climates in Fars. In order to determine the best index, minimum of rainfall and indicies correlation were used in this study. Results showed that PNPI-Z ,PNPI-SPI SPI-RAI, SPI-Z RAI-Z and PNPI-RAI indices are the most correlated ones, and DPI-SPI , DPI-RAI ,DPI-Z ,DPI-PNPI indices have week correlation. 1 and 12 months average indices showed the most correlation. The results showed that the PNPI, SPI and Z coincided with the date of minimal rainfall, and reported a severe drought in the study stations, therefore they are more efficient than the other indices to determine meteorological drought.

Keywords

Main Subjects

References

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Iranian journal of Ecohydrology
Volume 10, Issue 4
January 2024
Pages 575-593

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History

  • Receive Date: 23 May 2023
  • Revise Date: 24 August 2023
  • Accept Date: 24 October 2023
  • First Publish Date: 13 February 2024
  • Publish Date: 15 March 2024

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