Droughts analysis in the Northeast of Iran using Joint Deficit Index (JDI)

Document Type : Research Article

Authors

1 Assistant Professor, Water Engineering Department, Shahrekord University, Shahrekord, Iran

2 PhD Candidate of Water Resources Engineering, Shahid Chamran University, Ahvaz, Iran

3 MSc. Graduate, West Azarbaijan Regional Water Authority, Urmia, Iran

4 PhD Candidate of Water Resources Engineering, Birjand University, Birjand, Iran

Abstract

Monitoring and prediction of droughts, especially accurate determination of its start time and duration, is very important in water resources management and planning drought mitigation strategies. In this study, drought conditions in the Northeast of Iran was evaluated by means of Joint Deficit Index (JDI). Monthly precipitation data from 6 synoptic stations including Torbat Heydariyeh, Sabzevar, Semnan, Shahroud, Gorgan and Mashhad during the period of 1971 to 2011 were used for calculating the JDI index. Results showed that in recent years the number of dry months across study area (especially at wet regions) increased, significantly. As in all of considered stations (except Semnan station), the percentage of dry months increased to over (more than) 50% over the past 10 years (2002-2011). Results showed that the JDI provides a comprehensive assessment of droughts and it is capable of reflecting both emerging and prolonged droughts in an accurate manner and allows for a month-by-month drought assessment.

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Volume 4, Issue 2
June 2017
Pages 573-585
  • Receive Date: 30 December 2016
  • Revise Date: 25 January 2017
  • Accept Date: 18 February 2017
  • First Publish Date: 22 June 2017