Hydrological Drought Assessment in Northwestern Iran Based on Streamflow Drought Index (SDI)

Drought is a natural and worldwide phenomenon that occurs when water availability is significantly below normal levels during a significant period of time and cannot meet demand

Hossein Tabari; Jaefar Nikbakht; P. Hosseinzadeh Talaee

2012

Scholarcy highlights

  • Drought is a natural and worldwide phenomenon that occurs when water availability is significantly below normal levels during a significant period of time and cannot meet demand
  • This work focused on the hydrologic drought defined by the streamflow drought index for overlapping periods of 3, 6, 9 and 12 months at 14 hydrometric stations in the northwest of Iran over the period 1975–2009
  • The ability of the log-normal, exponential and uniform probability distributions was examined in order to choose the most suitable distribution, and the log-normal distribution was used to fit the long-term streamflow data
  • The results of the hydrological drought analysis based on the SDI showed that almost all the stations suffered from extreme droughts during the study period
  • Extreme droughts occurred most frequently in the last 12 years from 1997–1998 to 2008–2009

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