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Title: INVESTIGATING THE SPATIAL AND TEMPORAL DISTRIBUTION OF DROUGHT TREND IN IRAN

Author: H. Malekinezhad

Year: 2009

Publisher: European Water Resources Association (EWRA)

Description:

Drought is a normal and repeatable climatic phenomenon. The prediction of spatial and temporal distribution of drought attributes is one of the main aspects of water resources management, especially in arid and semiarid regions. More than 75% of Iran is located at such climatic conditions. In recent years, due to drought, very severe economical and agricultural damages were occurred in Iran. The drought analysis indices are common applied for assessing the frequency and severity of dry and wet periods in each region. In this study, using some
attributes and indices the drought trends in Iran is investigated and its spatial and temporal distribution during the last 5 decades is compared over the whole country. The 49-year precipitation data of 21 weather stations were provided to analyze the temporal and spatial variations of drought in northern and southern Iran. Iran is a vast country and is affected by northern, Mediterranean, Sudanian and Indian Ocean fronts. Due to this state, the severity and frequency of drought in different part of the country is not the same. The standard precipitation index
and 5-year and 7-year moving average were used to assess the drought in the study area. The results represents several wet and dry periods at the selected stations. The analysis of data for some identified dry and wet periods shows the occurrence of different severity and frequency of drought in northern and southern Iran.