Investigation of PCI Drought Index and Its Trend Over Iran in The Recent Half Century
Precipitation is one of most the important parameters of climate that affects water resources directly. In this research changes of precipitation pattern in Iran investigated by means of PCI index. In this order 25 synoptic stations of Iran during two periods of 1961-1986 and 1986-2010 used to calcu...
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| Format: | Article |
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Shahid Chamran University of Ahvaz
2016-10-01
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| Series: | علوم و مهندسی آبیاری |
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| Online Access: | http://jise.scu.ac.ir/article_12356_a39ad0871ca1932e2e33ad9020c47f02.pdf |
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| author | Keyvan Khalili Mohammad Nazeri Tahrodi ALi Reza Moghadam nia Mojtaba Moravej Marziye Abbas zadeh Afshar |
| author_facet | Keyvan Khalili Mohammad Nazeri Tahrodi ALi Reza Moghadam nia Mojtaba Moravej Marziye Abbas zadeh Afshar |
| author_sort | Keyvan Khalili |
| collection | DOAJ |
| description | Precipitation is one of most the important parameters of climate that affects water resources directly. In this research changes of precipitation pattern in Iran investigated by means of PCI index. In this order 25 synoptic stations of Iran during two periods of 1961-1986 and 1986-2010 used to calculate PCI index and then significance of this index evaluated by t-test method. Results of mapping this index over Iran showed that precipitation changes had the same pattern in the two studied periods of time. Also results indicated that PCI index was high in the central part of Iran and in the low-precipitation provinces such as Kerman, Hormozgan, Yazd, Zahedan, Shahrekord, Birjand, Booshehr, Ahwaz and Isfahan. These stations according to the Oliver (1980) classification showed high irregular precipitation pattern. According to the results most parts of northwest followed irregular precipitation pattern. Two stations of Rasht and Gorgan had intermediate PCI index values and Zanjan and Tabriz stations had almost intermediate PCI index values. In none of stations uniform precipitation pattern (PCI<10) found. Finally trend of PCI index analyzed in the regional and stational scales and non-significant upward trend detected at 5% level at clusters 2 and 5 while in other clusters non-significant downward trend observed. |
| first_indexed | 2024-12-19T03:12:24Z |
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| id | doaj.art-98565ff739a647c49a71c511880c2dad |
| institution | Directory Open Access Journal |
| issn | 2588-5952 2588-5960 |
| language | fas |
| last_indexed | 2024-12-19T03:12:24Z |
| publishDate | 2016-10-01 |
| publisher | Shahid Chamran University of Ahvaz |
| record_format | Article |
| series | علوم و مهندسی آبیاری |
| spelling | doaj.art-98565ff739a647c49a71c511880c2dad2022-12-21T20:37:59ZfasShahid Chamran University of Ahvazعلوم و مهندسی آبیاری2588-59522588-59602016-10-0139319520710.22055/jise.2016.1235612356Investigation of PCI Drought Index and Its Trend Over Iran in The Recent Half CenturyKeyvan Khalili0Mohammad Nazeri Tahrodi1ALi Reza Moghadam nia2Mojtaba Moravej3Marziye Abbas zadeh Afshar4استادیار گروه مهندسی آب، دانشگاه ارومیهدانشجوی دکتری منابع آب، دانشگاه بیرجنددانشیار گروه کشاورزی و منابع طبیعی دانشگاه تهراندانشجوی دکتری منابع آب دانشگاه تهراندانشجوی کارشناسی ارشد منابع آب، دانشگاه ارومیهPrecipitation is one of most the important parameters of climate that affects water resources directly. In this research changes of precipitation pattern in Iran investigated by means of PCI index. In this order 25 synoptic stations of Iran during two periods of 1961-1986 and 1986-2010 used to calculate PCI index and then significance of this index evaluated by t-test method. Results of mapping this index over Iran showed that precipitation changes had the same pattern in the two studied periods of time. Also results indicated that PCI index was high in the central part of Iran and in the low-precipitation provinces such as Kerman, Hormozgan, Yazd, Zahedan, Shahrekord, Birjand, Booshehr, Ahwaz and Isfahan. These stations according to the Oliver (1980) classification showed high irregular precipitation pattern. According to the results most parts of northwest followed irregular precipitation pattern. Two stations of Rasht and Gorgan had intermediate PCI index values and Zanjan and Tabriz stations had almost intermediate PCI index values. In none of stations uniform precipitation pattern (PCI<10) found. Finally trend of PCI index analyzed in the regional and stational scales and non-significant upward trend detected at 5% level at clusters 2 and 5 while in other clusters non-significant downward trend observed.http://jise.scu.ac.ir/article_12356_a39ad0871ca1932e2e33ad9020c47f02.pdfprecipitation patternfuzzy classificationpci indexregional kendall |
| spellingShingle | Keyvan Khalili Mohammad Nazeri Tahrodi ALi Reza Moghadam nia Mojtaba Moravej Marziye Abbas zadeh Afshar Investigation of PCI Drought Index and Its Trend Over Iran in The Recent Half Century علوم و مهندسی آبیاری precipitation pattern fuzzy classification pci index regional kendall |
| title | Investigation of PCI Drought Index and Its Trend Over Iran in The Recent Half Century |
| title_full | Investigation of PCI Drought Index and Its Trend Over Iran in The Recent Half Century |
| title_fullStr | Investigation of PCI Drought Index and Its Trend Over Iran in The Recent Half Century |
| title_full_unstemmed | Investigation of PCI Drought Index and Its Trend Over Iran in The Recent Half Century |
| title_short | Investigation of PCI Drought Index and Its Trend Over Iran in The Recent Half Century |
| title_sort | investigation of pci drought index and its trend over iran in the recent half century |
| topic | precipitation pattern fuzzy classification pci index regional kendall |
| url | http://jise.scu.ac.ir/article_12356_a39ad0871ca1932e2e33ad9020c47f02.pdf |
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