TY - JOUR ID - 7862 TI - ComparabilityAnalyses of the SPI and RDI Meteorological Drought Indices in South Khorasan Province in Iran JO - International Journal of Advanced Biological and Biomedical Research JA - IJABBR LA - en SN - 2383-2762 AU - Zehtabian, Gholamreza AU - Karimi, Kamran AU - Nakhaee nezhad fard, Sara AU - Mirdashtvan, Mahsa AU - Khosravi, Hassan AD - Professors, Faculty of Natural Resources, University of Tehran,Karaj, Iran AD - M.Sc. Student of Deserts Region Management, Faculty of Natural ResourcesUniversity of Tehran, Karaj, Iran AD - M.Sc. Student of Watershed Management engineering, Faculty of Natural ResourcesUniversity of Tehran, Karaj, Iran AD - AssistanceProfessors, Faculty of Natural Resources, University of Tehran ,Karaj, Iran Y1 - 2013 PY - 2013 VL - 1 IS - 9 SP - 981 EP - 992 KW - SPI KW - RDI KW - ArcGIS9.3 KW - Drought KW - South Khorasan DO - N2 - Comparability analyses are performed to investigate similarities/differences of the standard precipitation index (SPI) and the reconnaissance drought index (RDI), respectively, utilizing precipitation and ratio of precipitation over potential evapotranspiration (ET0). Data are from six synoptic stations in south Khorasan province in Iran.At the first for calculating SPI, the elevation-precipitation regression of each period was obtained then this relationship was applied on DEM layer using GIS software. The result showed that the most severity droughts occurred in 2008, 2000, 2006 and 2001 respectively. In order to obtain RDI index, we used yearly temperature, precipitation data from the stations and potential evapotranspiration were obtained by Torrentwhite method.  The resultshowed that 4 stations classified in extremely and severely classes and there was no medium and small class in 2008. The results of RDI indicate that the frequency of droughts with high severity in this area. The calculation of the standardized RDI seems to be as complicated as the computation of the SPI UR - https://www.ijabbr.com/article_7862.html L1 - https://www.ijabbr.com/article_7862_4415925a83d14ca9766e6d5e75d2ed4f.pdf ER -