9447

8729

كارشناسي ارشد

كشاورزي - آبياري و زهكشي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1393

پانزده،125ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

سعيد اسلاميان

اسماعيل لندي، حسين سقاييان نژاد

16/10/93

شمس اله ايوبي، محمد مهدي مجيدي

مهندسي كشاورزي

ID8729

126 Development of Some Drought Indices for Isfahan Province Mohammad Esmaeil Naseri m naseri@ag iut ac ir September 14 2014 Department of Water Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Seyed Saeid Eslamian saeid@cc iut ac ir Abstract Drought is one of the repetitive natural disasters that can be happened in each region This event may damage the different parts of places severely The most important factor in the occurrence of drought is lack of rainfall compared with the normal condition also the evapotranspiration adds to its intensity Therefore in this study four proposed drought indices which are based on precipitation and evapotranspiration of reference data were used in scales of 3 6 and 12 months from winter in Isfahan province These indices are the standard values of Ratio of Precipitation to Evapotranspiration Index RPEI Ratio of Precipitation to Precipitation Deficit Index RPPDI Precipitation Deficit Index PDI and Evapotranspiration Index ETI The Penman Monteith FAO method as a standard method is used for calculating reference evapotranspiration In order to comparing the indices results four indices are compared with the Standardized Precipitation Index SPI in Similar scales The results showed that the ETI as a simple function of evapotranspiration has the least accommodation with SPI based on events like drought wet or normal conditions Therefore evapotranspiration is an important factor affecting the Isfahan province but way of including in the equation is very significant Two indices RPEI and RPPDI have more accommodation with SPI These two indices have low sensitivity with evapotranspiration changes PDI the standardized difference between precipitation and evapotranspiration located in intermediate conditions Frequency analysis of the RPE Ratio of Precipitation to Evapotranspiration showed Daran and Khoorobiabanak have the wettest and driest climate between other stations The result of zoning of relative percent drought frequency due to RPEI index showed that in general in east northeast and small portion regions of Isfahan province more droughts occurs and thus these areas are more sensitive and need the most manipulating Keywords Drought index evapotranspiration frequency analysis Isfahan province

سعيد اسلاميان

اسماعيل لندي، حسين سقاييان نژاد

شمس اله ايوبي، محمد مهدي مجيدي