Ecology, Environment and Conservation Paper

Vol. 19, Issue 02, 2013; Page No.(551-558)

AN INVESTIGATION ON THE RAINFALL TREND IN MONTHLY, SEASONAL AND ANNUAL SCALE (CASE STUDY: ESFAHAN PROVINCE)

Ghorban Vahabzadeh, Pezhman Allahbakhshian Farsani, and Reza Zamani Ahmad Mahmoodi

Abstract

Continental variations highly impact on hydrological cycle and hence water resources, redundancy and intensity of drought and overflow in natural environment, society and economy. So it is necessary to evaluate of the variation in temporal and spatial patterns in order to water management strategies. This study has been done in Esfahan province in 26 rainfall gauging stations on 1979-2009 monthly, seasonal and annual scale. There were no station showed significant trend up to 95% and 99% in annual rainfall and also downward trend in Winter and upward trend in Summer in amount of rainfall observed. Around 20% of stations have significant downward trend up to 95% and 99% in Mars. In Sarab Hande station downward trend observed up to 95% in november and February and 99% in March. The aim of this study is to determine the annual, seasonal and monthly trend.

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