International Journal of Environmental Science and Research

International Journal of Environmental Science and Research

Assessing Climate Change by Comparing Precipitation Indices (Case study: Dezful-Andimeshk Plain)

Document Type : Original Article

Authors
1 Department of Marine Geology, Faculty of Marine Natural Resources, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran.
2 Department of Marine Geology, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran
Abstract
Analysis of climate change by precipitation indices can help management of water resources and environmental planning. Meteorological parameters affect surface runoffs, river discharges, soil erosion, and water resources. Given the climatic conditions of Iran Plateau, occurrence of drought is inevitable in Andimeshk-Dezful plain, southwest Iran. The purpose of this research is to examine the climate change condition of the plain using the indices of SPI, SIAP, PNPI, RAI and moving average. The precipitation data of Safiabad and Dezful synoptic stations have been used for the analysis. After the homogeneity of the data has been explored by Runs test, they have been analyzed by the indices to examine the drought condition of the region. The results by the five indices have revealed normal state of drought in the study area. The results found that there is the highest similarity between the results of two indices of PNPI and RAI. The five indices have confirmed that the year 2005 has the highest drought condition and the year 2007 the highest wet condition in the period (2000-2020). According to SPI, PNPI, and RAI, the highest frequency of the events is related to normal droughts. It can be concluded that the beginning years of the period experienced drought. The study has also indicated that in reality the outcomes of SPI index are more accurate than those of other indices.
Keywords

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