• Parvaneh Sobhani 1

  • Afshin Danehkar 2

  1. 1 Department of Environmental Science, Natural Resources Faculty, Lorestan University, Khorramabad, Iran
  2. 2 Department of Environmental Science, Natural Resources Faculty, University of Tehran, Karaj, Iran

Abstract

Understanding climate change trends, especially precipitation, has played a significant role in the hydrological cycle and the severity of recent droughts in the Mesopotamian Plain and other western and southwestern regions. In the present study, precipitation changes trend in western and southwestern Iran and the occurrence of droughts in the Mesopotamian Plain from 1989 to 2022 were investigated using the independent t-test in SPSS software, and analyzing statistical variables including mean, median, mode, standard deviation, coefficient of variation, range of variation, skewness, maximum, and minimum. The spatial distribution of annual rainfall has shown a noticeable downward trend, and rainfall in the country has become more concentrated and uniform in terms of time in recent years. The precipitation concentration index also showed that the highest index is related to the southwestern regions, and the lowest concentration index is assigned to the northern regions. Accordingly, the increase in the intensity of seasonality and concentration of precipitation in the southern parts indicates high variability and precipitation irregularity, as a result, an increase in the incidence of drought. The results obtained indicate a decreasing trend in annual and seasonal precipitation and, subsequently, an increase in the occurrence of droughts in the Mesopotamian Plain.

Keywords

Subjects

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