The analysis of climatic variation and its impact on water resources in northern slopes of the Karkas

Document Type : scientific-research article

Authors

Dariush Rahimi

Marzieh Majd

https://doi.org/10.22067/geography.v9i17.14492

Abstract

From the viewpoint of many experts in climatology, climate fluctuation is considered a natural phenomenon repeated in the course of a long-term cycle. This study will analyze the elements of temperature, precipitation and evaporation in the northern mountains of the Karkas range in terms of seasonal and annual cycles, using a non-parametric test of Man-Kendall during two time periods from 1980 to 2009 and from 2007 to 1987. Based on the results, the data with a confidence level of 95% indicate that the days with a precipitation of over 10 mm especially during the winter suggest no certain trend. The years 1987-2007 indicate an increasing trend towards higher temperatures and evaporation compared to the period of 1980-2009, so that the annual averages and the maximum and minimum temperatures show a significant increasing trend, but no trend of precipitation or evaporation is seen. The regression line of evaporation, however, showed an increase of 2 to 16 millimeters per year, a process suggesting increased water demands, reduced soil moisture, decrease in pastures and agricultural products, and exerting more pressure on underground water resources.

Keywords

Climate change

Man–Kendall test

the Karkas range

trends in temperature and precipitation

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