Evaluation of wet and dry event's trend and instability based on the meteorological drought index.

As a result, residuals from HHT showed the increasing trend for the year 1981 and a decreasing trend for the year 1961 to 1980.

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Introduction In recent decades, the climate changes tend to increase the occurrence and intensity of natural perils such as heavy rainfall, flood, forest fires and droughts that indicate an increasing trend ( Estrela & Vargas, 2012 ; Kreibich et al., 2017 ; Masud, Qian & Faramarzi, 2020 ).

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