| dc.description.abstract | Abstract :
Sixty four years, 1952-2016, rainfall data (monthly rainfall and annual total rainfall)
were analyzed using non-parametric methods like Mann-Kendall and Sen’s T test to
detect the recent trends in rainfall pattern over seven divisions of Bangladesh. Sen’s non-
parametric estimator of slope was frequently used to estimate the magnitude of trend,
whose statistical significance was assessed by the Mann-Kendall test. Station basis
trend analysis was performed for rainfall data. For rainfall of Bangladesh most of the
stations, viz. Dhaka, Sylhet, Rangpur, Khulna showed significant upward trend. There
were rising rates of rainfall in some months such as April in Rangpur and September
in Khulna and a decreasing trend in some other months as in January in Sylhet were
obtained by these statistical tests suggested overall significant changes in rainfall trend
in these areas. Monthly rainfall and annual total rainfall were found to decrease at the
rates of 4.94 mm/year and 16.11 mm/year, respectively, where the downward trend
of monthly total rainfall was insignificant but the trend of annual total rainfall was
significant with 5% level of significance. | en_US |
