The purpose of this paper is to investigate the trend of precipitation in
Kilkis region (Greece) at the site and regional level in various time scales. At the site level, the precipitation trend was analyzed using three tests: 1)
Mann-Kendall, 2) Sen’s T and 3) Spearman while the trend slope was estimated
using the Sen’s estimator. At a regional
level, nonparametric spatial tests such as Regional Average Mann-Kendall
(RAMK) and BECD’s (Bootstrap Empirical Cumulative Distributions) were
elaborated with and without the effect of cross correlation. The trend of
precipitation was noticed generally downward at annual time scale and
statistically significant at 5% level of significance only in only one station.
The results of the analysis of trends at the regional level showed in total the influence of cross correlation in the
time series since the number of trends detected is reduced when cross
correlation is preserved. Precipitation data from 12 stations were used. The
study results benefit water resource
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