Trend Analysis of Precipitation Datas Observed for Many Years (1970-2019) in Niğde Center and Ulukisla District of Turkey

Abstract

This research situated in Turkey's Anatolia region, Nigde center and Ulukışla district were conducted. Long annual precipitation data were subjected to statistical analysis on a monthly basis. Within the scope of the research, 50 years and 600 months long total monthly precipitation and maximum monthly precipitation values between 1970-2019 were examined. Spearman Rho test, Mann-Kendall Correlation test and Sen's slope methods were used in trend analysis. According to the total precipitation values; The highest total precipitation was observed in 2009 as 460,8 mm. The lowest total precipitation was calculated as 192,9 mm in 1973. Total rainfall average was calculated as 120,5 mm in spring and 98,4 mm in winter. The total rainfall average in the summer months was determined as 38,2 mm. In general, the average total precipitation for many years in the center of Niğde was found to be 325,9 mm. The highest total precipitation in Ulukışla district was determined as 428,2 mm in 1997. The lowest total precipitation for many years was 182,1 mm in 1989. The average total precipitation for long years was determined to be 318,5 mm. Total rainfall average was determined as 132,8 mm in spring and 80,7 mm in winter. Total rainfall average in the summer months was calculated as 42,4 mm. According to the trend analysis results; It is concluded that there is no significant trend in total precipitation values for many years in the center of Niğde and Ulukışla district. The maximum annual precipitation in the center of Niğde is calculated as 10,5 mm and in the Ulukışla district as 10,3 mm. The average maximum precipitation in spring was found to be 13,2 mm in the center of Niğde and 14 mm in the town of Ulukışla. The highest maximum precipitation was observed in 1978 in Niğde city center as 27 mm in winter. The highest maximum precipitation in Ulukışla district was found as 33,8 mm in 2003. According to the long annual maximum precipitation values; It has been determined that there is an increasing trend in Niğde center in the general average of winter, summer and all months. It is observed that there is an increasing trend in the Ulukışla district in the winter months and in general average.