Trend Analysis of Extreme Precipitation Indices for 1964-2019 Period: a Case Study Beysehir Sub-Basin

Abstract

Changes in the severity of extreme climate events caused by global climate change adversely affect human life, nature, living things and the economy. One of the most important effects of climate change is the change in the precipitation regime. While the lack of precipitation in a region leads to drought and the heavy rain leads to flooding. Therefore, it is important to determine changes in the precipitation regime in order to protect soil and water resources. In this study, extreme precipitation indices (R1mm, R10mm, R20mm, RX1day, RX5day, CDD, CWD, SDII) were used to examine the temporal changes of precipitation in two meteorological stations (Beysehir and Seydisehir) located in the Beyşehir SubBasin in the Konya Closed Basin. Mann-Kendall (MK) and Innovative Şen Trend (IŞT) tests were used to analyze these indices. The obtained results show that there is no statistically significant trend in the extreme precipitation indices of the two stations in general. A significant decreasing trend was found in CDD index only for Beyşehir Station.