Abstract:

Dryness is a concept that expresses the lack of moisture in the soil, insufficient rains or periods without rains in a certain period of time. Different drought indicators are used to determine the temporary and alansal characteristics of drought. The aim of this study is to determine the drought in the province of Isparta using the De Martonne-Gottman and the Standard Rain Index methods. For this, 31 years (1990-2020) rain and temperature data from Atabey, Eğirdir, Isparta (Central), Senirkent, Uluborlu and Yalvaç State Meteorological Stations have been used. According to the De Martonne-Gottman method, the results of the evaluations are found that the Atabey, Eğirdir, Isparta (Central), Uluborlu and Yalvaç districts are in the climate type between "Step (Semi-Dry)-Nemli", while the Senirkent district is in the "Semi-Dry" climate type. However, according to the SYI of the study area, using monthly rainfall data, the 1, 3, 6, 9 and 12 monthly SYI values and the severity, size and distribution of the dry and rain periods in the area were identified. In the area of the study, it was seen with near-normal periods of drought. Given the 12 month values, the longest period of drought was determined as 67 months (September 2004 - March 2010) in Yalvaç district. For the 12 month SYI values, when the drought formation percentage was studied, the highest rate was found in Isparta (Central) with 52.3%.

Keywords: