Determination of drought using De Martonne-Gottman and Standardized Precipitation Index methods: A case study in Isparta province

Abstract

Drought is a concept that expresses the lack of moisture in the soil, precipitation deficiency or periods of no precipitation in a certain period. Different drought indices have been used to determine the temporal and spatial characteristics of drought. The aim of this study is to determine the drought in Isparta province by using De Martonne-Gottman and Standardized Precipitation Index (SPI) methods from drought indices. For this, 31-year (1990-2020) precipitation and temperature data from Atabey, Eğirdir, Isparta (Center), Senirkent, Uluborlu and Yalvaç State Meteorology Stations were used. As a result of the evaluations were made according to the De Martonne-Gottman method, it was determined that Senirkent district has “Semi-Humid” climate type while it was determined that the areas belonging to the districts such as Atabey, Eğirdir, Isparta (Center), Uluborlu and Yalvaç have the “Step (Semi-Arid)- Humid” climate type. In addition, the severity, size and distribution of the dry and rainy periods in the area and 1, 3, 6, 9 and 12-month SPI values were determined by using monthly precipitation data according to the SPI of the study area. Near-normal drought periods were encountered throughout the study area. Considering the 12-month SPI values, the period that the drought lasts the longest has been determined as 67 months (September 2004 - March 2010) in Yalvaç district. When the drought occurrence percentages for the 12-month SPI values are examined, it was determined that the highest percentage was Isparta (Center) with 52.3%.

Keywords

• drought
• de martonne-gottman
• standardized precipitation index
• isparta
• kuraklık
• de martonne-gottman
• standart yağış indeksi
• isparta