COSPAR 44th General Assembly, Athens, Greece, 16 - 24 July 2022, pp.1
Monitoring the effects of climate change has become easier with the development of space techniques. Satellite Altimetry developed as an alternative to the determination of lake levels obtained with in-situ data when Topex/Poseidon was reached into orbit in 1992. With the suggestion by Gao (1996) and McFeeters (1996), remote sensing methods have started to be used in water bodies studies (McFeeters, S. K., 1996; Gao, B. C., 1996). In this study, it is aimed to determine water level change and water bodies map according to years due to climate change in Beyşehir Lake which is the third largest lake of Turkey. For this purpose, first of all, SPI indexes were determined with the help of meteorological data in order to determine whether there is a long-term drought in the region. Upon the determination of the increasing air temperature in the region, the water change between the years 2008-2021 was examined by using the Jason2 and Jason3 data of the water level of Beyşehir Lake. Upon the determination of serious water level decrease in some years, NDWI and MNDWI indexes were calculated by using Sentinel-2 data between 2015 and 2015, and the change of water bodies according to years was monitored. It has been determined that the water level in the lake and its surroundings reached the highest level in 2020, starting from 2015, and a shrinkage in the lake was determined.