Relationship Between Water Level Change and Satellite Derived Bathymetry in Lakes

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Erkoç M. H.

3rd International Conference on Engineering and Applied Natural Sciences ICEANS 2023, Konya, Turkey, 14 - 17 January 2023, pp.251

  • Publication Type: Conference Paper / Summary Text
  • City: Konya
  • Country: Turkey
  • Page Numbers: pp.251
  • Yıldız Technical University Affiliated: Yes


Lake water levels change due to many reasons such as climate change, tectonism, erosions, and use in field irrigation. Especially, monitoring of climate change indicators and lake water levels due to the effect of global warming is important for the sustainability of lakes. With climate change and the decrease in water, the lake area is also shrinking. This shrinkage (water withdrawal) in the lake area reaches the bottom of the lakes and the depth of the lake changes. In this study, it is aimed to determine how the decreasing water level in the lake affects the depth of the lake and whether there is a relationship between them. For this purpose, Beyşehir Lake, located in the inner parts of Turkey, was chosen as the study area. Firstly, the change in the water level of Beyşehir Lake for the years 2015-2020 was determined from the satellite altimeter data. Then, Satellite Derived Bathymetry values were obtained by processing Sentinel-2 high resolution multi spectral satellite images in the same time period with the European Space Agency's SNAP software. According to the analysis, a decrease of 1.32 meters was determined in the lake water, and also the average depth of the lake decreased by about 5 meters. A high correlation of 92% was found between the lake level decrease and the average lake depth between the years 2015-2022.