EVALUATING THE USE OF SATELLITE OPTICAL DATA FOR MAPPING AND MONITORING LAKES AND THEIR SALINITY IN KONYA AND BURDUR CLOSED BASINS SUBJECTED TO INCREASING WATER ABSTRACTION AND CLIMATE CHANGE

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2022-12-12

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Çolak, Mehmet Arda

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Global warming and climate change have been affecting the conditions and future of inland waters. Turkey's important two closed basins, Konya, and Burdur Closed Basins (KCB and BCB) are facing with drought and many of the lakes in these basins are drying or already dried out. Monitoring the lakes and mapping lake parameters (e.g., surface water area, electrical conductivity - EC) are important to increase the awareness about the situation of these lakes. Modified Normalized Difference Water Index (MNDWI) is used to map the surface area of the lakes from Landsat 5-8 and Sentinel-2 data. Sentinel-2 has better areal mapping due to its ground resolution advantage over Landsat-8. On the other hand, Landsat legacy provides great opportunity to monitor the lakes since 1984. Using this legacy, several lakes in KCB and BCB are monitored over the past 35 years. Combining these changes with the meteorological parameters, like Standardized Precipitation Evapotranspiration Index (SPEI), it is showed that the change in the surface area is related to the change in precipitation and evaporation. In addition, budget calculations showed that, Lake Burdur will reach the critical water level in the next 60 years and face with the possibility of dried out if the water use in the basin remains the same. Water EC is another important parameter for the lakes because it is related with the biodiversity. To map the EC of lakes, field measurements were used which were collected from the lakes in June 2020, July 2021 and May 2022. A significant relation between Sentinel bands 1, 2 and 3 with the EC values were obtained. Also, a case study conducted on Lake Salda presents the uniform variation of EC over the lake except at the locations of river contributing to the lake.

Subject Keywords

optical remote sensing, Sentinel-2, Landsat, water index, salinity

URI

https://hdl.handle.net/11511/102016

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

M. A. Çolak, “EVALUATING THE USE OF SATELLITE OPTICAL DATA FOR MAPPING AND MONITORING LAKES AND THEIR SALINITY IN KONYA AND BURDUR CLOSED BASINS SUBJECTED TO INCREASING WATER ABSTRACTION AND CLIMATE CHANGE,” M.S. - Master of Science, Middle East Technical University, 2022.