39. XXXIV МЕЖДУНАРОДЕН СИМПОЗИУМ СЪВРЕМЕННИТЕ ТЕХНОЛОГИИ, ОБРАЗОВАНИЕТО И ПРОФЕСИОНАЛНАТА ПРАКТИКА В ГЕОДЕЗИЯТА И СВЪРЗАНИТЕ С НЕЯ ОБЛАСТИ София, 06 – 08 ноември 2024 г. –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– XXXIV INTERNATIONAL SYMPOSIUM ON MODERN TECHNOLOGIES, EDUCATION AND PROFESSIONAL PRACTICE IN GEODESY AND RELATED FIELDS Sofia, 06 – 08 November 2024
ASSESSMENT OF INLAND WATER BODY EXTENT USING SENTINEL 2 IMAGERY: AN EXAMPLE FROM THE BATAK RESERVOIR( WESTERN RHODOPES, BULGARIA)
Assoc. Prof. Dr. Emilia Tcherkezova, PhD Student Kalin Markov, Assoc. Prof. Dr. Marian Varbanov, Assistant Prof. Dr. Stefan Genchev
ОЦЕНКА НА ОБХВАТА НА ВЪТРЕШНОКОНТИНЕНТАЛНИ ВОДНИ ОБЕКТИ С ПОМОЩТА НА СПЪТНИКОВИ ИЗОБРАЖЕНИЯ ОТ SENTINEL 2 НА ПРИМЕРА НА ЯЗОВИР „ БАТАК“( ЗАПАДНИ РОДОПИ, БЪЛГАРИЯ)
Доц. д-р. Емилия Черкезова, Калин Марков, докторант, доц. д-р Мариан Върбанов,
гл. ас. д-р Стефан Генчев, НИГГГ, БАН
SUMMARY
Climate change and human activities significantly impact inland surface water bodies. Effective water use and resource management depend on accurate delineation of water body boundaries. The rapid development of geoinformation technologies over the past decades provides an opportunity to apply Geographic Information Systems( GIS) and remote sensing methods and techniques for water body delineation and for analysis their spatial and temporal dynamics.
This study utilizes Sentinel-2 optical satellite images to analyse the surface water area changes of the Batak Reservoir( Western Rhodopes, Bulgaria). The analysis covers two years in two seasons: November( 2022) and July( 2024). It includes the calculation of several water indices, e. g. Normalized Difference Water Index( NDWI), Sentinel Water Mask( SWM), Water Ratio Index( WRI), threshold methods, and Object-Based Image Analysis( OBIA).
The results were compared with in-situ investigation and open source data from the Bulgarian Ministry of Agriculture and Food. They provide valuable spatial information on changes in the Batak Reservoir area, which cannot be identified only by measuring its water levels. This highlights the usefulness and effectiveness of processing satellite imagery data, which can be applied to enhance the quality of existing data sets available from the East Aegean River Basin Directorate( Plovdiv). Also, the methodological approach used in this study can be applied for long-term monitoring of the spatial and temporal changes in the boundaries of the Batak Reservoir.
Keywords: Sentinel-2, water indices, thresholds method, Object-Based Image Analysis( OBIA), opensurface water body extent, Batak Reservoir, Western Rhodopes, Bulgaria.
РЕЗЮМЕ
Вътрешноконтиненталните повърхностни водни обекти са важни компоненти на хидросферата и водни екосистеми. Следователно установяването на техните граници и промени, вследствие на изменението на климата и антропогенните дейности има много важно
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