Akademik Veri Yönetim Sistemi
International Journal of Environment and Geoinformatics, cilt.10, sa.4, ss.56-63, 2023 (Hakemli Dergi)
The Strait of İstanbul (Bosphorus:SoI) is a narrow water passage connecting the Marmara and the Black Sea through a sea-level balance current flow. This study performs change-points in mean and variance and trend analysis to reveal whether the sea level changes. Moreover, simple and multiple linear regressions are calculated to explain the relationships among sea level data in the three stations located in the Black Sea, the Sea of Marmara, and the SoI. The Turkish National Sea Level Monitoring System (TUDES) measures the sea water level in three stations each 15 minutes, to minimize the effect of turbulence. The sea level in the coastal area of Istanbul is one of the most populous regions with high economic importance. The most important reason is the severe decrease in water discharged into the Black Sea due to dams and excessive water usage. The three sea level stations have no change-point on the average of the whole data. The change-points in variance are depicted especially on days when the data gap is filled with average data and in the 2018 year. While the difference in the sea level of the Istanbul and Sile stations contains no seasonality, the difference between the other stations has a sinusoidal component. While this study focuses on understanding the sea level characteristics of the SoI, it also emphasizes the importance of accuracy, completeness, and long-term measurement data requirements.