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The paper outlines time series analysis of tide gauge data to solve for short and long term sea level variations at the Varna tide gauge station. The data covered the period 1928 ? 2018. The measurements have started at 1928 using mechanical floating tide gauge type A. Ott-Kempten. In 2013 a radar tide gauge type Vega Plus with web interface was installed. Linear regression model was applied analyzing monthly registration for computing mean sea level, trend, annual, semiannual and decadal variations. Analysis of t...