In this study, quality control of Antalya-I and Antalya-II Tide Gauge Stations was realized by scientific methods. Seasonal and long-term sea level variations were investigated by using hourly sea level information. Seasonal (for a year and for half a year) variations, average sea level and sea level velocity were calculated according to the least squares method, with an equation having a harmonic function mathematical model. Separate and joint information of Antalya-I and Antalya-II Tide Gauge Stations were analyzed. As a result, the average sea level velocity of Antalya-I (1935 - 1977) Tide Gauge Station was determined as 1.00 ± 0.3 mm/year and the average sea level speed of Antalya–II (1985-2005) Tide Gauge Station was determined as 4.4 ± 0.7 mm/year. According to calculations using joint information, an average sea level velocity for the 1935 - 2005 period was determined as 0.2 ± 0.1 mm/year.
Key words: Tide gauge station, sea level variations, tide, trend, harmonic analysis.
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