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ANALYSIS OF SEA LEVEL DATA AT VARNA AND BURGAS TIDE GAUGE STATIONS
Abstract
There is observational evidence that the global sea levels are rising and increasing the risk to coastal communities from floods and erosion. Interest in marine sea level research is determine not only by forecasting cataclysms and sea level rising, but also in connection with interdisciplinary studies exploring the causes of this change. The article outlines time series analysis of tide gauge data to solve for short and long-term sea level variations at Varna and Burgas tide gauge stations. The data covered the period 1928 ? 2019 for Varna, and 1928 ? 2017 for tide gauge station Burgas. Data include values from both analogue and radar measurements corrected for subsidence of the tide gauge staff. Regression model is applied to analyze monthly sea level data for computing mean sea level, trend, annual, semiannual and decadal variations. The analysis of tide gauge data from two stations indicates annual and decadal variations of mean sea level. Radar tide gauge?s data includes hourly values for period May 2013 ? December 2019 for Varna and June 2013 ? April 2017 for Burgas site. This observation period is sufficient for separation long- from short-term tidal constituents. Least-squares harmonic analysis is used to solve for amplitudes and phases of tidal constituents. The method is based on the theory that observed data series can be presented by sum of components with previously known frequencies, stable in time. Over 60 statistically significant short-term tidal constituents are obtained from both tide gauge stations. The annual and semiannual tidal amplitudes and phases, estimated with harmonic analysis and regression model, are compared for both stations.
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References2
Ivanov A., Georgiev I., Dimitrov N. (2019). Analysis of 90 years sea level data at Varna tide gauge station. 19th International Multidisciplinary Scientific GeoConference SGEM 2019. 9.Geodesy and Mine Surveying. Book 2.2. pp11-16, ISSN 1314-2704, DOI: 10.5593/sgem2019/2.2/S09.002
Ivanov A., Georgiev I., Dimitrov N. (2019). Single spectrum analysis for monthly sea level data from Varna tide gauge station. 10th Congress of Balkan Geophysical Society, 18-22 September 2019, Albena Resort, Bulgaria. 1.2 Marine Geophysics. DOI: 10.3997/2214-4609.201902664
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