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Title: HARMONICAL ANALYSIS OF SEA LEVEL DATA AT VARNA TIDE GAUGE
HARMONICAL ANALYSIS OF SEA LEVEL DATA AT VARNA TIDE GAUGE

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Anton Ivanov
10.5593/sgem2023/2.1/s09.26
10.5593/sgem2023/2.1
1314-2704
978-619-7603-57-6
English
23
2.1
•    Prof. DSc. Oleksandr Trofymchuk, UKRAINE 
•    Prof. Dr. hab. oec. Baiba Rivza, LATVIA
Geodesy and Mine Surveying
This article outlines time series analysis of sea level data from Varna tide gauge stations, to solve for short and long term sea level variations. The period of observations span to 1928 – 2022. Monthly sea level data were processed using a linear regression model includes mean sea level, trend, annual, semiannual and decadal variations. Analysis of monthly sea level data for period 1928-2022 clearly indicates annual and decadal variations of mean sea level. Hourly sea level data of radar tide gauge include the period May 2013 - December 2022. The period is enough for separation the influence of long from short term tidal constituents. To analyzing of hourly sea level data, a harmonic analysis with least squares was used to resolve the amplitudes and phases of the tidal components. Harmonic analysis described observed data like series presented by sum of components whit a previously known frequencies stable in time. More than sixty statistically significant short term tidal constituents are obtained. Observation of the mean sea level is an important not only from an changing climate point of view, it also plays an key role in geodesy and geophysics. The results obtained for the annual and semi-annual tides from the regression analysis of monthly sea level and the harmonic analysis of hourly sea level data are compared.
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Present work is supported by Contract No D01-164/28.07.2022 (Project "National Geoinformation Center (NGIC)" financed by the National Roadmap for Scientific Infrastructure 2020-2027 of Bulgaria.
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https://doi.org/10.5593/sgem2023/2.1/s09.26
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Proceedings of 23rd International Multidisciplinary Scientific GeoConference SGEM 2023
23rd International Multidisciplinary Scientific GeoConference SGEM 2023, 03 - 09 July, 2023
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference SGEM
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci and Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts and Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci and Arts; Acad Sci Moldova; Montenegrin Acad Sci and Arts; Georgian Acad Sci; Acad Fine Arts and Design Bratislava; Russian Acad Arts; Turkish Acad Sci.
209-214
03 - 09 July, 2023
website
9106
mean sea level, harmonic analysis, tidal constituents