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2 2014

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Adjustment of the European Vertical Reference System for the representation of the Baltic Sea water surface topography

Wiśniewski B., Wolski T., Giza A.

Zeszyty Naukowe / Akademia Morska w Szczecinie

2014

nr 38 (110)

106--117

Reference system was adapted EVRS (European Vertical Reference System), which is based on the level of NAP (Normal Amsterdam Peil) for the spatial imaging extreme levels of the Baltic Sea. The observational data on sea levels have been converted of the selected 38 stations in each of the Baltic countries to the level of NAP (Normal Amsterdam Peil). The images of the Baltic Sea area were obtained in a uniform reference system, for the example of chosen stormy situation of 1–2 November 2006, and the spatial distribution of the maximum and no maximum sea levels that occurred during the 1960–2010 year.

Extreme sea levels at selected stations on the Baltic Sea coast

Wolski T., Wiśniewski B., Giza A., Kowalewska-Kalkowska H., Boman H., Grabbi-Kaiv S., Hammarklint T., Holfort J., Lydeikaite Ž.

Oceanologia

2014

No. 56 (2)

259--290

The purpose of this article is to analyse and describe the extreme characteristics of the water levels and illustrate them as the topography of the sea surface along the whole Baltic Sea coast. The general pattern is to show the maxima and minima of Baltic Sea water levels and the extent of their variations in the period from 1960 to 2010. A probability analysis is carried out on the annual sea level maxima and minima for 31 water level gauges in order to define the probability of occurrence of theoretical sea levels once in a specific number of years. The spatial distribution of sea levels for hundred-year maximum and minimum water levels is illustrated. Then, the number of storm surges for the accepted criteria are presented: these numbers increased in the 50-year period analysed. The final part of the work analyses some extreme storm events and calculates the static value and dynamic deformation of the sea surface by mesoscale, deep low-pressure systems.