In English. Summaries in Estonian

Proceedings of the Estonian Academy of Sciences.



Volume 7 No. 3 September 2001


Extreme wind speeds and spatially uniform wind events in the Baltic Proper; 195–211

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Abstract. It is shown that Vilsandi wind data represent satisfactorily both scalar and directional properties of the wind regime in the Baltic Proper. Angular distribution of the wind speed in extreme wind events (based on the Weibull distribution) has a specific two-peaked shape with maxima corresponding to south-west and north winds, and a deep minimum for eastearly winds. Extensive periods in which wind direction is uniform over large areas, frequently occur in the Baltic Proper. Both wind speed and direction may essentially change during such events, but the changes may occur synchronously at remote sites.

Key words: wind dynamics, extreme wind speed, Baltic Sea meteorology.

Seasonal wind stability on the West Estonian coast; 212–221

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Teolan TOMSON and Maire HANSEN

Abstract. Two characteristic seasons can be distinguished in the winds prevailing in Estonia: winter and summer. Summer is characterized by a periodical daily wind component at the coast as well as on the mainland. Filtering it out from the time series, the rest of the data can be considered as the random component of the wind velocity. The length of its correlation interval, about 10 h, determines the stability of the wind velocity. It is shown that data obtained at the height of 10–12 m with a 3-h step is sufficient to establish the correlation interval. The average value of the wind velocity and its correlation interval depend more strongly on the season than on the location.

Key words: wind velocity, random component, correlation interval.

Hydrodynamical modelling of sea levels in the Väinameri and Pärnu Bay; 222–234

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Abstract. Using a 2D hydrodynamic model, water level in the Väinameri and in the northern part of the Gulf of Riga is investigated on the basis of data from 1999. Comparison of the modelling results with measurement data shows that the model can be applied in describing and predicting both the high water levels (storm surges) in the Pärnu Bay and the low levels (which often disturb navigation) in the Väinameri.

Key words: Baltic Sea, sea level, hydrodynamical modelling, 2D models, storm surges.

Heat energy and water consumption in apartment buildings; 235–241

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Teet-Andrus KÕIV and Alvar TOODE

Abstract. Specific heat energy consumption for space and water heating in typical apartment buildings in Tallinn is described. Hot and cold water consumption data is presented and energy conservation measures in apartment buildings are considered.

Key words: heat energy consumption, water consumption, energy conservation.



Arvo Ots 70; 242



Ilmar Öpik; 244