Engineering September 2001 Vol 7/3 []

CONTENTS & ABSTRACTS

InEnglish. Summaries in Estonian

Proceedings of the Estonian Academy of Sciences.

Engineering



Volume 7 No. 3September 2001



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

(full article in PDF format)

Tarmo SOOMERE

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

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

Seasonal wind stability on the West Estoniancoast; 212–221

(full article in PDF format)

Teolan TOMSON and Maire HANSEN

Abstract. Two characteristicseasons can be distinguished in the winds prevailing in Estonia: winter andsummer. Summer is characterized by a periodical daily wind component at thecoast as well as on the mainland. Filtering it out from the time series, therest of the data can be considered as the random component of the windvelocity. The length of its correlation interval, about 10 h, determinesthe stability of the wind velocity. It is shown that data obtained at theheight of 10–12 m with a 3-h step is sufficient to establish thecorrelation interval. The average value of the wind velocity and itscorrelation 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 theVäinameri and Pärnu Bay; 222–234

(full article in PDF format)

Ülo SUURSAAR, Tiit KULLAS, and Mikk OTSMANN

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

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

Heat energy and water consumption in apartmentbuildings; 235–241

(full article in PDF format)

Teet-Andrus KÕIV and Alvar TOODE

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

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



CHRONICLE

Arvo Ots 70; 242



IN MEMORIAM

IlmarÖpik; 244