TITLE

Švento ežero daugiamečiai ir sezoniniai vandens lygio svyravimai

AUTHOR(S)
Kilkus, Kęstutis; Vilkelytė, Dovilė
PUB. DATE
July 2011
SOURCE
Geografija;2011, Vol. 47 Issue 2, p55
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The water level of a lake is a very important characteristic determining its area, water capacity, water runoff, etc. In closed lakes such as Å ventas, typical are large water level fluctuations (in this lake, the water level amplitude in the 20th century was almost 3 m). The water level was highest (160.2 m) in 1930 and lowest (157.7 m) in 1973. When the water level gets higher or lower, the lake area reacts to these changes. On average, with changing the water level of Lake Å ventas by 2%, the area of the lake changes by 1.8%. The largest area of the lake during the study period was 457.5 ha (in 1930) and the least 432.9 ha (in 1973). According to the water level data of 2007-2010, stored at the Utena Department of Environmental Protection, the amplitude of water level fluctuations was determined (0.24 m), which makes only 9% of the 20th century lake water level fluctuations. The highest water level in the lake is in spring or summer, depending on the related factors such as snow melting, runoff, and summer precipitation. The evaluation of monthly water level deviations from the average annual values has shown that they may change by up to 29.8%. This error must be considered when analysing water level data of the lake, estimated from the cartographic material or by calculations.
ACCESSION #
74564667

 

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