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SEASONAL CHANGES IN HYDROLOGICAL REGIME IN SUBSURFACE RUNOFF IN MIDDLE LITHUANIA
Abstract
The activity of drainage during various seasons and the impact of meteorological conditions on drainage runoff in different seasons (winter, spring, summer and autumn) during the period of 1969-2009 are reviewed. Particularly important indicator of drainage activity пїЅ dynamics of water runoff. The present article analyzes the change of climatic conditions in the object, Central Lithuania, following the data of Kaunas Meteorological Station; and it is determined that during the period of 1969-2009 the lowest quantity of precipitation is during spring and winter, and the highest пїЅ during summer and autumn in the territory under research. While analyzing the temperature in decades, it is found that it has been constantly increasing during spring, and in the past decade (2000-2009) was 1,13 пїЅ C higher, compared to the average temperature of 1970-2009. Following the data of four decades, drainage runoff is the highest in spring and the lowest - in summer. While examining the impact of meteorological conditions on dynamics of drainage runoff in the presence of changing climatic conditions, it is determined that the relationship between drainage runoff and precipitation during different seasons was weak (spring and summer) and the average one during winter and autumn. The analysis of relation between drainage runoff and average air temperature during different seasons revealed the average relation during winter and very weak relation during other seasons.
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