The trends of drainage runoff change in loam soils during a multiyear period

Abstract

The article presents the influence of fluctuation of the main climatic factors over time on drainage runoff, the analysis of drainage runoff distribution in the course of a year. For the preparation of the present paper the data of drainage runoff as well as monthly precipitation and average temperature data from the hydro-meteorological station have been used. The seasonal differences of annual temperature amplitude and precipitation quantity decrease. It has a significant impact on the seasonal distribution of drainage runoff. The change of drainage runoff and its distribution over a year as well as the patterns of runoff have been analyzed. The article analyses the nature of multi-year change of runoff during the last four decades – periodic fluctuations and change trends. Analysing the heights of the drainage runoff during winter period (1969-2009) by decades, the drainage runoff has increased, in spring, summer and autumn negative trends were defined, i.e. the decrease of runoff, whereas in winter time the runoff increased (29% in the last decade) and the change of total annual runoff was positive.