DBPapers
DOI: 10.5593/SGEM2015/B32/S13.050

THE METHODS FOR FIELD ASSESSMENT OF RILL EROSION IN THE CZECH REPUBLIC

V.Sobotkova, M. Dumbrovsky, J. Sobotka
Thursday 24 September 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-37-7 / ISSN 1314-2704, June 18-24, 2015, Book3 Vol. 2, 371-378 pp

ABSTRACT
In the Czech Republic soil erosion is a significant degradation process which threats more than half area of the arable land nowadays. The paper deals with the problem with rill and inter-rill erosion. Rill erosion is a serious problem in many cultivated fields in the Czech Republic. Erosion deprives the agricultural soils of the most fertile part (humus horizon), makes degradation of physical, chemical and biological soil properties and reduces the thickness of the soil and humus content in the soil.
The main purpose of this paper is to provide information about a suitable method for assessment of rill erosion with such special kind of direct measurement procedures. Universal Soil Loss Equation often under-estimates erosion on agricultural fields because it does not account for the loss of soil from rills. To properly assess soil erosion in agricultural areas, it is necessary to determine precisely the volume of rills in the field by using direct methods.
For analysis, when calculating rill volumes, we developed a unique cross section method. At the Institute of Landscape Water Management, Brno University of Technology there was designed and constructed a device called “soil erosion bridge”, which allows to measure the soil surface cross section and quantifies the volume of erosion rills.
In the South Moravia Region in the Czech Republic there were hundreds of cross sections of erosion rills measured using the special kind of the soil erosion bridge directly in the field. With this method it is possible to calculate soil loss in different parts of a hillside on the plot after concrete intensive rains. The value of soil loss measured using the cross section method was always in excess of 100 t.ha–1.year–1. This is a value many times higher than the tolerated limit of soil loss in the Czech Republic. The temporal development of erosion rills is also evaluated in this paper. From the measured values it can be determined that after the first rainfalls the soil loss was about 65% of the total soil loss for the vegetation period.

Keywords: soil loss, rill erosion, temporal development, soil erosion bridge

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