DBPapers
DOI: 10.5593/SGEM2016/HB33/S02.013

ESTIMATION OF CHANGES IN EROSION GULLY ON A HILLSLOPE

R. Nosko, R. Vyleta, M. Frastia, A. Skrinar, M. Danacova
Friday 11 November 2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, SGEM Vienna GREEN Extended Scientific Sessions, www.sgemviennagreen.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-81-0 / ISSN 1314-2704, 2 - 5 November, 2016, Book 3 Vol. 3, 95-102pp, DOI: 10.5593/SGEM2016/HB33/S02.013

ABSTRACT

The Myjava Hill Land has ideal conditions for the formation of fast runoff processes and intensive soil erosion. The intensive erosion activity from the concentrated runoff on slopes creates suitable conditions for the formation of permanent and ephemeral gullies. The Turá Lúka region is considered to have a relatively high density of permanent gullies within the Slovak Republic.
Changes in parameters of the permanent erosion gully located on a selected hillslope with arable land in the region of Turá Lúka were analysed in this paper. Changes in its length and location on a hillslope were analysed by comparing the historical and present maps. The aim of this paper is to determine the changes of the gully parameters (length, volume, slope, shape) using the volumetric method. New measurement technologies for detailed modelling and visualization of the gully parameters were utilized (for example 3D laser scanning).
For obtaining the information about the actual physical objects and for the modelling of digital terrain models (DTM), an unmanned aerial vehicle (UAV) systems and the terrestrial laser scanning (TLS) method were used. The DTMs were further used to estimate the parameters of the gully. The field measurements were undertaken repeatedly in 2014, 2015 and 2016. In 2014, the measurements were performed with an UAV system with fixed wings; in 2015 and 2016 a terrestrial laser scanner was used. The processing of the raw data was performed using the PhotoScan SW (UAV photogrammetry) and the Trimble Scene SW (TLS). Further processing continued in the ArcGIS environment. Gully volumes were estimated using the DTM. The results demonstrate that the erosion processes are still ongoing in the gully and that its volume has continuously been enlarging within the years.

Keywords: gully erosion, terrestrial laser scanning (TLS), digital terrain models (DTM)

PAPER DOI: 10.5593/SGEM2016/HB33/S02.013, ESTIMATION OF CHANGES IN EROSION GULLY ON A HILLSLOPE

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