Bertalan, László

Szabó, Gergely

Yousefi, Saleh

University of Debrecen Electronic Archive

Geophysical Research Abstracts
Vol. 20, EGU2018-1982-2, 2018
EGU General Assembly 2018
© Author(s) 2018. CC Attribution 4.0 license.
Assessing the rates of channel shifts, bend development and bank erosion
hazard on the Sajó River (Hungary) by aerial and terrestrial
photogrammetry
László Bertalan (1), Gergely Szabó (1), and Saleh Yousefi (2)
(1) Department of Physical Geography and Geoinformatics, University of Debrecen, Debrecen, Hungary
(bertalan@science.unideb.hu), (2) Department of Watershed Management, Tarbiat Modares University, Tehran, Iran
(saleh.yousefi@modares.ac.ir)
The alluvial meandering Sajó River (or Slaná in Slovakian) is a transboundary river of Slovakia and Hungary with
a total length of 229 km, of which 124 km is located in the Hungarian territory. Regarding the river regulation
and management, Sajó River shows one of the highest rate of free forming sections in compare with other alluvial
rivers in Hungary.
The recent morphodynamics of Sajó River had been investigated by GIS analysis of planform geometry
parameters based on cartographic data and historical aerial imagery regarding the period between 1952 and 2011.
According to the natural and anthropogenic effects the study reach of Sajó River had been classified into 12
sub-reaches. The horizontal dynamics of free-forming unconfined meandering reaches were analyzed regularly
by DJI Phantom 2 UAV (Unmanned Aerial Vehicle) drone surveys. In selected bends terrestrial close-range
photogrammetry and Structure-from-Motion methods were used in order to generate high resolution point clouds.
This base data allowed us to estimate the rate and type of lateral bank erosion hazard.
The results show that the rate of lateral erosion exceeds the mean annual value of 4.5 meters/year in study
reach; moreover, the results indicate a bank retreat of 2 meters/month at the most erosive reaches. Diverse bend
evolution types from translation to rotation can be observed and these processes are followed by slump block
failures and crevasse splay phenomena.
This approach provides a complex and detailed overview about the recent geomorphological state the Hun-
garian section of Sajó River. The process results could help to reveal the main driving factors of the extensive
lateral erosion hazard in this area in the future.
"Supported by the ÚNKP-17-3 New National Excellence Program of the Ministry of Human Capacities"


Assessing the rates of channel shifts, bend development and bank erosion hazard on the Sajó River (Hungary) by aerial and terrestrial photogrammetry

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Assessing the rates of channel shifts, bend development and bank erosion hazard on the Sajó River (Hungary) by aerial and terrestrial photogrammetry

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