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Sediment (un)balance budget in a high-gradient stream on flysch bedrock : A case study using dendrogeomorphic methods and bedload transport simulation

Auteur(s) et Affiliation(s)

ŠILHÁN, K.
Dept. of Physical Geography and Geoecology, Fac. of Science, Univ., Ostrava, Tcheque, Republique
GALIA, T.
Dept. of Physical Geography and Geoecology, Fac. of Science, Univ., Ostrava, Tcheque, Republique


Description :
The AA. analysed 138 cross-sections from the roots of predominantly broad-leaved trees, which were exposed in bank failures from different floods, on the Moravskoslezské Beskydy Mts in the Czech Republic. Using the spatial position of the roots and dating the exposure time, they determined the volume of material supply into the channel during the last flood, in 2010. In-channel sediment transport was analysed on 14 cross-sections, and the channel sediment thickness was estimated using the geophysically based ERT (Electrical Resistivity Tomography) method. The calculated total volume of sediment supply resulting from bank failures during the flood (based on dendrogeomorphic methods) was significantly lower than the calculated bedload transport for the entire study area. This finding implies that contemporary sediment sources cannot adequately cover the transport capacity during high-magnitude flood events, and in general, in-channel erosion processes prevail.


Type de document :
Article de périodique

Source :
Catena (Giessen), issn : 0341-8162, 2015, vol. 124, p. 18-27, nombre de pages : 10, Références bibliographiques : 51 ref.

Date :
2015

Editeur :
Pays édition : Allemagne, Cremlingen-Destedt, Catena

Langue :
Anglais
Droits :
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