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Time-focused investigation of river channel morphological changes due to extreme floods

Auteur(s) et Affiliation(s)

RUSNÁK, M.
Inst. of Geography Slovak Academy of Sciences, Dept. of Physical Geography, Geomorphology and Natural Hazards, Bratislava, Slovaquie
Inst. of Geography Slovak Academy of Sciences, Dept. of Physical Geography, Geomorphology and Natural Hazards, Bratislava, Slovaquie


Description :
The paper deals with the effect of extreme flood events on lateral channel shift and bar pattern with relation to changes of the riparian zone land cover structure by using multitemporal analyzes of aerial photographs (3 time horizons – 1987, 2002 and 2009) in the GIS environment on the example of the 13.2 km long less regulated and laterally partly-confined meandering reach of the Ondava River (Eastern Slovakia). The photographs were chosen in a way to capture the morphological changes that occurred after floods. The most eroded category is that of arable land, followed by grasslands and pastures and shrubs. The AA. conclude that in case of the Ondava River, low magnitude high frequency floods, instead of causing destruction of the system, led to the stabilization of the channel, erosion of the concave bank and to the formation of the meandering planform. In contrast, the short recurrence interval of extreme floods led to an increased in tensity of erosion processes, a change of the meandering planform to slightly braided one, straightening of the channel and formation of gravel bars.


Type de document :
Article de périodique

Source :
Zeitschrift für Geomorphologie, issn : 0372-8854, 2014, vol. 58, n°. 2, p. 251-266, nombre de pages : 16, Références bibliographiques : 22 ref.

Date :
2014

Editeur :
Pays édition : Allemagne, Stuttgart, Gebruder Borntraeger

Langue :
Anglais
Droits :
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