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| Titel |
Scale orientated analysis of river width changes due to extreme flood hazards |
| VerfasserIn |
G. Krapesch, C. Hauer, H. Habersack |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 11, no. 8 ; Nr. 11, no. 8 (2011-08-04), S.2137-2147 |
| Datensatznummer |
250009614
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| Publikation (Nr.) |
 copernicus.org/nhess-11-2137-2011.pdf |
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| Zusammenfassung |
| This paper analyses the morphological effects of extreme floods (recurrence
interval >100 years) and examines which parameters best describe the width
changes due to erosion based on 5 affected alpine gravel bed rivers in
Austria. The research was based on vertical aerial photos of the rivers
before and after extreme floods, hydrodynamic numerical models and cross
sectional measurements supported by LiDAR data of the rivers. Average width
ratios (width after/before the flood) were calculated and correlated with
different hydraulic parameters (specific stream power, shear stress, flow
area, specific discharge). Depending on the geomorphological boundary
conditions of the different rivers, a mean width ratio between 1.12 (Lech
River) and 3.45 (Trisanna River) was determined on the reach scale. The
specific stream power (SSP) best predicted the mean width ratios of the
rivers especially on the reach scale and sub reach scale. On the local scale
more parameters have to be considered to define the "minimum morphological
spatial demand of rivers", which is a crucial parameter for addressing and
managing flood hazards and should be used in hazard zone plans and spatial
planning. |
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