Response of channel dynamics to recent meander neck cut-off in a lowland meandering river with artificial training history: the Morava River, Czech Republic
| Autor: | Zdeněk Máčka, Jakub Ondruch, Marián Jenčo, Petr Holík, Jakub Miřijovský, Martin Knot, Monika Šulc Michalková, René Putiška |
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| Rok vydání: | 2018 |
| Předmět: |
Hydrology
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Floodplain 0208 environmental biotechnology Sediment 02 engineering and technology 01 natural sciences Deposition (geology) 020801 environmental engineering Meander Erosion Alluvium Geology Bank erosion Channel (geography) 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Hydrological Sciences Journal. 63:1236-1254 |
| ISSN: | 2150-3435 0262-6667 |
| Popis: | One-decade long observations of post-cut-off channel development and oxbow lake formation are presented to offer insight into the morphological response of the Morava River to neck cut-off (during spring flood, 2006). The main objectives were: calculation of the amount of sediment released to the channel by collapse of meander neck; comparison of floodplain erosion and deposition rates before and after cut-off; and description of the rate and pattern of oxbow lake sedimentation. The amount of sediment released due to cut-off (~35 000 m3) equalled 2–5 years of sediment input by lateral erosion averaged for the last six decades. Concave bank erosion rates substantially exceeded long-term averages (0.63–6.21 m year−1, post cut-off). The spatial extent of channel changes triggered by cut-off was smaller than the response to artificial cut-off of six meanders in the 1930s. Despite a low entrance angle, alluvial plugs in a newly formed oxbow lake were established within a few months. Between April 2006 ... |
| Databáze: | OpenAIRE |
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