Publication details

Response of channel dynamics to recent meander neck cut-off in a lowland meandering river with artificial training history: the Morava River, Czech Republic

Authors

ONDRUCH Jakub MÁČKA Zdeněk ŠULC MICHALKOVÁ Monika PUTIŠKA René KNOT Martin HOLÍK Petr MIŘIJOVSKÝ Jakub JENČO Marián

Year of publication 2018
Type Article in Periodical
Magazine / Source Hydrological Sciences Journal
MU Faculty or unit

Faculty of Science

Citation
Web https://doi.org/10.1080/02626667.2018.1474218
Doi http://dx.doi.org/10.1080/02626667.2018.1474218
Keywords neck cut-off; meander; Morava River; oxbow; sedimentation
Description 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 cutoff. The main objectives were: calculation of the amount of sediment released to the channel by collapse of the 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 past six decades. Bank erosion rates substantially exceeded long-term averages (0.63 - 6.21 m year -1, post cut-off). Despite a low entrance angle, alluvial plugs in a newly formed oxbow lake were established within a few months. Between 2006 and 2016, sedimentation of the alluvial plugs proceeded at an average rate of 0.55 m year -1, reflecting the time since cut-off and the frequency of overbank flows.