Morphodynamics of the exit of a cutoff meander: experimental
findings from field and laboratory studies

J 2010

Morphodynamics of the exit of a cutoff meander: experimental findings from field and laboratory studies

LE COZ, Jérôme, Monika ŠULC MICHALKOVÁ, A. HAUET, Guillaume DRAMAIS, Katarína HOLUBOVÁ et. al.

Basic information

Original name

Morphodynamics of the exit of a cutoff meander: experimental findings from field and laboratory studies

Authors

LE COZ, Jérôme, Monika ŠULC MICHALKOVÁ, A. HAUET, Guillaume DRAMAIS, Katarína HOLUBOVÁ, Hervé PIÉGAY, André PAQUIER and Marek ČOMAJ

Edition

Earth Surface Processes and Landforms, 2010, 0197-9337

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

Earth magnetism, geodesy, geography

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

Impact factor

Impact factor: 2.111

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1002/esp.1896

UT WoS

000276677000001

Keywords in English

river morphodynamics;abandoned channel;cutoff meander;Morava river;Ain river

Abstract

V originále

The morphological evolution of the entrances and exits of abandoned river channels governs their hydrological connectivity. The study focusses on flow and sediment dynamics in the exit of a cutoff meander where the downstream entrance is still connected to the main channel, but the upstream entrance is closed. Two similar field and laboratory cases were investigated using innovative velocimetry techniques (acoustic Doppler profiling, image analysis). Laboratory experiments were conducted with a mobile-bed physical model of the Morava River (Slovakia). Field measurements were performed in the exit of the Port-Galland cutoff meander, Ain River (France). Both cases yielded consistent and complementary results from which a generic scheme for flow patterns and morphological evolution was derived. A simple analogy with flows in rectangular side cavities was used to explain the recirculating flow patterns which developed in the exit. A decelerating inflow deposits bedload in the downstream part of the cavity, while the upstream part is eroded by an accelerating outflow, leading to the retreat of the upstream bank. In the field, strong secondary currents were observed, especially in the inflow, which may enhance the scouring of the downstream corner of the cavity. Also, fine sediment deposits constituted a silt layer in a transitional zone, located between the mouth of the abandoned channel and the oxbow-lake within the cutoff meander. Attempts at morphological prediction should consider not only the flow and sediment conditions in the cavity, but also the dynamics of the main channel. Copyright © 2010 John Wiley & Sons, Ltd

Citovat

LE COZ, Jérôme, Monika ŠULC MICHALKOVÁ, A. HAUET, Guillaume DRAMAIS, Katarína HOLUBOVÁ, Hervé PIÉGAY, André PAQUIER and Marek ČOMAJ. Morphodynamics of the exit of a cutoff meander: experimental findings from field and laboratory studies. Earth Surface Processes and Landforms. 2010, vol. 35, No 3, p. 249-261. ISSN 0197-9337. Available from: https://dx.doi.org/10.1002/esp.1896.

@article{992921,
   author = {Le Coz, Jérôme and Šulc Michalková, Monika and Hauet, A. and Dramais, Guillaume and Holubová, Katarína and Piégay, Hervé and Paquier, André and Čomaj, Marek},
   article_number = {3},
   doi = {http://dx.doi.org/10.1002/esp.1896},
   keywords = {river morphodynamics;abandoned channel;cutoff meander;Morava river;Ain river},
   language = {eng},
   issn = {0197-9337},
   journal = {Earth Surface Processes and Landforms},
   title = {Morphodynamics of the exit of a cutoff meander: experimental findings from field and laboratory studies},
   url = {http://onlinelibrary.wiley.com/doi/10.1002/esp.1896/abstract},
   volume = {35},
   year = {2010}
}

TY  - JOUR
ID  - 992921
AU  - Le Coz, Jérôme - Šulc Michalková, Monika - Hauet, A. - Dramais, Guillaume - Holubová, Katarína - Piégay, Hervé - Paquier, André - Čomaj, Marek
PY  - 2010
TI  - Morphodynamics of the exit of a cutoff meander: experimental findings from field and laboratory studies
JF  - Earth Surface Processes and Landforms
VL  - 35
IS  - 3
SP  - 249-261
EP  - 249-261
SN  - 01979337
KW  - river morphodynamics;abandoned channel;cutoff meander;Morava river;Ain river
UR  - http://onlinelibrary.wiley.com/doi/10.1002/esp.1896/abstract
L2  - http://onlinelibrary.wiley.com/doi/10.1002/esp.1896/abstract
N2  - The morphological evolution of the entrances and exits of abandoned river channels governs their hydrological connectivity. The study focusses on flow and sediment dynamics in the exit of a cutoff meander where the downstream entrance is still connected to the main channel, but the upstream entrance is closed. Two similar field and laboratory cases were investigated using innovative velocimetry techniques (acoustic Doppler profiling, image analysis). Laboratory experiments were conducted with a mobile-bed physical model of the Morava River (Slovakia). Field measurements were performed in the exit of the Port-Galland cutoff meander, Ain River (France). Both cases yielded consistent and complementary results from which a generic scheme for flow patterns and morphological evolution was derived. A simple analogy with flows in rectangular side cavities was used to explain the recirculating flow patterns which developed in the exit. A decelerating inflow deposits bedload in the downstream part of the cavity, while the upstream part is eroded by an accelerating outflow, leading to the retreat of the upstream bank. In the field, strong secondary currents were observed, especially in the inflow, which may enhance the scouring of the downstream corner of the cavity. Also, fine sediment deposits constituted a silt layer in a transitional zone, located between the mouth of the abandoned channel and the oxbow-lake within the cutoff meander. Attempts at morphological prediction should consider not only the flow and sediment conditions in the cavity, but also the dynamics of the main channel. Copyright © 2010 John Wiley & Sons, Ltd
ER  -

LE COZ, Jérôme, Monika ŠULC MICHALKOVÁ, A. HAUET, Guillaume DRAMAIS, Katarína HOLUBOVÁ, Hervé PIÉGAY, André PAQUIER and Marek ČOMAJ. Morphodynamics of the exit of a cutoff meander: experimental findings from field and laboratory studies. \textit{Earth Surface Processes and Landforms}. 2010, vol.~35, No~3, p.~249-261. ISSN~0197-9337. Available from: https://dx.doi.org/10.1002/esp.1896.

Detailed Information on Publication Record