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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Dynamics of flow structure, suspended sediment and morphology of large meandering rivers.
Dynamics of flow structure, suspended sediment and morphology of large meandering rivers.
Author : DOMINGUEZ RUBEN, L.(1,2), SZUPIANY, R.(1,2), ABAD, J. D.(3) & FARIAS, H.D.(4)
ABSTRACT
Meandering channels are one of the most common planform configurations of rivers and are the result of the complex
interaction between flow dynamics, sediment transport and morphology. Several field studies have analyzed the dynamics
of small rivers (width/depth<30) rather than large river systems (width/depth>30), mainly due to limitations on equipment,
logistics and methodologies. In the present study, measurements of flow structure, suspended sediment transport and bed
morphology are shown from a field campaign at a large meandering river (width/depth=58). Flow structure and suspended
sediment transport, was obtained by using an acoustic Doppler current profiler (ADCP) over several cross sections along
the river during bankfull stage. Results show different characteristics from the ones observed in previous studies
concerning small meandering rivers, such as: i) small and low intensities on secondary circulation, with lower effect on the
redistribution of bed and suspended sediment along the bends, ii) different locations between cores of maximum velocity,
maximum concentration and secondary circulation, indicating particular processes governing the interaction between
these variables, iii) lower cross section bed slope and absence of a second secondary circulation near outer bank,
suggesting particular processes of bank retreat, iv) a flat point-bar in the inner bank with lower slope near the bank and v)
a reduction of the width of thalweg, that deepens in the downstream direction, this may indicate that for this river, the
erosion and deposition processes are increased towards the downstream direction.
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 13/08/2015
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