Effect of different meander curvatures on spatial variation of coherent turbulent flow structure inside ingoing multi-bend river meanders

Esfahani, FS; Keshavarzy, A

Effect of different meander curvatures on spatial variation of coherent turbulent flow structure inside ingoing multi-bend river meanders

Esfahani, FS Keshavarzy, A

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Publisher:: Springer
Publication Type:: Journal Article
Citation:: Stochastic Environmental Research and Risk Assessment, 2011, 25 (7), pp. 913 - 928
Issue Date:: 2011-01

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Field	Value	Language
dc.contributor.author	Esfahani, FS	en_US
dc.contributor.author	Keshavarzy, A	en_US
dc.date.issued	2011-01	en_US
dc.identifier.citation	Stochastic Environmental Research and Risk Assessment, 2011, 25 (7), pp. 913 - 928	en_US
dc.identifier.issn	1436-3240	en_US
dc.identifier.uri	http://hdl.handle.net/10453/18332
dc.description.abstract	In this paper, the effect of different curvatures on the spatial variation of coherent flow structure inside two physical models with both strongly curved and mild multibend meanders is investigated. Three dimensional flow velocities at three sequential meanders were measured using an Acoustic Doppler Velocity meter (Micro-ADV). Three dimensions of flow velocity are classified into two major classes and eight different bursting events. The contribution probability and transition probability of each zone is calculated from experimental data. The results indicated that the effect of curvature in sequential bends was important particularly for strongly curved bends. The contribution probability of the events for strongly curved meanders with relative curvature (Rc/B) of 2.6 were found to be higher than for mild curved meanders with relative curvature (Rc/B) of 4.43. The minimum contribution probability was found in external inward interaction event. In addition, analysis of bursting events showed that the highest values of transition probabilities occurred in the stable organizations for both models. The influences of different curvatures on distributions of the Reynolds shear stress, the turbulent kinetic energy, the streamwise velocity and the vertical velocity were also shown to be in good agreement with eroded bed. The above results can be useful for finding meandering patterns inside rivers and also in river training works.	en_US
dc.language	English	en_US
dc.publisher	Springer	en_US
dc.relation.ispartof	Stochastic Environmental Research and Risk Assessment	en_US
dc.relation.isbasedon	10.1007/s00477-011-0506-4	en_US
dc.subject.classification	Strategic, Defence & Security Studies	en_US
dc.title	Effect of different meander curvatures on spatial variation of coherent turbulent flow structure inside ingoing multi-bend river meanders	en_US
dc.type	Journal Article
utslib.citation.volume	7	en_US
utslib.citation.volume	25	en_US
utslib.for	0907 Environmental Engineering	en_US
utslib.for	01 Mathematical Sciences	en_US
utslib.for	09 Engineering	en_US
dc.location.activity	Cairns, AUSTRALIA
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
utslib.copyright.status	closed_access
pubs.consider-herdc	true	en_US
pubs.issue	7	en_US
pubs.volume	25	en_US

Abstract:

In this paper, the effect of different curvatures on the spatial variation of coherent flow structure inside two physical models with both strongly curved and mild multibend meanders is investigated. Three dimensional flow velocities at three sequential meanders were measured using an Acoustic Doppler Velocity meter (Micro-ADV). Three dimensions of flow velocity are classified into two major classes and eight different bursting events. The contribution probability and transition probability of each zone is calculated from experimental data. The results indicated that the effect of curvature in sequential bends was important particularly for strongly curved bends. The contribution probability of the events for strongly curved meanders with relative curvature (Rc/B) of 2.6 were found to be higher than for mild curved meanders with relative curvature (Rc/B) of 4.43. The minimum contribution probability was found in external inward interaction event. In addition, analysis of bursting events showed that the highest values of transition probabilities occurred in the stable organizations for both models. The influences of different curvatures on distributions of the Reynolds shear stress, the turbulent kinetic energy, the streamwise velocity and the vertical velocity were also shown to be in good agreement with eroded bed. The above results can be useful for finding meandering patterns inside rivers and also in river training works.

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http://hdl.handle.net/10453/18332