Three-dimensional flow in centered pool-riffle sequences

Pool-riffle sequences are geomorphological features of many streams, thought to contribute to the hydrodynamic variability necessary to support healthy habitat conditions. Due to this fact, the addition of artificial pools and riffles is a common alternative for restoration projects on channelized s...

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Autores principales: Rodríguez, J.F., García, C.M., García, M.H.
Formato: JOUR
Lenguaje:English
Materias:
Bed shear stresss
Discharge conditions
Flow variability
Habitat conditions
Restoration project
Three-dimensional flow
Threedimensional (3-d)
Turbulence anisotropy
Flow patterns
Lakes
Restoration
Secondary flow
Three dimensional
anisotropy
discharge
environmental restoration
flow measurement
flow pattern
flow structure
pool-riffle sequence
secondary flow
streamflow
three-dimensional flow
topographic effect
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00431397_v49_n1_p202_Rodriguez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00431397_v49_n1_p202_Rodriguez
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spelling todo:paper_00431397_v49_n1_p202_Rodriguez2023-10-03T14:51:31Z Three-dimensional flow in centered pool-riffle sequences Rodríguez, J.F. García, C.M. García, M.H. Bed shear stresss Discharge conditions Flow variability Habitat conditions Restoration project Three-dimensional flow Threedimensional (3-d) Turbulence anisotropy Flow patterns Lakes Restoration Secondary flow Three dimensional anisotropy discharge environmental restoration flow measurement flow pattern flow structure pool-riffle sequence secondary flow streamflow three-dimensional flow topographic effect Pool-riffle sequences are geomorphological features of many streams, thought to contribute to the hydrodynamic variability necessary to support healthy habitat conditions. Due to this fact, the addition of artificial pools and riffles is a common alternative for restoration projects on channelized streams. In this paper, detailed three-dimensional (3-D) flow measurements conducted on a scale model of an existing pool-riffle design implemented as part of a restoration project is presented. The design incorporated the basic features of natural pool-riffle sequences but maintained the deepest part of the pool in the center of the cross section and away from the banks. Results showed that the 3-D flow patterns were qualitatively different for two discharge conditions tested. The lower discharge case was strongly affected by the topography, displaying a pattern consistent with a secondary flow generated by the curvature of the streamlines. The higher discharge case was less affected by the topography, presenting a secondary flow pattern similar to that observed over a flat bed and typically associated with turbulence anisotropy. Self-maintenance and flow variability were also investigated. Even though convergence of the values of bed shear stresses at pool and riffle sections with increasing discharge did take place, reversal conditions did not occur. The difference in flow structure with flow stage was also reflected in the spatial flow variability, the lower discharge displaying larger variability than the higher discharge. The higher discharge generated a level of variability comparable with the values obtained over a flat bed. © 2013. American Geophysical Union. All Rights Reserved. JOUR English info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00431397_v49_n1_p202_Rodriguez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language English
orig_language_str_mv English
topic Bed shear stresss
Discharge conditions
Flow variability
Habitat conditions
Restoration project
Three-dimensional flow
Threedimensional (3-d)
Turbulence anisotropy
Flow patterns
Lakes
Restoration
Secondary flow
Three dimensional
anisotropy
discharge
environmental restoration
flow measurement
flow pattern
flow structure
pool-riffle sequence
secondary flow
streamflow
three-dimensional flow
topographic effect
spellingShingle Bed shear stresss
Discharge conditions
Flow variability
Habitat conditions
Restoration project
Three-dimensional flow
Threedimensional (3-d)
Turbulence anisotropy
Flow patterns
Lakes
Restoration
Secondary flow
Three dimensional
anisotropy
discharge
environmental restoration
flow measurement
flow pattern
flow structure
pool-riffle sequence
secondary flow
streamflow
three-dimensional flow
topographic effect
Rodríguez, J.F.
García, C.M.
García, M.H.
Three-dimensional flow in centered pool-riffle sequences
topic_facet Bed shear stresss
Discharge conditions
Flow variability
Habitat conditions
Restoration project
Three-dimensional flow
Threedimensional (3-d)
Turbulence anisotropy
Flow patterns
Lakes
Restoration
Secondary flow
Three dimensional
anisotropy
discharge
environmental restoration
flow measurement
flow pattern
flow structure
pool-riffle sequence
secondary flow
streamflow
three-dimensional flow
topographic effect
description Pool-riffle sequences are geomorphological features of many streams, thought to contribute to the hydrodynamic variability necessary to support healthy habitat conditions. Due to this fact, the addition of artificial pools and riffles is a common alternative for restoration projects on channelized streams. In this paper, detailed three-dimensional (3-D) flow measurements conducted on a scale model of an existing pool-riffle design implemented as part of a restoration project is presented. The design incorporated the basic features of natural pool-riffle sequences but maintained the deepest part of the pool in the center of the cross section and away from the banks. Results showed that the 3-D flow patterns were qualitatively different for two discharge conditions tested. The lower discharge case was strongly affected by the topography, displaying a pattern consistent with a secondary flow generated by the curvature of the streamlines. The higher discharge case was less affected by the topography, presenting a secondary flow pattern similar to that observed over a flat bed and typically associated with turbulence anisotropy. Self-maintenance and flow variability were also investigated. Even though convergence of the values of bed shear stresses at pool and riffle sections with increasing discharge did take place, reversal conditions did not occur. The difference in flow structure with flow stage was also reflected in the spatial flow variability, the lower discharge displaying larger variability than the higher discharge. The higher discharge generated a level of variability comparable with the values obtained over a flat bed. © 2013. American Geophysical Union. All Rights Reserved.
format JOUR
author Rodríguez, J.F.
García, C.M.
García, M.H.
author_facet Rodríguez, J.F.
García, C.M.
García, M.H.
author_sort Rodríguez, J.F.
title Three-dimensional flow in centered pool-riffle sequences
title_short Three-dimensional flow in centered pool-riffle sequences
title_full Three-dimensional flow in centered pool-riffle sequences
title_fullStr Three-dimensional flow in centered pool-riffle sequences
title_full_unstemmed Three-dimensional flow in centered pool-riffle sequences
title_sort three-dimensional flow in centered pool-riffle sequences
url http://hdl.handle.net/20.500.12110/paper_00431397_v49_n1_p202_Rodriguez
work_keys_str_mv AT rodriguezjf threedimensionalflowincenteredpoolrifflesequences
AT garciacm threedimensionalflowincenteredpoolrifflesequences
AT garciamh threedimensionalflowincenteredpoolrifflesequences
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