Flow convergence routing hypothesis for pool-riffle maintenance in alluvial rivers


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dc.contributor.author Wheaton, Joseph
dc.contributor.author MacWilliams, M.
dc.contributor.author Pasternack, G. B.
dc.contributor.author Kitanidis, P. K.
dc.date.accessioned 2008-12-16T12:53:04Z
dc.date.available 2008-12-16T12:53:04Z
dc.date.issued 2006-10
dc.identifier.citation Wheaton , J , MacWilliams , M , Pasternack , G B & Kitanidis , P K 2006 , ' Flow convergence routing hypothesis for pool-riffle maintenance in alluvial rivers ' Water Resources Research , vol 42 , no. 10 . , 10.1029/2005WR004391 en
dc.identifier.issn 1944-7973
dc.identifier.other PURE: 96257
dc.identifier.other dspace: 2160/1691
dc.identifier.uri http://hdl.handle.net/2160/1691
dc.description Wheaton, Joseph, MacWilliams, M., Pasternack, G.B., Kitanidis, P.K., 92006) 'Flow convergence routing hypothesis for pool-riffle maintenance in alluvial rivers', Water Resources Research 42 pp.W10427 RAE2008 en
dc.description.abstract The velocity reversal hypothesis is commonly cited as a mechanism for the maintenance of pool-riffle morphology. Although this hypothesis is based on the magnitude of mean flow parameters, recent studies have suggested that mean parameters are not sufficient to explain the dominant processes in many pool-riffle sequences. In this study, two- and three-dimensional models are applied to simulate flow in the pool-riffle sequence on Dry Creek, California, where the velocity reversal hypothesis was first proposed. These simulations provide an opportunity to evaluate the hydrodynamics underlying the observed reversals in near-bed and section-averaged velocity and are used to investigate the influence of secondary currents, the advection of momentum, and cross-stream flow variability. The simulation results support the occurrence of a reversal in mean velocity and mean shear stress with increasing discharge. However, the results indicate that the effects of flow convergence due to an upstream constriction and the routing of flow through the system are more significant in influencing pool-riffle morphology than the occurrence of a mean velocity reversal. The hypothesis of flow convergence routing is introduced as a more meaningful explanation of the mechanisms acting to maintain pool-riffle morphology. en
dc.language.iso eng
dc.relation.ispartof Water Resources Research en
dc.subject bed shear stress en
dc.subject channel morphology en
dc.subject flow convergence en
dc.subject hydrodynamics en
dc.subject numerical modeling en
dc.subject pool-riffle en
dc.subject river modeling en
dc.subject velocity reversal en
dc.title Flow convergence routing hypothesis for pool-riffle maintenance in alluvial rivers en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1029/2005WR004391
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.contributor.institution River Basin Dynamics and Hydrology en
dc.description.status Peer reviewed en

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