Flow resistance equations without explicit estimation of the resistance coefficient for coarse-grained rivers

The uncertainty and subjectivity inherent in estimating the resistance coeffi-cient is one of the main sources of error in the application of flow resistance equations tonatural channels. Various studies have shown that it is possible to relate discharge suc-cessfully with variables related to the h...

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Detalles Bibliográficos
Autores: López Alonso, Raúl, Barragán Fernández, Javier, Colomer, M. Àngels (Maria Àngels)
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2007
País:España
Institución:Universitat de Lleida (UdL)
Repositorio:Repositori Obert UdL
OAI Identifier:oai:repositori.udl.cat:10459.1/67728
Acceso en línea:https://doi.org/10.1016/j.jhydrol.2007.02.027
http://hdl.handle.net/10459.1/67728
Access Level:acceso abierto
Palabra clave:Modelos predictivos
Gravel-bed river
Mountain stream
Fluvial hydraulics
Flow resistance
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spelling Flow resistance equations without explicit estimation of the resistance coefficient for coarse-grained riversLópez Alonso, RaúlBarragán Fernández, JavierColomer, M. Àngels (Maria Àngels)Modelos predictivosGravel-bed riverMountain streamFluvial hydraulicsFlow resistanceThe uncertainty and subjectivity inherent in estimating the resistance coeffi-cient is one of the main sources of error in the application of flow resistance equations tonatural channels. Various studies have shown that it is possible to relate discharge suc-cessfully with variables related to the hydraulic flow geometry without the need for anindependent estimate of the resistance coefficient. The aim of this paper is to calibrateand validate three models, previously proposed by other researchers, using an extensiveempirical base, made up of 904 data from over 400 reaches of gravel-bed rivers and moun-tain streams from various regions of the world.Thanks to the cross validation procedure, the three models were calibrated using thefull database, which allowed the fitted equations to be based on the maximum numberof observations. There are no important differences between the three models calibratedwith regard to their explanatory power. These models show that the exponent of thehydraulic radius is greater than 2/3 and that the exponent of the slope is closer to 1/4than 1/2 in gravel-bed rivers and mountain streams. Validation confirmed the precisionof the fitted equations, by reaching predictive power values comparable with those fromcalibration. The fitted equations can be successfully applied in reaches of gravel-bed riv-ers and mountain streams (for non-sinuous, un-vegetated and hydraulically-wide channelsand for flow higher than 0.1 m3/s and lower or equal to bankfull discharge) for which thereis no specific detailed information about flow resistance available.Elsevier2007info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://doi.org/10.1016/j.jhydrol.2007.02.027http://hdl.handle.net/10459.1/67728reponame:Repositori Obert UdL instname:Universitat de Lleida (UdL)InglésVersió postprint del document publicat a: https://doi.org/10.1016/j.jhydrol.2007.02.027Journal of Hydrology, 2007, vol. 338, num. 1-2, p. 113-121cc-by-nc-nd, (c) Elsevier, 2007info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0/oai:repositori.udl.cat:10459.1/677282026-06-24T12:42:17Z
dc.title.none.fl_str_mv Flow resistance equations without explicit estimation of the resistance coefficient for coarse-grained rivers
title Flow resistance equations without explicit estimation of the resistance coefficient for coarse-grained rivers
spellingShingle Flow resistance equations without explicit estimation of the resistance coefficient for coarse-grained rivers
López Alonso, Raúl
Modelos predictivos
Gravel-bed river
Mountain stream
Fluvial hydraulics
Flow resistance
title_short Flow resistance equations without explicit estimation of the resistance coefficient for coarse-grained rivers
title_full Flow resistance equations without explicit estimation of the resistance coefficient for coarse-grained rivers
title_fullStr Flow resistance equations without explicit estimation of the resistance coefficient for coarse-grained rivers
title_full_unstemmed Flow resistance equations without explicit estimation of the resistance coefficient for coarse-grained rivers
title_sort Flow resistance equations without explicit estimation of the resistance coefficient for coarse-grained rivers
dc.creator.none.fl_str_mv López Alonso, Raúl
Barragán Fernández, Javier
Colomer, M. Àngels (Maria Àngels)
author López Alonso, Raúl
author_facet López Alonso, Raúl
Barragán Fernández, Javier
Colomer, M. Àngels (Maria Àngels)
author_role author
author2 Barragán Fernández, Javier
Colomer, M. Àngels (Maria Àngels)
author2_role author
author
dc.subject.none.fl_str_mv Modelos predictivos
Gravel-bed river
Mountain stream
Fluvial hydraulics
Flow resistance
topic Modelos predictivos
Gravel-bed river
Mountain stream
Fluvial hydraulics
Flow resistance
description The uncertainty and subjectivity inherent in estimating the resistance coeffi-cient is one of the main sources of error in the application of flow resistance equations tonatural channels. Various studies have shown that it is possible to relate discharge suc-cessfully with variables related to the hydraulic flow geometry without the need for anindependent estimate of the resistance coefficient. The aim of this paper is to calibrateand validate three models, previously proposed by other researchers, using an extensiveempirical base, made up of 904 data from over 400 reaches of gravel-bed rivers and moun-tain streams from various regions of the world.Thanks to the cross validation procedure, the three models were calibrated using thefull database, which allowed the fitted equations to be based on the maximum numberof observations. There are no important differences between the three models calibratedwith regard to their explanatory power. These models show that the exponent of thehydraulic radius is greater than 2/3 and that the exponent of the slope is closer to 1/4than 1/2 in gravel-bed rivers and mountain streams. Validation confirmed the precisionof the fitted equations, by reaching predictive power values comparable with those fromcalibration. The fitted equations can be successfully applied in reaches of gravel-bed riv-ers and mountain streams (for non-sinuous, un-vegetated and hydraulically-wide channelsand for flow higher than 0.1 m3/s and lower or equal to bankfull discharge) for which thereis no specific detailed information about flow resistance available.
publishDate 2007
dc.date.none.fl_str_mv 2007
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://doi.org/10.1016/j.jhydrol.2007.02.027
http://hdl.handle.net/10459.1/67728
url https://doi.org/10.1016/j.jhydrol.2007.02.027
http://hdl.handle.net/10459.1/67728
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1016/j.jhydrol.2007.02.027
Journal of Hydrology, 2007, vol. 338, num. 1-2, p. 113-121
dc.rights.none.fl_str_mv cc-by-nc-nd, (c) Elsevier, 2007
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
rights_invalid_str_mv cc-by-nc-nd, (c) Elsevier, 2007
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositori Obert UdL
instname:Universitat de Lleida (UdL)
instname_str Universitat de Lleida (UdL)
reponame_str Repositori Obert UdL
collection Repositori Obert UdL
repository.name.fl_str_mv
repository.mail.fl_str_mv
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