Sediment organization and adjustment in a torrential reach of the upper Ijuez river, central Spanish Pyrenees

The dynamics of the torrential upper reach of the Ijuez River, Central Spanish Pyrenees, was analyzed in relation to the spatial organization of grain size. The reach is located in the Eocene flysch, which usually acts as a high sediment production area, particularly during periods of intense human...

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Autores: Gómez-Villar, Amelia [0000-0002-0061-8017], Sanjuan, Yasmina [0000-0003-4400-4444], García Ruiz, José María [0000-0002-8535-817X], Nadal Romero, María Estela [0000-0002-4651-7828], Álvarez Martínez, Javier [0000-0002-0861-2840], Arnáez Vadillo, José [0000-0001-8248-5272], Serrano Muela, María Pilar
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2014
País:España
Recursos:Universidad de La Rioja (UR)
Repositorio:RIUR. Repositorio Institucional de la Universidad de La Rioja
OAI Identifier:oai:portal.dialnet.es:doc/5bbc5d02b7506047d09b5d41
Acesso em linha:https://investigacion.unirioja.es/documentos/5bbc5d02b7506047d09b5d41
Access Level:acceso abierto
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oai_identifier_str oai:portal.dialnet.es:doc/5bbc5d02b7506047d09b5d41
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv Sediment organization and adjustment in a torrential reach of the upper Ijuez river, central Spanish Pyrenees
title Sediment organization and adjustment in a torrential reach of the upper Ijuez river, central Spanish Pyrenees
spellingShingle Sediment organization and adjustment in a torrential reach of the upper Ijuez river, central Spanish Pyrenees
Gómez-Villar, Amelia [0000-0002-0061-8017]
title_short Sediment organization and adjustment in a torrential reach of the upper Ijuez river, central Spanish Pyrenees
title_full Sediment organization and adjustment in a torrential reach of the upper Ijuez river, central Spanish Pyrenees
title_fullStr Sediment organization and adjustment in a torrential reach of the upper Ijuez river, central Spanish Pyrenees
title_full_unstemmed Sediment organization and adjustment in a torrential reach of the upper Ijuez river, central Spanish Pyrenees
title_sort Sediment organization and adjustment in a torrential reach of the upper Ijuez river, central Spanish Pyrenees
dc.creator.none.fl_str_mv Gómez-Villar, Amelia [0000-0002-0061-8017]
Sanjuan, Yasmina [0000-0003-4400-4444]
García Ruiz, José María [0000-0002-8535-817X]
Nadal Romero, María Estela [0000-0002-4651-7828]
Álvarez Martínez, Javier [0000-0002-0861-2840]
Arnáez Vadillo, José [0000-0001-8248-5272]
Serrano Muela, María Pilar
author Gómez-Villar, Amelia [0000-0002-0061-8017]
author_facet Gómez-Villar, Amelia [0000-0002-0061-8017]
Sanjuan, Yasmina [0000-0003-4400-4444]
García Ruiz, José María [0000-0002-8535-817X]
Nadal Romero, María Estela [0000-0002-4651-7828]
Álvarez Martínez, Javier [0000-0002-0861-2840]
Arnáez Vadillo, José [0000-0001-8248-5272]
Serrano Muela, María Pilar
author_role author
author2 Sanjuan, Yasmina [0000-0003-4400-4444]
García Ruiz, José María [0000-0002-8535-817X]
Nadal Romero, María Estela [0000-0002-4651-7828]
Álvarez Martínez, Javier [0000-0002-0861-2840]
Arnáez Vadillo, José [0000-0001-8248-5272]
Serrano Muela, María Pilar
author2_role author
author
author
author
author
author
description The dynamics of the torrential upper reach of the Ijuez River, Central Spanish Pyrenees, was analyzed in relation to the spatial organization of grain size. The reach is located in the Eocene flysch, which usually acts as a high sediment production area, particularly during periods of intense human activity. The Ijuez Valley was cultivated and densely populated until the middle of the 20th century, resulting in general deforestation and the development of debris flows, shallow landslides, sheet wash erosion and deep gullies. As a consequence, the alluvial plain became characterized by the presence of large quantities of coarse sediment. The spatial organization of sediment showed a progressive downstream decline in the cobble and boulder size, especially in the channel, whereas the remainder of the alluvial plain showed large variability. No trend in the occurrence of the largest boulders was evident throughout the reach, confirming the importance of debris and hyperconcentrated flows in sediment transport. The torrential reach did not have a negative exponential longitudinal profile, in contrast to that usually observed for mountain rivers. This was attributed to the large quantity of heterometric sediment derived from the hillslopes, which resulted in no marked decline in sediment size and consequent change in the longitudinal profile. A recent trend of scouring was detected, reflecting the reduction in sediment supply following farmland abandonment and reforestation, which have reduced connectivity between the hillslopes and the channel.
publishDate 2014
dc.date.none.fl_str_mv 2014
dc.type.none.fl_str_mv info:eu-repo/semantics/article
Subtype: Article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://investigacion.unirioja.es/documentos/5bbc5d02b7506047d09b5d41
url https://investigacion.unirioja.es/documentos/5bbc5d02b7506047d09b5d41
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.18172/CIG.2566
info:eu-repo/semantics/altIdentifier/pissn/0211-6820
info:eu-repo/semantics/altIdentifier/eissn/1697-9540
Sediment organization and adjustment in a torrential reach of the upper Ijuez river, central Spanish Pyrenees, 2014, vol. 40, núm. 1, pág. 191-214
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidad de La Rioja
publisher.none.fl_str_mv Universidad de La Rioja
dc.source.none.fl_str_mv reponame:RIUR. Repositorio Institucional de la Universidad de La Rioja
instname:Universidad de La Rioja (UR)
instname_str Universidad de La Rioja (UR)
reponame_str RIUR. Repositorio Institucional de la Universidad de La Rioja
collection RIUR. Repositorio Institucional de la Universidad de La Rioja
repository.name.fl_str_mv
repository.mail.fl_str_mv
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spelling Sediment organization and adjustment in a torrential reach of the upper Ijuez river, central Spanish PyreneesGómez-Villar, Amelia [0000-0002-0061-8017]Sanjuan, Yasmina [0000-0003-4400-4444]García Ruiz, José María [0000-0002-8535-817X]Nadal Romero, María Estela [0000-0002-4651-7828]Álvarez Martínez, Javier [0000-0002-0861-2840]Arnáez Vadillo, José [0000-0001-8248-5272]Serrano Muela, María PilarThe dynamics of the torrential upper reach of the Ijuez River, Central Spanish Pyrenees, was analyzed in relation to the spatial organization of grain size. The reach is located in the Eocene flysch, which usually acts as a high sediment production area, particularly during periods of intense human activity. The Ijuez Valley was cultivated and densely populated until the middle of the 20th century, resulting in general deforestation and the development of debris flows, shallow landslides, sheet wash erosion and deep gullies. As a consequence, the alluvial plain became characterized by the presence of large quantities of coarse sediment. The spatial organization of sediment showed a progressive downstream decline in the cobble and boulder size, especially in the channel, whereas the remainder of the alluvial plain showed large variability. No trend in the occurrence of the largest boulders was evident throughout the reach, confirming the importance of debris and hyperconcentrated flows in sediment transport. The torrential reach did not have a negative exponential longitudinal profile, in contrast to that usually observed for mountain rivers. This was attributed to the large quantity of heterometric sediment derived from the hillslopes, which resulted in no marked decline in sediment size and consequent change in the longitudinal profile. A recent trend of scouring was detected, reflecting the reduction in sediment supply following farmland abandonment and reforestation, which have reduced connectivity between the hillslopes and the channel.Se estudia un tramo torrencial en la cabecera del río Ijuez, Pirineo central español, con el fin de analizar su dinámica en relación con la distribución espacial de los sedimentos. Este tramo se instala en el flysch eoceno, que habitualmente se comporta como altamente productor de sedimento, especialmente en condiciones de intensa actividad humana. El valle del río Ijuez fue cultivado y densamente poblado hasta mediados del siglo XX, causando la eliminación de la mayoría de los bosques y dando lugar a flujos de derrubios (debris flows), deslizamientos superficiales, erosión difusa y formación de barrancos muy activos. La consecuencia fue el desarrollo de una llanura aluvial caracterizada por el escombrado de grandes volúmenes de sedimento grueso. La organización espacial de los sedimentos muestra un progresivo descenso en el tamaño de los cantos, especialmente en el cauce actual, y mucho menos en el resto de la llanura aluvial, donde la variabilidad es muy grande. Los grandes bloques no presentan ninguna tendencia a lo largo del curso, reflejando la importancia de los flujos de derrubios e hiperconcentrados en el transporte de sedimento. El tramo torrencial estudiado no muestra un perfil longitudinal exponencial negativo, al contrario de lo que es habitual en los ríos de montaña. Este fenómeno se atribuye a la gran cantidad de sedimentos heterométricos que llegan masivamente desde las laderas, que impiden un marcado descenso en el tamaño del sedimento y el consiguiente ajuste del perfil longitudinal. Se ha detectado una tendencia reciente hacia la incisión del río en sus propios sedimentos, reflejando la reducción en el aporte de estos últimos debido al abandono de tierras y la reforestación, limitando la conectividad entre laderas y cauce.Universidad de La Rioja2014info:eu-repo/semantics/articleSubtype: Articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://investigacion.unirioja.es/documentos/5bbc5d02b7506047d09b5d41reponame:RIUR. Repositorio Institucional de la Universidad de La Riojainstname:Universidad de La Rioja (UR)Inglésinfo:eu-repo/semantics/altIdentifier/doi/10.18172/CIG.2566info:eu-repo/semantics/altIdentifier/pissn/0211-6820info:eu-repo/semantics/altIdentifier/eissn/1697-9540Sediment organization and adjustment in a torrential reach of the upper Ijuez river, central Spanish Pyrenees, 2014, vol. 40, núm. 1, pág. 191-214info:eu-repo/semantics/openAccessoai:portal.dialnet.es:doc/5bbc5d02b7506047d09b5d412026-06-14T12:47:17Z
score 15,301603

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