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dc.contributor.author
Reesink, Arnold J.
dc.contributor.author
Ashworth, Philip J.
dc.contributor.author
Sambrook Smith, Gregory H.
dc.contributor.author
Best, James L.
dc.contributor.author
Parsons, Daniel R.
dc.contributor.author
Amsler, Mario Luis
dc.contributor.author
Hardy, Richard J.
dc.contributor.author
Lane, Stuart N.
dc.contributor.author
Nicholas, Andrew P.
dc.contributor.author
Orfeo, Oscar
dc.contributor.author
Sandbach, Stevend D.
dc.contributor.author
Simpson, Christopher J.
dc.contributor.author
Szupiany, Ricardo Nicolas
dc.date.available
2017-10-02T14:30:03Z
dc.date.issued
2014-06
dc.identifier.citation
Reesink, Arnold J.; Ashworth, Philip J.; Sambrook Smith, Gregory H.; Best, James L.; Parsons, Daniel R.; et al.; Scales and causes of heterogeneity in bars in a large multi-channel river: Río Paraná, Argentina; Wiley; Sedimentology; 61; 4; 6-2014; 1055-1085
dc.identifier.issn
0037-0746
dc.identifier.uri
http://hdl.handle.net/11336/25552
dc.description.abstract
To date, published studies of alluvial bar architecture in large rivers have been restricted mostly to case studies of individual bars and single locations. Relatively little is known about how the depositional processes and sedimentary architecture of kilometre-scale bars vary within a multi-kilometre reach or over several hundreds of kilometres downstream. This study presents Ground Penetrating Radar and core data from 11, kilometre-scale bars from the Río Paraná, Argentina. The investigated bars are located between 30 km upstream and 540 km downstream of the Río Paraná – Río Paraguay confluence, where a significant volume of fine-grained suspended sediment is introduced into the network. Bar-scale cross-stratified sets, with lengths and widths up to 600 m and thicknesses up to 12 m, enable the distinction of large river deposits from stacked deposits of smaller rivers, but are only present in half the surface area of the bars. Up to 90% of bar-scale sets are found on top of finer-grained ripple-laminated bar-trough deposits. Bar-scale sets make up as much as 58% of the volume of the deposits in small, incipient mid-channel bars, but this proportion decreases significantly with increasing age and size of the bars. Contrary to what might be expected, a significant proportion of the sedimentary structures found in the Río Paraná is similar in scale to those found in much smaller rivers. In other words, large river deposits are not always characterized by big structures that allow a simple interpretation of river scale. However, the large scale of the depositional units in big rivers causes small-scale structures, such as ripple sets, to be grouped into thicker cosets, which indicate river scale even when no obvious large-scale sets are present. The results also show that the composition of bars differs between the studied reaches upstream and downstream of the confluence with the Río Paraguay. Relative to other controls on downstream fining, the tributary input of fine-grained suspended material from the Río Paraguay causes a marked change in the composition of the bar deposits. Compared to the upstream reaches, the sedimentary architecture of the downstream reaches in the top ca 5 m of mid-channel bars shows: (i) an increase in the abundance and thickness (up to metre-scale) of laterally extensive (hundreds of metres) fine-grained layers; (ii) an increase in the percentage of deposits comprised of ripple sets (to >40% in the upper bar deposits); and (iii) an increase in bar-trough deposits and a corresponding decrease in bar-scale cross-strata (<10%). The thalweg deposits of the Río Paraná are composed of dune sets, even directly downstream from the Río Paraguay where the upper channel deposits are dominantly fine-grained. Thus, the change in sedimentary facies due to a tributary point-source of fine-grained sediment is primarily expressed in the composition of the upper bar deposits.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Bars
dc.subject
Channel Deposits
dc.subject
Dunes
dc.subject
Facies Model
dc.subject
Gpr
dc.subject
Large Rivers
dc.subject
Río Paraná
dc.subject.classification
Oceanografía, Hidrología, Recursos Hídricos
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Scales and causes of heterogeneity in bars in a large multi-channel river: Río Paraná, Argentina
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-09-19T18:25:40Z
dc.journal.volume
61
dc.journal.number
4
dc.journal.pagination
1055-1085
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Reesink, Arnold J.. University Of Birmingham, School of Geography; Reino Unido
dc.description.fil
Fil: Ashworth, Philip J.. University of Brighton, School of Environment and Technology; Reino Unido
dc.description.fil
Fil: Sambrook Smith, Gregory H.. University of Birmingham, School of Geography; Reino Unido
dc.description.fil
Fil: Best, James L.. University Of Illinois At Urbana; Estados Unidos
dc.description.fil
Fil: Parsons, Daniel R.. University Of Hull; Reino Unido
dc.description.fil
Fil: Amsler, Mario Luis. Universidad Nacional del Litoral. Facultad de Ingeniería y Ciencias Hídricas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Hardy, Richard J.. University Of Durham; Reino Unido
dc.description.fil
Fil: Lane, Stuart N.. Universite de Lausanne; Suiza
dc.description.fil
Fil: Nicholas, Andrew P.. University Of Exeter; Reino Unido
dc.description.fil
Fil: Orfeo, Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentina
dc.description.fil
Fil: Sandbach, Stevend D.. University Of Exeter; Reino Unido
dc.description.fil
Fil: Simpson, Christopher J.. Fulcrum Graphic Communications Inc.; Canadá
dc.description.fil
Fil: Szupiany, Ricardo Nicolas. Universidad Nacional del Litoral. Facultad de Ingeniería y Ciencias Hídricas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title
Sedimentology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1111/sed.12092
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1111/sed.12092/abstract


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