AustralieFrV1, Main, Exploration, bibRecord, 00B740

Estimating residence times of fine sediment in river channels using fallout 210Pb

Identifieur interne : 00B740 ( Main/Exploration ); précédent : 00B739; suivant : 00B741

Estimating residence times of fine sediment in river channels using fallout 210Pb

Auteurs : Peter Wallbrink [Australie] ; Jon M. Olley [Australie] ; Gary Hancock [Australie]

Source :

IAHS-AISH publication [ 0144-7815 ] ; 2002.

RBID : Pascal:03-0412924

Descripteurs français

Pascal (Inist)
- Queensland, Temps résidence, Sédiment, Fraction fine, Chenal, Rivière, Retombée, Méthodologie, Epaisseur, Radionucléide, Pb 210, Utilisation terrain, Gestion, Bassin versant, Plomb, Césium, Cs 137, Rivière Brisbane, Rivière Logan.
Wicri :
- topic : Gestion, Plomb.

English descriptors

KwdEn :
- Cs-137, Pb-210, Queensland Australia, cesium, channels, drainage basins, fallout, fine-grained materials, land use, lead, management, methodology, radionucleids, residence time, rivers, sediments, thickness.

Abstract

The residence time of fine-grained sediment (<10 μm diameter) within river channels is often assumed to be short, and has been rarely quantified. Here we investigate a new approach to estimate residence times of such material. Fine-grained sediments collected from along the Brisbane River, Queensland, Australia, have higher excess ²¹⁰Pb activities and ²¹⁰Pb/¹³⁷Cs ratios than sediment eroded from uncultivated, cultivated and channel bank sources in the catchment. We explore the possibility that these higher ²¹⁰Pb activities are related to residence of the sediment within the channel and propose a method for using this data to make a residence time calculation. The method gave a range of residence times of 0-21 years for the Brisbane sediments. Data from the adjacent Logan River system provide a range of 0-9 years, although both ranges were dependent on a number of assumptions regarding sediment thickness and ²¹⁰Pb fallout rates and amounts.

Affiliations:

Australie

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to stream PascalFrancis, to step Corpus: 005248
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to stream Main, to step Merge: 00C563
to stream Main, to step Curation: 00B740

Le document en format XML

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<term>Retombée</term>
<term>Méthodologie</term>
<term>Epaisseur</term>
<term>Radionucléide</term>
<term>Pb 210</term>
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<front><div type="abstract" xml:lang="en">The residence time of fine-grained sediment (<10 μm diameter) within river channels is often assumed to be short, and has been rarely quantified. Here we investigate a new approach to estimate residence times of such material. Fine-grained sediments collected from along the Brisbane River, Queensland, Australia, have higher excess <sup>210</sup>
Pb activities and <sup>210</sup>
Pb/<sup>137</sup>
Cs ratios than sediment eroded from uncultivated, cultivated and channel bank sources in the catchment. We explore the possibility that these higher <sup>210</sup>
Pb activities are related to residence of the sediment within the channel and propose a method for using this data to make a residence time calculation. The method gave a range of residence times of 0-21 years for the Brisbane sediments. Data from the adjacent Logan River system provide a range of 0-9 years, although both ranges were dependent on a number of assumptions regarding sediment thickness and <sup>210</sup>
Pb fallout rates and amounts.</div>
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Estimating residence times of fine sediment in river channels using fallout 210Pb

Estimating residence times of fine sediment in river channels using fallout 210Pb

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri