Evaluating fine sediment mobilization and storage in a gravel‐bed river using controlled reservoir releases
Identifieur interne : 001969 ( Istex/Corpus ); précédent : 001968; suivant : 001970Evaluating fine sediment mobilization and storage in a gravel‐bed river using controlled reservoir releases
Auteurs : E. L. Petticrew ; A. Krein ; D. E. WallingSource :
- Hydrological Processes [ 0885-6087 ] ; 2007-01-15.
English descriptors
- KwdEn :
Abstract
Two controlled flow events were generated by releasing water from a reservoir into the Olewiger Bach, located near Trier, Germany. This controlled release of near bank‐full flows allowed an investigation of the fine sediment (<63 µm) mobilized from channel storage. Both a winter (November) and a summer (June) release event were generated, each having very different antecedent flow conditions. The characteristics of the release hydrographs and the associated sediment transport indicated a reverse hysteresis with more mass, but smaller grain sizes, moving on the falling limb. Fine sediment stored to a depth of 10 cm in the gravels decreased following the release events, indicating the dynamic nature and importance of channel‐stored sediments as source materials during high flow events. Sediment traps, filled with clean natural gravel, were buried in riffles before the release of the reservoir water and the total mass of fine sediment collected by the traps was measured following the events. Twice the mass of fine sediment was retained by the gravel traps compared with the natural gravels, which may be due to their altered porosity. Although the amount of fine sediment collected by the traps was not significantly related to measures of gravel structure, it was found to be significantly correlated to measures of local flow velocity and Froude number. A portion of the traps were fitted with lids to restrict surface exchange of water and sediment. These collected the highest amounts of event‐mobilized sediments, indicating that inter‐gravel lateral flows, not just surface infiltration of sediments, are important in replenishing and redistributing the channel‐stored fines. These findings regarding the magnitude and direction of fine sediment movement in gravel beds are significant in both a geomorphic and a biological context. Copyright © 2006 John Wiley & Sons, Ltd.
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DOI: 10.1002/hyp.6183
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ISTEX:12CD7BE2EA77FCC9E748216C6A76D05CE3837DCFLe document en format XML
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Petticrew</name><affiliation><mods:affiliation>School of Geography, University of Plymouth, Plymouth, Devon, UK</mods:affiliation></affiliation><affiliation><mods:affiliation>Geography Program, University of Northern British Columbia, 3333 University Way, Prince George, British Columbia, Canada, V2N 4Z9.===</mods:affiliation></affiliation></author><author><name sortKey="Krein, A" sort="Krein, A" uniqKey="Krein A" first="A." last="Krein">A. Krein</name><affiliation><mods:affiliation>Department of Environment and Agro‐Biotechnologies, Public Research Centre Gabriel Lippmann, Belvaux, Grand Duchy of Luxembourg</mods:affiliation></affiliation></author><author><name sortKey="Walling, D E" sort="Walling, D E" uniqKey="Walling D" first="D. E." last="Walling">D. E. 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This controlled release of near bank‐full flows allowed an investigation of the fine sediment (<63 µm) mobilized from channel storage. Both a winter (November) and a summer (June) release event were generated, each having very different antecedent flow conditions. The characteristics of the release hydrographs and the associated sediment transport indicated a reverse hysteresis with more mass, but smaller grain sizes, moving on the falling limb. Fine sediment stored to a depth of 10 cm in the gravels decreased following the release events, indicating the dynamic nature and importance of channel‐stored sediments as source materials during high flow events. Sediment traps, filled with clean natural gravel, were buried in riffles before the release of the reservoir water and the total mass of fine sediment collected by the traps was measured following the events. Twice the mass of fine sediment was retained by the gravel traps compared with the natural gravels, which may be due to their altered porosity. Although the amount of fine sediment collected by the traps was not significantly related to measures of gravel structure, it was found to be significantly correlated to measures of local flow velocity and Froude number. A portion of the traps were fitted with lids to restrict surface exchange of water and sediment. These collected the highest amounts of event‐mobilized sediments, indicating that inter‐gravel lateral flows, not just surface infiltration of sediments, are important in replenishing and redistributing the channel‐stored fines. These findings regarding the magnitude and direction of fine sediment movement in gravel beds are significant in both a geomorphic and a biological context. Copyright © 2006 John Wiley & Sons, Ltd.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>E. L. Petticrew</name><affiliations><json:string>School of Geography, University of Plymouth, Plymouth, Devon, UK</json:string><json:string>Geography Program, University of Northern British Columbia, 3333 University Way, Prince George, British Columbia, Canada, V2N 4Z9.===</json:string></affiliations></json:item><json:item><name>A. Krein</name><affiliations><json:string>Department of Environment and Agro‐Biotechnologies, Public Research Centre Gabriel Lippmann, Belvaux, Grand Duchy of Luxembourg</json:string></affiliations></json:item><json:item><name>D. E. Walling</name><affiliations><json:string>Department of Geography, University of Exeter, Exeter, Devon, UK</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>fine sediment</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>sediment mobilization</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>channel bed storage</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>infiltration rates</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>controlled release events</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>artificial floods</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>sediment traps</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>sediment transport</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>gravel‐bed rivers</value></json:item></subject><articleId><json:string>HYP6183</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><abstract>Two controlled flow events were generated by releasing water from a reservoir into the Olewiger Bach, located near Trier, Germany. This controlled release of near bank‐full flows allowed an investigation of the fine sediment (>63 µm) mobilized from channel storage. Both a winter (November) and a summer (June) release event were generated, each having very different antecedent flow conditions. The characteristics of the release hydrographs and the associated sediment transport indicated a reverse hysteresis with more mass, but smaller grain sizes, moving on the falling limb. Fine sediment stored to a depth of 10 cm in the gravels decreased following the release events, indicating the dynamic nature and importance of channel‐stored sediments as source materials during high flow events. Sediment traps, filled with clean natural gravel, were buried in riffles before the release of the reservoir water and the total mass of fine sediment collected by the traps was measured following the events. Twice the mass of fine sediment was retained by the gravel traps compared with the natural gravels, which may be due to their altered porosity. Although the amount of fine sediment collected by the traps was not significantly related to measures of gravel structure, it was found to be significantly correlated to measures of local flow velocity and Froude number. A portion of the traps were fitted with lids to restrict surface exchange of water and sediment. These collected the highest amounts of event‐mobilized sediments, indicating that inter‐gravel lateral flows, not just surface infiltration of sediments, are important in replenishing and redistributing the channel‐stored fines. These findings regarding the magnitude and direction of fine sediment movement in gravel beds are significant in both a geomorphic and a biological context. 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a gravel‐bed river using controlled reservoir releases</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>John Wiley & Sons, Ltd.</publisher><pubPlace>Chichester, UK</pubPlace><availability><p>Copyright © 2006 John Wiley & Sons, Ltd.</p></availability><date>2007</date></publicationStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">Evaluating fine sediment mobilization and storage in a gravel‐bed river using controlled reservoir releases</title><author xml:id="author-1"><persName><forename type="first">E. L.</forename><surname>Petticrew</surname></persName><affiliation>School of Geography, University of Plymouth, Plymouth, Devon, UK</affiliation><affiliation>Geography Program, University of Northern British Columbia, 3333 University Way, Prince George, British Columbia, Canada, V2N 4Z9.===</affiliation></author><author xml:id="author-2"><persName><forename type="first">A.</forename><surname>Krein</surname></persName><affiliation>Department of Environment and Agro‐Biotechnologies, Public Research Centre Gabriel Lippmann, Belvaux, Grand Duchy of Luxembourg</affiliation></author><author xml:id="author-3"><persName><forename type="first">D. E.</forename><surname>Walling</surname></persName><affiliation>Department of Geography, University of Exeter, Exeter, Devon, UK</affiliation></author></analytic><monogr><title level="j">Hydrological Processes</title><title level="j" type="sub">An International Journal</title><title level="j" type="abbrev">Hydrol. 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Twice the mass of fine sediment was retained by the gravel traps compared with the natural gravels, which may be due to their altered porosity. Although the amount of fine sediment collected by the traps was not significantly related to measures of gravel structure, it was found to be significantly correlated to measures of local flow velocity and Froude number. A portion of the traps were fitted with lids to restrict surface exchange of water and sediment. These collected the highest amounts of event‐mobilized sediments, indicating that inter‐gravel lateral flows, not just surface infiltration of sediments, are important in replenishing and redistributing the channel‐stored fines. These findings regarding the magnitude and direction of fine sediment movement in gravel beds are significant in both a geomorphic and a biological context. 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This controlled release of near bank‐full flows allowed an investigation of the fine sediment (<63 µm) mobilized from channel storage. Both a winter (November) and a summer (June) release event were generated, each having very different antecedent flow conditions. The characteristics of the release hydrographs and the associated sediment transport indicated a reverse hysteresis with more mass, but smaller grain sizes, moving on the falling limb. Fine sediment stored to a depth of 10 cm in the gravels decreased following the release events, indicating the dynamic nature and importance of channel‐stored sediments as source materials during high flow events. Sediment traps, filled with clean natural gravel, were buried in riffles before the release of the reservoir water and the total mass of fine sediment collected by the traps was measured following the events. Twice the mass of fine sediment was retained by the gravel traps compared with the natural gravels, which may be due to their altered porosity. Although the amount of fine sediment collected by the traps was not significantly related to measures of gravel structure, it was found to be significantly correlated to measures of local flow velocity and Froude number. A portion of the traps were fitted with lids to restrict surface exchange of water and sediment. These collected the highest amounts of event‐mobilized sediments, indicating that inter‐gravel lateral flows, not just surface infiltration of sediments, are important in replenishing and redistributing the channel‐stored fines. These findings regarding the magnitude and direction of fine sediment movement in gravel beds are significant in both a geomorphic and a biological context. Copyright © 2006 John Wiley & Sons, Ltd.</abstract><subject lang="en"><genre>keywords</genre><topic>fine sediment</topic><topic>sediment mobilization</topic><topic>channel bed storage</topic><topic>infiltration rates</topic><topic>controlled release events</topic><topic>artificial floods</topic><topic>sediment traps</topic><topic>sediment transport</topic><topic>gravel‐bed rivers</topic></subject><relatedItem type="host"><titleInfo><title>Hydrological Processes</title><subTitle>An International Journal</subTitle></titleInfo><titleInfo type="abbreviated"><title>Hydrol. 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