Treating causes not symptoms: restoration of surface-groundwater interactions in rivers
Identifieur interne : 008003 ( Main/Exploration ); précédent : 008002; suivant : 008004Treating causes not symptoms: restoration of surface-groundwater interactions in rivers
Auteurs : Tamao Kasahara [États-Unis] ; Thibault Datry [France] ; Michael Mutz [Allemagne] ; Andrew J. Boulton [Australie]Source :
- Marine and freshwater research [ 1323-1650 ] ; 2009.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Eau souterraine, Milieu aquatique.
English descriptors
- KwdEn :
Abstract
Many river restoration projects seek to address issues associated with impaired hydrological and ecological connectivity in longitudinal (e.g. effects of dams, weirs) or lateral (e.g. alienated floodplain) dimensions. Efforts to restore the vertical dimension of impaired stream-groundwater exchange are rare, hampered by limited understanding of the factors controlling this linkage in natural alluvial rivers. We propose a simplified two-axis model of the 'primary drivers' (sediment structure and vertical hydraulic gradient) of stream-groundwater exchange that acknowledges their interaction and provides a practical template to help researchers and river managers pose hypothesis-driven solutions to restoration of damaged or lost vertical connectivity. Many human activities impact on one or both of these drivers, and we review some of the tools available for treating the causes (rather than symptoms) in impacted stream reaches. For example, creating riffle-pool sequences along stream reaches will enhance vertical hydraulic gradient, whereas flushing flows can remove clogging layers and sustain sediment permeability. Our model is a first step to specifying mechanisms for recovery of lost vertical connectivity. Assessing results of river restoration using this approach at reach to catchment scales will provide scientific insights into the interplay of hydrology, fluvial geomorphology and river ecosystem function at appropriately broad scales.
Affiliations:
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Boulton</name><affiliation wicri:level="1"><inist:fA14 i1="04"><s1>Ecosystem Management, University of New England</s1><s2>Armidale, NSW 2351</s2><s3>AUS</s3><sZ>4 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Armidale, NSW 2351</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Marine and freshwater research</title><title level="j" type="abbreviated">Mar. freshw. res.</title><idno type="ISSN">1323-1650</idno><imprint><date when="2009">2009</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Marine and freshwater research</title><title level="j" type="abbreviated">Mar. freshw. res.</title><idno type="ISSN">1323-1650</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Aquatic environment</term><term>Conservation</term><term>Ecological recovery</term><term>Ecosystem health</term><term>Exchange</term><term>Ground water</term><term>Hyporheal zone</term><term>Interaction</term><term>Rivers</term><term>Sediments</term><term>Stream</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Restauration milieu</term><term>Eau souterraine</term><term>Interaction</term><term>Rivière</term><term>Cours eau</term><term>Conservation</term><term>Echange</term><term>Milieu hyporhéique</term><term>Sédiment</term><term>Milieu aquatique</term><term>Santé écosystème</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Eau souterraine</term><term>Milieu aquatique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Many river restoration projects seek to address issues associated with impaired hydrological and ecological connectivity in longitudinal (e.g. effects of dams, weirs) or lateral (e.g. alienated floodplain) dimensions. Efforts to restore the vertical dimension of impaired stream-groundwater exchange are rare, hampered by limited understanding of the factors controlling this linkage in natural alluvial rivers. We propose a simplified two-axis model of the 'primary drivers' (sediment structure and vertical hydraulic gradient) of stream-groundwater exchange that acknowledges their interaction and provides a practical template to help researchers and river managers pose hypothesis-driven solutions to restoration of damaged or lost vertical connectivity. Many human activities impact on one or both of these drivers, and we review some of the tools available for treating the causes (rather than symptoms) in impacted stream reaches. For example, creating riffle-pool sequences along stream reaches will enhance vertical hydraulic gradient, whereas flushing flows can remove clogging layers and sustain sediment permeability. Our model is a first step to specifying mechanisms for recovery of lost vertical connectivity. Assessing results of river restoration using this approach at reach to catchment scales will provide scientific insights into the interplay of hydrology, fluvial geomorphology and river ecosystem function at appropriately broad scales.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>Australie</li><li>France</li><li>États-Unis</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Rhône-Alpes</li></region><settlement><li>Lyon</li></settlement></list><tree><country name="États-Unis"><noRegion><name sortKey="Kasahara, Tamao" sort="Kasahara, Tamao" uniqKey="Kasahara T" first="Tamao" last="Kasahara">Tamao Kasahara</name></noRegion></country><country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Datry, Thibault" sort="Datry, Thibault" uniqKey="Datry T" first="Thibault" last="Datry">Thibault Datry</name></region></country><country name="Allemagne"><noRegion><name sortKey="Mutz, Michael" sort="Mutz, Michael" uniqKey="Mutz M" first="Michael" last="Mutz">Michael Mutz</name></noRegion></country><country name="Australie"><noRegion><name sortKey="Boulton, Andrew J" sort="Boulton, Andrew J" uniqKey="Boulton A" first="Andrew J." last="Boulton">Andrew J. 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