<div class="csl-bib-body">
<div class="csl-entry">Thorez, S., Lemmin, U., D. Andrew Barry, & Blanckaert, K. (2024, April 19). <i>Quantifying Turbulent Mixing in Plunging River Inflows: Insights from Field Measurements in Lake Geneva</i> [Conference Presentation]. EGU General Assembly 2024, Wien, Austria. https://doi.org/10.5194/egusphere-egu24-17856</div>
</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/208216
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dc.description.abstract
Hyperpycnal river inflows discharging into lakes or reservoirs will plunge and trigger gravity-driven underflows near the bed. Such underflows are called turbidity currents if the density excess is mainly caused by a high sediment concentration. These underflows can reach the bottom of the lake or, alternatively, detach from the bed and intrude horizontally into the lake waters to form an interflow if a layer of equal density is encountered. As underflows carry a number of constituents fed to them by the river or eroded from the bed, such as sediment, contaminants, nutrients and oxygen, their pathway and final destination have an impact on lake or reservoir water quality. The mixing processes in the plunging region are known to be of dominant importance for the dilution of the inflowing river water by entrainment of ambient water, thereby exerting a primary control on the final intrusion depth of underflows. Understanding and quantifying these processes is therefore key. Until now, the majority of estimations of the mixing extent in the plunging region were made within laterally confined laboratory experiments or via passive tracer methodologies. This study focuses on quantifying plunging mixing from flow velocity measurements in a laterally unconfined river inflow in the field and investigating its dependency on inflow conditions.
Field measurements of the plunging Rhône River entering Lake Geneva were conducted using a boat-towed ADCP along a grid of transects for six inflow conditions characterized by the inflow densimetric Froude number Frd. The plunging mixing coefficient Ep, which compares the underflow discharge immediately post-plunging to the initial river inflow discharge, was used to quantify the plunging mixing.
Results indicate that for larger Frd values (Frd > 4) Ep estimates align with laterally confined lab experiments (Ep = O(0.1)). Conversely, for smaller Frd values Ep estimates correlate with field tracer measurements of laterally unconfined inflows (Ep = O(1)). Ep decreases with increasing Frd, challenging existing numerical simulations predicting the opposite relationship.
This study offers key insights into turbulent mixing rates associated with hyperpycnal river inflows and highlights the need to incorporate realistic field conditions for accurate modeling of plunging river inflows and intrusion depth.
en
dc.description.sponsorship
FWF - Österr. Wissenschaftsfonds
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dc.language.iso
en
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dc.subject
ADCP
en
dc.subject
hyperpycnal
en
dc.subject
plunging
en
dc.subject
river plume
en
dc.subject
mixing
en
dc.subject
turbidity current
en
dc.subject
gravity current
en
dc.title
Quantifying Turbulent Mixing in Plunging River Inflows: Insights from Field Measurements in Lake Geneva
en
dc.type
Presentation
en
dc.type
Vortrag
de
dc.contributor.affiliation
École Polytechnique Fédérale de Lausanne, Switzerland
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dc.contributor.affiliation
École Polytechnique Fédérale de Lausanne, Switzerland
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dc.relation.grantno
I 6180-N
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dc.type.category
Conference Presentation
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tuw.project.title
Hyperpycnal sedimentladen river plumes in lakes
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tuw.researchTopic.id
C2
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tuw.researchTopic.id
E4
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tuw.researchTopic.name
Computational Fluid Dynamics
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tuw.researchTopic.name
Environmental Monitoring and Climate Adaptation
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tuw.researchTopic.value
30
-
tuw.researchTopic.value
70
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tuw.publication.orgunit
E222-01 - Forschungsbereich Wasserbau und Umwelthydraulik
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tuw.publisher.doi
10.5194/egusphere-egu24-17856
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tuw.author.orcid
0000-0002-2282-2449
-
tuw.author.orcid
0000-0001-8561-0665
-
tuw.author.orcid
0000-0002-8621-0425
-
tuw.author.orcid
0000-0002-6630-3683
-
tuw.event.name
EGU General Assembly 2024
en
tuw.event.startdate
14-04-2024
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tuw.event.enddate
19-04-2024
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tuw.event.online
Hybrid
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tuw.event.type
Event for scientific audience
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tuw.event.place
Wien
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tuw.event.country
AT
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tuw.event.institution
European Geosciences Union
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tuw.event.presenter
Thorez, Stan
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tuw.event.track
Multi Track
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wb.sciencebranch
Bauingenieurwesen
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wb.sciencebranch
Umwelttechnik
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wb.sciencebranch
Hydrologie
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wb.sciencebranch.oefos
2011
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wb.sciencebranch.oefos
2071
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wb.sciencebranch.oefos
1053
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wb.sciencebranch.value
30
-
wb.sciencebranch.value
20
-
wb.sciencebranch.value
50
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item.cerifentitytype
Publications
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item.languageiso639-1
en
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item.fulltext
no Fulltext
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item.openairetype
conference paper not in proceedings
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item.openairecristype
http://purl.org/coar/resource_type/c_18cp
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item.grantfulltext
restricted
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crisitem.project.funder
FWF - Österr. Wissenschaftsfonds
-
crisitem.project.grantno
I 6180-N
-
crisitem.author.dept
E222-01 - Forschungsbereich Wasserbau
-
crisitem.author.dept
École Polytechnique Fédérale de Lausanne
-
crisitem.author.dept
École Polytechnique Fédérale de Lausanne
-
crisitem.author.dept
E222-01 - Forschungsbereich Wasserbau
-
crisitem.author.orcid
0000-0002-2282-2449
-
crisitem.author.orcid
0000-0001-8561-0665
-
crisitem.author.orcid
0000-0002-8621-0425
-
crisitem.author.orcid
0000-0002-6630-3683
-
crisitem.author.parentorg
E222 - Institut für Wasserbau und Ingenieurhydrologie
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crisitem.author.parentorg
E222 - Institut für Wasserbau und Ingenieurhydrologie
