Changes in the hydrodynamics of a mountain river induced by dam reservoir backwater

Upstream from a dam reservoir, river hydrodynamics may be directly changed by temporary inundation driven by the reservoir. This triggers morphological river changes which may additionally modify the initial hydrodynamics, even at the time when backwater inundation does not occur (indirect effects o...

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Autores: Liro, Maciej, Ruiz Villanueva, Virginia, Mikus, Pawel, Wyzga, Bartlomiej, Bladé i Castellet, Ernest|||0000-0003-1770-3960
Tipo de documento: artigo
Data de publicação:2020
País:España
Recursos:Universitat Politècnica de Catalunya (UPC)
Repositório:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglês
OAI Identifier:oai:upcommons.upc.edu:2117/329151
Acesso em linha:https://hdl.handle.net/2117/329151
https://dx.doi.org/10.1016/j.scitotenv.2020.140555
Access Level:Acceso aberto
Palavra-chave:Hydrodynamics--Mathematical models
Dam reservoir backwater
Hydraulic modelling
River hydrodynamics
Mountain river
Hidrodinàmica -- Models matemàtics
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Hidrologia
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spelling Changes in the hydrodynamics of a mountain river induced by dam reservoir backwaterLiro, MaciejRuiz Villanueva, VirginiaMikus, PawelWyzga, BartlomiejBladé i Castellet, Ernest|||0000-0003-1770-3960Hydrodynamics--Mathematical modelsDam reservoir backwaterHydraulic modellingRiver hydrodynamicsMountain riverHidrodinàmica -- Models matemàticsÀrees temàtiques de la UPC::Enginyeria civil::Geologia::HidrologiaUpstream from a dam reservoir, river hydrodynamics may be directly changed by temporary inundation driven by the reservoir. This triggers morphological river changes which may additionally modify the initial hydrodynamics, even at the time when backwater inundation does not occur (indirect effects of backwater). We verified these hypotheses, applying two-dimensional hydraulic modelling of flood flows to a section of the mountainous Dunajec River upstream from the Czorsztyn Reservoir. The modelling was performed for small, medium and large floods, and hydraulic conditions were compared between the scenarios with lacking and maximum backwater inundation and between the river reaches subjected to backwater inundation and unaffected by backwater fluctuations. Direct effects of reservoir level fluctuations were limited to the reach subjected to backwater inundation during floods and comprised: significantly increased water depth and decreased flow velocity and bed shear stress in the channel and on the floodplain, as well as a re-established hydrological connectivity between the channel and floodplain during small and medium floods. Indirect effects of backwater inundation reflected channel widening and bed aggradation that triggered a positive feedback with changes in hydrodynamics, mostly by reducing the velocity of flood flows in the channel zone. These latter changes occurred on a longer distance upstream from the reservoir than the backwater reach itself, and they modified the river hydrodynamics even when backwater inundation did not occur. We propose a conceptual model which indicates that changes of mountain rivers upstream from dam reservoirs are driven by modified hydrodynamics and lead to different morphological adjustments than those induced by waters underloaded with sediment downstream from dams. Changes in hydrodynamics and the associated morphological and sedimentary adjustments of mountain rivers recorded upstream from dam reservoirs may locally mitigate impacts of channelization and channel incision on riverine and riparian ecosystems of these rivers.The study was performed within the scope of the Research Project 2015/19/N/ST10/01526 financed by the National Science Centre of Poland. The Czorsztyn–Niedzica Hydropower Plant Inc. provided the data on reservoir water stages. We thank two anonymous reviewers for their critical comments on the manuscript.Peer ReviewedElsevier20202020-11-0120202020-09-22journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/329151https://dx.doi.org/10.1016/j.scitotenv.2020.140555reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivatives 4.0 Internationalhttps://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/3291512026-05-27T15:37:01Z
dc.title.none.fl_str_mv Changes in the hydrodynamics of a mountain river induced by dam reservoir backwater
title Changes in the hydrodynamics of a mountain river induced by dam reservoir backwater
spellingShingle Changes in the hydrodynamics of a mountain river induced by dam reservoir backwater
Liro, Maciej
Hydrodynamics--Mathematical models
Dam reservoir backwater
Hydraulic modelling
River hydrodynamics
Mountain river
Hidrodinàmica -- Models matemàtics
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Hidrologia
title_short Changes in the hydrodynamics of a mountain river induced by dam reservoir backwater
title_full Changes in the hydrodynamics of a mountain river induced by dam reservoir backwater
title_fullStr Changes in the hydrodynamics of a mountain river induced by dam reservoir backwater
title_full_unstemmed Changes in the hydrodynamics of a mountain river induced by dam reservoir backwater
title_sort Changes in the hydrodynamics of a mountain river induced by dam reservoir backwater
dc.creator.none.fl_str_mv Liro, Maciej
Ruiz Villanueva, Virginia
Mikus, Pawel
Wyzga, Bartlomiej
Bladé i Castellet, Ernest|||0000-0003-1770-3960
author Liro, Maciej
author_facet Liro, Maciej
Ruiz Villanueva, Virginia
Mikus, Pawel
Wyzga, Bartlomiej
Bladé i Castellet, Ernest|||0000-0003-1770-3960
author_role author
author2 Ruiz Villanueva, Virginia
Mikus, Pawel
Wyzga, Bartlomiej
Bladé i Castellet, Ernest|||0000-0003-1770-3960
author2_role author
author
author
author
dc.subject.none.fl_str_mv Hydrodynamics--Mathematical models
Dam reservoir backwater
Hydraulic modelling
River hydrodynamics
Mountain river
Hidrodinàmica -- Models matemàtics
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Hidrologia
topic Hydrodynamics--Mathematical models
Dam reservoir backwater
Hydraulic modelling
River hydrodynamics
Mountain river
Hidrodinàmica -- Models matemàtics
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Hidrologia
description Upstream from a dam reservoir, river hydrodynamics may be directly changed by temporary inundation driven by the reservoir. This triggers morphological river changes which may additionally modify the initial hydrodynamics, even at the time when backwater inundation does not occur (indirect effects of backwater). We verified these hypotheses, applying two-dimensional hydraulic modelling of flood flows to a section of the mountainous Dunajec River upstream from the Czorsztyn Reservoir. The modelling was performed for small, medium and large floods, and hydraulic conditions were compared between the scenarios with lacking and maximum backwater inundation and between the river reaches subjected to backwater inundation and unaffected by backwater fluctuations. Direct effects of reservoir level fluctuations were limited to the reach subjected to backwater inundation during floods and comprised: significantly increased water depth and decreased flow velocity and bed shear stress in the channel and on the floodplain, as well as a re-established hydrological connectivity between the channel and floodplain during small and medium floods. Indirect effects of backwater inundation reflected channel widening and bed aggradation that triggered a positive feedback with changes in hydrodynamics, mostly by reducing the velocity of flood flows in the channel zone. These latter changes occurred on a longer distance upstream from the reservoir than the backwater reach itself, and they modified the river hydrodynamics even when backwater inundation did not occur. We propose a conceptual model which indicates that changes of mountain rivers upstream from dam reservoirs are driven by modified hydrodynamics and lead to different morphological adjustments than those induced by waters underloaded with sediment downstream from dams. Changes in hydrodynamics and the associated morphological and sedimentary adjustments of mountain rivers recorded upstream from dam reservoirs may locally mitigate impacts of channelization and channel incision on riverine and riparian ecosystems of these rivers.
publishDate 2020
dc.date.none.fl_str_mv 2020
2020-11-01
2020
2020-09-22
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/329151
https://dx.doi.org/10.1016/j.scitotenv.2020.140555
url https://hdl.handle.net/2117/329151
https://dx.doi.org/10.1016/j.scitotenv.2020.140555
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
https://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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