Permeability of small weirs for upstream fish passage

Detalhes bibliográficos
Autor(a) principal: Amaral, Susana Cristina Amador Dias
Data de Publicação: 2020
Idioma: eng
Título da fonte: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
Texto Completo: http://hdl.handle.net/10400.5/21202
Resumo: Doutoramento em Restauro e Gestão Fluviais - Instituto Superior de Agronomia / Faculdade de Arquitetura / Instituto Superior Técnico. Universidade de Lisboa
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network_name_str Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
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spelling Permeability of small weirs for upstream fish passageecohydraulicsriver connectivitypotamodromous cyprinids speciesmigratory movementssmall weirsDoutoramento em Restauro e Gestão Fluviais - Instituto Superior de Agronomia / Faculdade de Arquitetura / Instituto Superior Técnico. Universidade de LisboaRiver fragmentation is a serious threat to the sustainability of fish populations. Although far more numerous than dams, the impact of small weirs on fish migration have received less attention, for being considered permeable to fish movements. Nevertheless, the presence of small weirs may cause successive losses of connectivity by partially or totally blocking migratory routes. Potamodromous cyprinids are particularly impacted due to their need of undergoing seasonal upstream migrations. The goal of this thesis was to assess the effects of small weirs, particularly broad-crested and low-head ramped weirs, which are the most frequent designs in Iberian watercourses, on behaviour and passage performance of potamodromous cyprinids. A field assessment was performed to understand how these obstacles may affect, in an otherwise non-impacted stream, the movements of cyprinids. I addition to this field study, laboratorial experiments were carried out in an indoor flume. In these experiments, the influence of key hydraulic parameters – plunge pool depth, waterfall height, and weir crest width, in the case of broad-crested weirs; ramp length, and slope, for low-head ramped weirs, on passage performance of fish was tested across a range of discharges. Iberian barbel (Luciobarbus bocagei) was selected as target species. Main results suggest that barbel may cease to migrate, when suitable habitats exist between barriers. Regarding broad-crested weirs, it was found that i) fish passage was inhibited by shallow plunge pool depths in association with high waterfall heights; ii) passage behavior was dependent on combinations of plunge pool depths and waterfall heights; and iii) the width of the crest influenced downstream passages but not upstream ones. For ramped weirs, i) negotiation was conditioned by the increase of slope and ramp length; and ii) retrofitting ramped weirs with natural substrates like cobbles may increase permeability to fish movements. These outcomes are useful to identify potential migration obstacles and to help design more permeable structures to fish movementsISASantos, José Maria Horta e Costa SilvaFerreira, Maria TeresaPinheiro, António Alberto do NascimentoRepositório da Universidade de LisboaAmaral, Susana Cristina Amador Dias2021-04-05T10:37:31Z20202020-01-01T00:00:00Zdoctoral thesisinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10400.5/21202TID:101528124engAmaral, S.C.A.D. - Permeability of small weirs for upstream fish passage. Lisboa: ISA, 2020, 166 p.info:eu-repo/semantics/openAccessreponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiainstacron:RCAAP2025-03-17T16:10:23Zoai:repositorio.ulisboa.pt:10400.5/21202Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireinfo@rcaap.ptopendoar:https://opendoar.ac.uk/repository/71602025-05-29T04:04:51.708833Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiafalse
dc.title.none.fl_str_mv Permeability of small weirs for upstream fish passage
title Permeability of small weirs for upstream fish passage
spellingShingle Permeability of small weirs for upstream fish passage
Amaral, Susana Cristina Amador Dias
ecohydraulics
river connectivity
potamodromous cyprinids species
migratory movements
small weirs
title_short Permeability of small weirs for upstream fish passage
title_full Permeability of small weirs for upstream fish passage
title_fullStr Permeability of small weirs for upstream fish passage
title_full_unstemmed Permeability of small weirs for upstream fish passage
title_sort Permeability of small weirs for upstream fish passage
author Amaral, Susana Cristina Amador Dias
author_facet Amaral, Susana Cristina Amador Dias
author_role author
dc.contributor.none.fl_str_mv Santos, José Maria Horta e Costa Silva
Ferreira, Maria Teresa
Pinheiro, António Alberto do Nascimento
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Amaral, Susana Cristina Amador Dias
dc.subject.por.fl_str_mv ecohydraulics
river connectivity
potamodromous cyprinids species
migratory movements
small weirs
topic ecohydraulics
river connectivity
potamodromous cyprinids species
migratory movements
small weirs
description Doutoramento em Restauro e Gestão Fluviais - Instituto Superior de Agronomia / Faculdade de Arquitetura / Instituto Superior Técnico. Universidade de Lisboa
publishDate 2020
dc.date.none.fl_str_mv 2020
2020-01-01T00:00:00Z
2021-04-05T10:37:31Z
dc.type.driver.fl_str_mv doctoral thesis
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.5/21202
TID:101528124
url http://hdl.handle.net/10400.5/21202
identifier_str_mv TID:101528124
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Amaral, S.C.A.D. - Permeability of small weirs for upstream fish passage. Lisboa: ISA, 2020, 166 p.
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv ISA
publisher.none.fl_str_mv ISA
dc.source.none.fl_str_mv reponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron:RCAAP
instname_str FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron_str RCAAP
institution RCAAP
reponame_str Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
collection Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
repository.name.fl_str_mv Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
repository.mail.fl_str_mv info@rcaap.pt
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