Verification of the stationarity of flow series in the Iguaçu River basin

Detalhes bibliográficos
Autor(a) principal: Tozzi,Bruna Kiechaloski Miró
Data de Publicação: 2020
Outros Autores: Fill,Heinz Dieter Oskar August
Tipo de documento: Relatório
Idioma: eng
Título da fonte: RBRH (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312020000100402
Resumo: ABSTRACT The purpose of this technical note is to verify the stationarity of flows in the Iguaçu River Basin, considering 14 fluviometric stations. For this purpose, three sets of annual flow series were studied: mean flows, maximum flows and minimum flows of 7 days. Initially, the exploratory analysis of the data was performed, based on the establishment of two points of change of the characteristics of the flows and the accomplishment of statistical tests of equality of mean and variance, parametric and nonparametric. Finally, composite tests were used considering the basin divided into Upper and Lower Iguaçu. In the exploratory analysis of the data, it was concluded that there was apparently a change in the trend of flow rates, part in the 1970s, part in the 1980s. Therefore, the series were divided in two different ways, at the half and at the point suggested in the exploratory analysis. Regarding the statistical tests, the Mann-Whitney test was chosen because it did not depend on the underlying distribution of the flow series, and because the test was highly recommended by other authors. It was concluded that the flow change occurred in a relatively short interval of time, and could be treated as a non-stationarity per hop. In general, the most recent change was downstream of the Uniao da Vitória fluviometric station. A change in the behavior of the mean and maximum flows was evident, however, such phenomenon was not observed in the evaluation of the minimum flows.
id ABRH-1_be80b04466aca7b26496f33f5019ef4e
oai_identifier_str oai:scielo:S2318-03312020000100402
network_acronym_str ABRH-1
network_name_str RBRH (Online)
repository_id_str
spelling Verification of the stationarity of flow series in the Iguaçu River basinParametricStatisticTestsABSTRACT The purpose of this technical note is to verify the stationarity of flows in the Iguaçu River Basin, considering 14 fluviometric stations. For this purpose, three sets of annual flow series were studied: mean flows, maximum flows and minimum flows of 7 days. Initially, the exploratory analysis of the data was performed, based on the establishment of two points of change of the characteristics of the flows and the accomplishment of statistical tests of equality of mean and variance, parametric and nonparametric. Finally, composite tests were used considering the basin divided into Upper and Lower Iguaçu. In the exploratory analysis of the data, it was concluded that there was apparently a change in the trend of flow rates, part in the 1970s, part in the 1980s. Therefore, the series were divided in two different ways, at the half and at the point suggested in the exploratory analysis. Regarding the statistical tests, the Mann-Whitney test was chosen because it did not depend on the underlying distribution of the flow series, and because the test was highly recommended by other authors. It was concluded that the flow change occurred in a relatively short interval of time, and could be treated as a non-stationarity per hop. In general, the most recent change was downstream of the Uniao da Vitória fluviometric station. A change in the behavior of the mean and maximum flows was evident, however, such phenomenon was not observed in the evaluation of the minimum flows.Associação Brasileira de Recursos Hídricos2020-01-01info:eu-repo/semantics/reportinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312020000100402RBRH v.25 2020reponame:RBRH (Online)instname:Associação Brasileira de Recursos Hídricos (ABRH)instacron:ABRH10.1590/2318-0331.252020180171info:eu-repo/semantics/openAccessTozzi,Bruna Kiechaloski MiróFill,Heinz Dieter Oskar Augusteng2020-04-23T00:00:00Zoai:scielo:S2318-03312020000100402Revistahttps://www.scielo.br/j/rbrh/https://old.scielo.br/oai/scielo-oai.php||rbrh@abrh.org.br2318-03311414-381Xopendoar:2020-04-23T00:00RBRH (Online) - Associação Brasileira de Recursos Hídricos (ABRH)false
dc.title.none.fl_str_mv Verification of the stationarity of flow series in the Iguaçu River basin
title Verification of the stationarity of flow series in the Iguaçu River basin
spellingShingle Verification of the stationarity of flow series in the Iguaçu River basin
Tozzi,Bruna Kiechaloski Miró
Parametric
Statistic
Tests
title_short Verification of the stationarity of flow series in the Iguaçu River basin
title_full Verification of the stationarity of flow series in the Iguaçu River basin
title_fullStr Verification of the stationarity of flow series in the Iguaçu River basin
title_full_unstemmed Verification of the stationarity of flow series in the Iguaçu River basin
title_sort Verification of the stationarity of flow series in the Iguaçu River basin
author Tozzi,Bruna Kiechaloski Miró
author_facet Tozzi,Bruna Kiechaloski Miró
Fill,Heinz Dieter Oskar August
author_role author
author2 Fill,Heinz Dieter Oskar August
author2_role author
dc.contributor.author.fl_str_mv Tozzi,Bruna Kiechaloski Miró
Fill,Heinz Dieter Oskar August
dc.subject.por.fl_str_mv Parametric
Statistic
Tests
topic Parametric
Statistic
Tests
description ABSTRACT The purpose of this technical note is to verify the stationarity of flows in the Iguaçu River Basin, considering 14 fluviometric stations. For this purpose, three sets of annual flow series were studied: mean flows, maximum flows and minimum flows of 7 days. Initially, the exploratory analysis of the data was performed, based on the establishment of two points of change of the characteristics of the flows and the accomplishment of statistical tests of equality of mean and variance, parametric and nonparametric. Finally, composite tests were used considering the basin divided into Upper and Lower Iguaçu. In the exploratory analysis of the data, it was concluded that there was apparently a change in the trend of flow rates, part in the 1970s, part in the 1980s. Therefore, the series were divided in two different ways, at the half and at the point suggested in the exploratory analysis. Regarding the statistical tests, the Mann-Whitney test was chosen because it did not depend on the underlying distribution of the flow series, and because the test was highly recommended by other authors. It was concluded that the flow change occurred in a relatively short interval of time, and could be treated as a non-stationarity per hop. In general, the most recent change was downstream of the Uniao da Vitória fluviometric station. A change in the behavior of the mean and maximum flows was evident, however, such phenomenon was not observed in the evaluation of the minimum flows.
publishDate 2020
dc.date.none.fl_str_mv 2020-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/report
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format report
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312020000100402
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312020000100402
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/2318-0331.252020180171
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Associação Brasileira de Recursos Hídricos
publisher.none.fl_str_mv Associação Brasileira de Recursos Hídricos
dc.source.none.fl_str_mv RBRH v.25 2020
reponame:RBRH (Online)
instname:Associação Brasileira de Recursos Hídricos (ABRH)
instacron:ABRH
instname_str Associação Brasileira de Recursos Hídricos (ABRH)
instacron_str ABRH
institution ABRH
reponame_str RBRH (Online)
collection RBRH (Online)
repository.name.fl_str_mv RBRH (Online) - Associação Brasileira de Recursos Hídricos (ABRH)
repository.mail.fl_str_mv ||rbrh@abrh.org.br
_version_ 1754734702238892032