Self-Organizing Maps for Evaluation of Biogeochemical Processes and Temporal Variations in Water Quality of Subtropical Reservoirs
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1029/2019WR025991 http://hdl.handle.net/11449/198266 |
Resumo: | Water quality in reservoirs is often compromised in many regions worldwide by nutrients and trace metals. This demands continuous monitoring; however, analyses of large data sets collected during regular monitoring remain a difficult task. Multivariate techniques offer a fast and robust approach for interpreting complex results. The objective of this study was to check the efficacy of self-organizing maps (SOMs) as a tool to investigate biogeochemical processes. This tool can also help to illustrate influences of land use patterns on the water quality of reservoirs. Here we use the Itupararanga Reservoir in Brazil as a subtropical example. Vertical profiles were sampled from seven sites in the reservoir in a total of seven campaigns over 24 months. Next to physicochemical parameters in the water column (dissolved oxygen, Eh, pH, and temperature), levels of nutrients (NO3 −, NH4 +, and PO4 3−), transition and trace metals (Al, Ba, Ca, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, and Zn), and chlorophyll-a (Chla) were measured. These variables were correlated with land use using SOM. With this technique samples were classified into 17 distinct groups that showed distinct influences of spatial heterogeneity and seasonality. The analyses helped to reveal a seasonal stratification period, where Fe, Mn, and P were released from sediments. Nutrients and some metal inputs (Al and Fe) were related to agricultural, urban, and grass/pasture areas around the reservoir. Our approach also helped to explain physical and biogeochemical seasonality in the reservoir. |
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Self-Organizing Maps for Evaluation of Biogeochemical Processes and Temporal Variations in Water Quality of Subtropical ReservoirsKohonen neural networklimnologyreservoir managementtrophic state index (TSI)Water quality in reservoirs is often compromised in many regions worldwide by nutrients and trace metals. This demands continuous monitoring; however, analyses of large data sets collected during regular monitoring remain a difficult task. Multivariate techniques offer a fast and robust approach for interpreting complex results. The objective of this study was to check the efficacy of self-organizing maps (SOMs) as a tool to investigate biogeochemical processes. This tool can also help to illustrate influences of land use patterns on the water quality of reservoirs. Here we use the Itupararanga Reservoir in Brazil as a subtropical example. Vertical profiles were sampled from seven sites in the reservoir in a total of seven campaigns over 24 months. Next to physicochemical parameters in the water column (dissolved oxygen, Eh, pH, and temperature), levels of nutrients (NO3 −, NH4 +, and PO4 3−), transition and trace metals (Al, Ba, Ca, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, and Zn), and chlorophyll-a (Chla) were measured. These variables were correlated with land use using SOM. With this technique samples were classified into 17 distinct groups that showed distinct influences of spatial heterogeneity and seasonality. The analyses helped to reveal a seasonal stratification period, where Fe, Mn, and P were released from sediments. Nutrients and some metal inputs (Al and Fe) were related to agricultural, urban, and grass/pasture areas around the reservoir. Our approach also helped to explain physical and biogeochemical seasonality in the reservoir.Deutscher Akademischer AustauschdienstInstitute of Science and Technology São Paulo State University (UNESP)Department Lake Research UFZ-Helmholtz Centre for Environmental ResearchDepartment of Geography and Geosciences GeoZentrum Nordbayern Friedrich-Alexander University Erlangen-Nürnberg (FAU)Institute of Biosciences-Department of Ecology University of São Paulo (USP)Institute of Science and Technology São Paulo State University (UNESP)Deutscher Akademischer Austauschdienst: 88887.122769/2016-00Deutscher Akademischer Austauschdienst: 88887.141964/2017-00Deutscher Akademischer Austauschdienst: 88887.165060/2018-00Deutscher Akademischer Austauschdienst: 99999.008107/2015-07Deutscher Akademischer Austauschdienst: DAAD-ID 57414997Universidade Estadual Paulista (Unesp)UFZ-Helmholtz Centre for Environmental ResearchFriedrich-Alexander University Erlangen-Nürnberg (FAU)Universidade de São Paulo (USP)Melo, Darllene S. [UNESP]Gontijo, Erik S. J. [UNESP]Frascareli, Daniele [UNESP]Simonetti, Vanessa C. [UNESP]Machado, Leila S. [UNESP]Barth, Johannes A. C.Moschini-Carlos, Viviane [UNESP]Pompêo, Marcelo L.Rosa, André H. [UNESP]Friese, Kurt2020-12-12T01:08:06Z2020-12-12T01:08:06Z2019-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article10268-10281http://dx.doi.org/10.1029/2019WR025991Water Resources Research, v. 55, n. 12, p. 10268-10281, 2019.1944-79730043-1397http://hdl.handle.net/11449/19826610.1029/2019WR0259912-s2.0-85076354852Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengWater Resources Researchinfo:eu-repo/semantics/openAccess2021-10-23T10:11:18Zoai:repositorio.unesp.br:11449/198266Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T10:11:18Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Self-Organizing Maps for Evaluation of Biogeochemical Processes and Temporal Variations in Water Quality of Subtropical Reservoirs |
title |
Self-Organizing Maps for Evaluation of Biogeochemical Processes and Temporal Variations in Water Quality of Subtropical Reservoirs |
spellingShingle |
Self-Organizing Maps for Evaluation of Biogeochemical Processes and Temporal Variations in Water Quality of Subtropical Reservoirs Melo, Darllene S. [UNESP] Kohonen neural network limnology reservoir management trophic state index (TSI) |
title_short |
Self-Organizing Maps for Evaluation of Biogeochemical Processes and Temporal Variations in Water Quality of Subtropical Reservoirs |
title_full |
Self-Organizing Maps for Evaluation of Biogeochemical Processes and Temporal Variations in Water Quality of Subtropical Reservoirs |
title_fullStr |
Self-Organizing Maps for Evaluation of Biogeochemical Processes and Temporal Variations in Water Quality of Subtropical Reservoirs |
title_full_unstemmed |
Self-Organizing Maps for Evaluation of Biogeochemical Processes and Temporal Variations in Water Quality of Subtropical Reservoirs |
title_sort |
Self-Organizing Maps for Evaluation of Biogeochemical Processes and Temporal Variations in Water Quality of Subtropical Reservoirs |
author |
Melo, Darllene S. [UNESP] |
author_facet |
Melo, Darllene S. [UNESP] Gontijo, Erik S. J. [UNESP] Frascareli, Daniele [UNESP] Simonetti, Vanessa C. [UNESP] Machado, Leila S. [UNESP] Barth, Johannes A. C. Moschini-Carlos, Viviane [UNESP] Pompêo, Marcelo L. Rosa, André H. [UNESP] Friese, Kurt |
author_role |
author |
author2 |
Gontijo, Erik S. J. [UNESP] Frascareli, Daniele [UNESP] Simonetti, Vanessa C. [UNESP] Machado, Leila S. [UNESP] Barth, Johannes A. C. Moschini-Carlos, Viviane [UNESP] Pompêo, Marcelo L. Rosa, André H. [UNESP] Friese, Kurt |
author2_role |
author author author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) UFZ-Helmholtz Centre for Environmental Research Friedrich-Alexander University Erlangen-Nürnberg (FAU) Universidade de São Paulo (USP) |
dc.contributor.author.fl_str_mv |
Melo, Darllene S. [UNESP] Gontijo, Erik S. J. [UNESP] Frascareli, Daniele [UNESP] Simonetti, Vanessa C. [UNESP] Machado, Leila S. [UNESP] Barth, Johannes A. C. Moschini-Carlos, Viviane [UNESP] Pompêo, Marcelo L. Rosa, André H. [UNESP] Friese, Kurt |
dc.subject.por.fl_str_mv |
Kohonen neural network limnology reservoir management trophic state index (TSI) |
topic |
Kohonen neural network limnology reservoir management trophic state index (TSI) |
description |
Water quality in reservoirs is often compromised in many regions worldwide by nutrients and trace metals. This demands continuous monitoring; however, analyses of large data sets collected during regular monitoring remain a difficult task. Multivariate techniques offer a fast and robust approach for interpreting complex results. The objective of this study was to check the efficacy of self-organizing maps (SOMs) as a tool to investigate biogeochemical processes. This tool can also help to illustrate influences of land use patterns on the water quality of reservoirs. Here we use the Itupararanga Reservoir in Brazil as a subtropical example. Vertical profiles were sampled from seven sites in the reservoir in a total of seven campaigns over 24 months. Next to physicochemical parameters in the water column (dissolved oxygen, Eh, pH, and temperature), levels of nutrients (NO3 −, NH4 +, and PO4 3−), transition and trace metals (Al, Ba, Ca, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, and Zn), and chlorophyll-a (Chla) were measured. These variables were correlated with land use using SOM. With this technique samples were classified into 17 distinct groups that showed distinct influences of spatial heterogeneity and seasonality. The analyses helped to reveal a seasonal stratification period, where Fe, Mn, and P were released from sediments. Nutrients and some metal inputs (Al and Fe) were related to agricultural, urban, and grass/pasture areas around the reservoir. Our approach also helped to explain physical and biogeochemical seasonality in the reservoir. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-12-01 2020-12-12T01:08:06Z 2020-12-12T01:08:06Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1029/2019WR025991 Water Resources Research, v. 55, n. 12, p. 10268-10281, 2019. 1944-7973 0043-1397 http://hdl.handle.net/11449/198266 10.1029/2019WR025991 2-s2.0-85076354852 |
url |
http://dx.doi.org/10.1029/2019WR025991 http://hdl.handle.net/11449/198266 |
identifier_str_mv |
Water Resources Research, v. 55, n. 12, p. 10268-10281, 2019. 1944-7973 0043-1397 10.1029/2019WR025991 2-s2.0-85076354852 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Water Resources Research |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
10268-10281 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1799964965549899776 |