Recent changes (1973–2014 versus 1903–1972) in the flow regime of the Lower Paraná River and current fluvial pollution warnings in its Delta Biosphere Reserve

Alterations in flow regimes of large rivers may originate or increase risks to ecosystems and humans. The Paraná River basin (South America) undergoes human pressures (e.g., heavy damming in the upper basin, deforestation, and mixed pollution) that may affect the water quantity and quality of its te...

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Autores principales:	Puig, Alba, Olguin Salinas, Héctor Fernando
Publicado:	2016
Materias:	Biosphere Reserve Change-point detection Ecohydrology Environmental flows Fluvial system Hydrologic alteration indicators La Plata basin Water pollution bacterium climate variation concentration (composition) ecohydrology environmental indicator flood flow regulation fluvial process guideline hydrothermal alteration nature reserve river water seasonality stochasticity warning system water pollution Argentina La Plata Basin Paraguay Parana Basin Parana River San Pedro [Paraguay] Cyanobacteria Escherichia coli water pollutant analysis chemistry hydrology river water flow water quality Hydrology Rivers Water Movements Water Pollutants, Chemical Water Quality
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09441344_v23_n12_p11471_Puig http://hdl.handle.net/20.500.12110/paper_09441344_v23_n12_p11471_Puig
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_09441344_v23_n12_p11471_Puig
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spelling	paper:paper_09441344_v23_n12_p11471_Puig2023-06-08T15:53:39Z Recent changes (1973–2014 versus 1903–1972) in the flow regime of the Lower Paraná River and current fluvial pollution warnings in its Delta Biosphere Reserve Puig, Alba Olguin Salinas, Héctor Fernando Biosphere Reserve Change-point detection Ecohydrology Environmental flows Fluvial system Hydrologic alteration indicators La Plata basin Water pollution bacterium climate variation concentration (composition) ecohydrology environmental indicator flood flow regulation fluvial process guideline hydrothermal alteration nature reserve river water seasonality stochasticity warning system water pollution Argentina La Plata Basin Paraguay Parana Basin Parana River San Pedro [Paraguay] Cyanobacteria Escherichia coli water pollutant analysis Argentina chemistry hydrology river water flow water pollutant water quality Argentina Hydrology Rivers Water Movements Water Pollutants, Chemical Water Quality Alterations in flow regimes of large rivers may originate or increase risks to ecosystems and humans. The Paraná River basin (South America) undergoes human pressures (e.g., heavy damming in the upper basin, deforestation, and mixed pollution) that may affect the water quantity and quality of its terminal Delta (Argentina). In this study, after applying univariate and multivariate change-point detection and trend analyses to the daily data series of flows incoming to the Delta (Paraná-Santa Fe section), flow characteristics were compared by Indicators of Hydrologic Alteration (IHA) and Environmental Flow Components (EFC). Some flood characteristics were also compared from hydrometric levels in the middle Delta (San Pedro station). Chemical and microbiological water variables in the main rivers of the “Paraná Delta” Biosphere Reserve were examined during two extreme hydrologic years (October 2008 to July 2010) to detect potential risk factors in association with hydrologic conditions. In the Lower Paraná River, a historical period (1903–1972) and two more altered periods (1973–1999 wet period and 2000–2014 dry period) were identified. Flow duration curves evidenced different changes in both altered periods, reflecting the joint effect of climatic variability and human influence. The most evident alterations in the flow regime were the lack of record of the extreme-low-flow component, the attenuation of monthly flow seasonality, and the increase in the number of reversals (dry period) and in the variability of maximum and minimum flow dates. These alterations are consistent with the monthly and daily flow regulation by upstream dams evidenced by available data from the current dry period. In the middle Delta, the marked monthly seasonality in flood days decreased only in the wet period. The proportion between the number of flood days exceeding the evacuation level and that of those exceeding the warning level doubled in the wet period but decreased only slightly in the dry period. In the Delta Reserve rivers, concentrations of Escherichia coli, cadmium, lead, iron, manganese, and ammonium exceeded guideline levels under a severe drought and a dispersal of cyanobacteria appeared under a high-flow pulse in La Niña year. The ammonium concentration exceeded the level for human drink with the overbanking flood stage in El Niño year. These occasional detections pose a potential risk to the aquatic life and, especially, to the inhabitants of the Reserve. Flow duration curves, IHA, and EFC are useful tools to evaluate trends or changes of ecological and social relevance in flow regime characteristics. © 2016, Springer-Verlag Berlin Heidelberg. Fil:Puig, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Olguín Salinas, H.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09441344_v23_n12_p11471_Puig http://hdl.handle.net/20.500.12110/paper_09441344_v23_n12_p11471_Puig
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Biosphere Reserve Change-point detection Ecohydrology Environmental flows Fluvial system Hydrologic alteration indicators La Plata basin Water pollution bacterium climate variation concentration (composition) ecohydrology environmental indicator flood flow regulation fluvial process guideline hydrothermal alteration nature reserve river water seasonality stochasticity warning system water pollution Argentina La Plata Basin Paraguay Parana Basin Parana River San Pedro [Paraguay] Cyanobacteria Escherichia coli water pollutant analysis Argentina chemistry hydrology river water flow water pollutant water quality Argentina Hydrology Rivers Water Movements Water Pollutants, Chemical Water Quality
spellingShingle	Biosphere Reserve Change-point detection Ecohydrology Environmental flows Fluvial system Hydrologic alteration indicators La Plata basin Water pollution bacterium climate variation concentration (composition) ecohydrology environmental indicator flood flow regulation fluvial process guideline hydrothermal alteration nature reserve river water seasonality stochasticity warning system water pollution Argentina La Plata Basin Paraguay Parana Basin Parana River San Pedro [Paraguay] Cyanobacteria Escherichia coli water pollutant analysis Argentina chemistry hydrology river water flow water pollutant water quality Argentina Hydrology Rivers Water Movements Water Pollutants, Chemical Water Quality Puig, Alba Olguin Salinas, Héctor Fernando Recent changes (1973–2014 versus 1903–1972) in the flow regime of the Lower Paraná River and current fluvial pollution warnings in its Delta Biosphere Reserve
topic_facet	Biosphere Reserve Change-point detection Ecohydrology Environmental flows Fluvial system Hydrologic alteration indicators La Plata basin Water pollution bacterium climate variation concentration (composition) ecohydrology environmental indicator flood flow regulation fluvial process guideline hydrothermal alteration nature reserve river water seasonality stochasticity warning system water pollution Argentina La Plata Basin Paraguay Parana Basin Parana River San Pedro [Paraguay] Cyanobacteria Escherichia coli water pollutant analysis Argentina chemistry hydrology river water flow water pollutant water quality Argentina Hydrology Rivers Water Movements Water Pollutants, Chemical Water Quality
description	Alterations in flow regimes of large rivers may originate or increase risks to ecosystems and humans. The Paraná River basin (South America) undergoes human pressures (e.g., heavy damming in the upper basin, deforestation, and mixed pollution) that may affect the water quantity and quality of its terminal Delta (Argentina). In this study, after applying univariate and multivariate change-point detection and trend analyses to the daily data series of flows incoming to the Delta (Paraná-Santa Fe section), flow characteristics were compared by Indicators of Hydrologic Alteration (IHA) and Environmental Flow Components (EFC). Some flood characteristics were also compared from hydrometric levels in the middle Delta (San Pedro station). Chemical and microbiological water variables in the main rivers of the “Paraná Delta” Biosphere Reserve were examined during two extreme hydrologic years (October 2008 to July 2010) to detect potential risk factors in association with hydrologic conditions. In the Lower Paraná River, a historical period (1903–1972) and two more altered periods (1973–1999 wet period and 2000–2014 dry period) were identified. Flow duration curves evidenced different changes in both altered periods, reflecting the joint effect of climatic variability and human influence. The most evident alterations in the flow regime were the lack of record of the extreme-low-flow component, the attenuation of monthly flow seasonality, and the increase in the number of reversals (dry period) and in the variability of maximum and minimum flow dates. These alterations are consistent with the monthly and daily flow regulation by upstream dams evidenced by available data from the current dry period. In the middle Delta, the marked monthly seasonality in flood days decreased only in the wet period. The proportion between the number of flood days exceeding the evacuation level and that of those exceeding the warning level doubled in the wet period but decreased only slightly in the dry period. In the Delta Reserve rivers, concentrations of Escherichia coli, cadmium, lead, iron, manganese, and ammonium exceeded guideline levels under a severe drought and a dispersal of cyanobacteria appeared under a high-flow pulse in La Niña year. The ammonium concentration exceeded the level for human drink with the overbanking flood stage in El Niño year. These occasional detections pose a potential risk to the aquatic life and, especially, to the inhabitants of the Reserve. Flow duration curves, IHA, and EFC are useful tools to evaluate trends or changes of ecological and social relevance in flow regime characteristics. © 2016, Springer-Verlag Berlin Heidelberg.
author	Puig, Alba Olguin Salinas, Héctor Fernando
author_facet	Puig, Alba Olguin Salinas, Héctor Fernando
author_sort	Puig, Alba
title	Recent changes (1973–2014 versus 1903–1972) in the flow regime of the Lower Paraná River and current fluvial pollution warnings in its Delta Biosphere Reserve
title_short	Recent changes (1973–2014 versus 1903–1972) in the flow regime of the Lower Paraná River and current fluvial pollution warnings in its Delta Biosphere Reserve
title_full	Recent changes (1973–2014 versus 1903–1972) in the flow regime of the Lower Paraná River and current fluvial pollution warnings in its Delta Biosphere Reserve
title_fullStr	Recent changes (1973–2014 versus 1903–1972) in the flow regime of the Lower Paraná River and current fluvial pollution warnings in its Delta Biosphere Reserve
title_full_unstemmed	Recent changes (1973–2014 versus 1903–1972) in the flow regime of the Lower Paraná River and current fluvial pollution warnings in its Delta Biosphere Reserve
title_sort	recent changes (1973–2014 versus 1903–1972) in the flow regime of the lower paraná river and current fluvial pollution warnings in its delta biosphere reserve
publishDate	2016
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09441344_v23_n12_p11471_Puig http://hdl.handle.net/20.500.12110/paper_09441344_v23_n12_p11471_Puig
work_keys_str_mv	AT puigalba recentchanges19732014versus19031972intheflowregimeofthelowerparanariverandcurrentfluvialpollutionwarningsinitsdeltabiospherereserve AT olguinsalinashectorfernando recentchanges19732014versus19031972intheflowregimeofthelowerparanariverandcurrentfluvialpollutionwarningsinitsdeltabiospherereserve
_version_	1768543236730650624

Recent changes (1973–2014 versus 1903–1972) in the flow regime of the Lower Paraná River and current fluvial pollution warnings in its Delta Biosphere Reserve

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