Spatio-temporal variability of the isotopic input signal in a partly forested catchment: Implications for hydrograph separation

The isotopic composition of precipitation (D and 18O) has been widely used as an input signal in water tracer studies. Whereas much recent effort has been put into developing methodologies to improve our understanding and modelling of hydrological processes (e.g., transit-time distributions or young...

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Autores: Cayuela, Carles, Latron, Jérôme, Geris, Josie, Llorens, Pilar
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2019
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/200793
Acceso en línea:http://hdl.handle.net/10261/200793
Access Level:acceso abierto
Palabra clave:catchment input signal
isotope hydrograph separation
spatio-temporal variability
stable water isotopes
uncertainty
Vallcebre research catchments
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spelling Spatio-temporal variability of the isotopic input signal in a partly forested catchment: Implications for hydrograph separationCayuela, CarlesLatron, JérômeGeris, JosieLlorens, Pilarcatchment input signalisotope hydrograph separationspatio-temporal variabilitystable water isotopesuncertaintyVallcebre research catchmentsThe isotopic composition of precipitation (D and 18O) has been widely used as an input signal in water tracer studies. Whereas much recent effort has been put into developing methodologies to improve our understanding and modelling of hydrological processes (e.g., transit-time distributions or young water fractions), less attention has been paid to the spatio-temporal variability of the isotopic composition of precipitation, used as input signal in these studies. Here, we investigated the uncertainty in isotope-based hydrograph separation due to the spatio-temporal variability of the isotopic composition of precipitation. The study was carried out in a Mediterranean headwater catchment (0.56 km2). Rainfall and throughfall samples were collected at three locations across this relatively small catchment, and stream water samples were collected at the outlet. Results showed that throughout an event, the spatial variability of the input signal had a higher impact on hydrograph separation results than its temporal variability. However, differences in isotope-based hydrograph separation determined preevent water due to the spatio-temporal variability were different between events and ranged between 1 and 14%. Based on catchment-scale isoscapes, the most representative sampling location could also be identified. This study confirms that even in small headwater catchments, spatio-temporal variability can be significant. Therefore, it is important to characterize this variability and identify the best sampling strategy to reduce the uncertainty in our understanding of catchment hydrological processes. © 2018 John Wiley & Sons, Ltd.This research was supported by the projects TransHyMed (CGL2016‐75957‐R AEI/FEDER, UE) and MASCC‐DYNAMITE (PCIN‐2017‐061/AEI). C. Cayuela was beneficiary of a predoctoral FPI grant (BES‐2014‐070609) and a predoctoral mobility grant (EEBB‐I‐17‐12493). We are grateful to G. Bertran, F. Gallart, A.J. Molina, M. Moreno de las Heras, and E. Sánchez‐Costa for their support during fieldwork and data analysis. We also thank all the members of the Northern Rivers Institute where part of this study was conceived. Finally, we want to thank M. Eaude for reviewing the English.Peer reviewedWiley-BlackwellLatron, J. [0000-0003-3253-6734]Llorens, Pilar [0000-0003-4591-5303]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202020202019info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/200793reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1002/hyp.13309Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2007932026-05-22T06:33:51Z
dc.title.none.fl_str_mv Spatio-temporal variability of the isotopic input signal in a partly forested catchment: Implications for hydrograph separation
title Spatio-temporal variability of the isotopic input signal in a partly forested catchment: Implications for hydrograph separation
spellingShingle Spatio-temporal variability of the isotopic input signal in a partly forested catchment: Implications for hydrograph separation
Cayuela, Carles
catchment input signal
isotope hydrograph separation
spatio-temporal variability
stable water isotopes
uncertainty
Vallcebre research catchments
title_short Spatio-temporal variability of the isotopic input signal in a partly forested catchment: Implications for hydrograph separation
title_full Spatio-temporal variability of the isotopic input signal in a partly forested catchment: Implications for hydrograph separation
title_fullStr Spatio-temporal variability of the isotopic input signal in a partly forested catchment: Implications for hydrograph separation
title_full_unstemmed Spatio-temporal variability of the isotopic input signal in a partly forested catchment: Implications for hydrograph separation
title_sort Spatio-temporal variability of the isotopic input signal in a partly forested catchment: Implications for hydrograph separation
dc.creator.none.fl_str_mv Cayuela, Carles
Latron, Jérôme
Geris, Josie
Llorens, Pilar
author Cayuela, Carles
author_facet Cayuela, Carles
Latron, Jérôme
Geris, Josie
Llorens, Pilar
author_role author
author2 Latron, Jérôme
Geris, Josie
Llorens, Pilar
author2_role author
author
author
dc.contributor.none.fl_str_mv Latron, J. [0000-0003-3253-6734]
Llorens, Pilar [0000-0003-4591-5303]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv catchment input signal
isotope hydrograph separation
spatio-temporal variability
stable water isotopes
uncertainty
Vallcebre research catchments
topic catchment input signal
isotope hydrograph separation
spatio-temporal variability
stable water isotopes
uncertainty
Vallcebre research catchments
description The isotopic composition of precipitation (D and 18O) has been widely used as an input signal in water tracer studies. Whereas much recent effort has been put into developing methodologies to improve our understanding and modelling of hydrological processes (e.g., transit-time distributions or young water fractions), less attention has been paid to the spatio-temporal variability of the isotopic composition of precipitation, used as input signal in these studies. Here, we investigated the uncertainty in isotope-based hydrograph separation due to the spatio-temporal variability of the isotopic composition of precipitation. The study was carried out in a Mediterranean headwater catchment (0.56 km2). Rainfall and throughfall samples were collected at three locations across this relatively small catchment, and stream water samples were collected at the outlet. Results showed that throughout an event, the spatial variability of the input signal had a higher impact on hydrograph separation results than its temporal variability. However, differences in isotope-based hydrograph separation determined preevent water due to the spatio-temporal variability were different between events and ranged between 1 and 14%. Based on catchment-scale isoscapes, the most representative sampling location could also be identified. This study confirms that even in small headwater catchments, spatio-temporal variability can be significant. Therefore, it is important to characterize this variability and identify the best sampling strategy to reduce the uncertainty in our understanding of catchment hydrological processes. © 2018 John Wiley & Sons, Ltd.
publishDate 2019
dc.date.none.fl_str_mv 2019
2020
2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/200793
url http://hdl.handle.net/10261/200793
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1002/hyp.13309
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Wiley-Blackwell
publisher.none.fl_str_mv Wiley-Blackwell
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.81155

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