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dc.creatorBirkel Dostal, Christian
dc.creatorCorrea Barahona, Alicia
dc.creatorDuvert, Clément
dc.creatorGranados Bolaños, Sebastián
dc.creatorChavarría Palma, Andrés
dc.creatorDurán Quesada, Ana María
dc.creatorSánchez Murillo, Ricardo
dc.creatorBiester, Harald
dc.date.accessioned2021-11-23T18:36:18Z
dc.date.available2021-11-23T18:36:18Z
dc.date.issued2021
dc.identifier.citationhttps://onlinelibrary.wiley.com/doi/10.1002/hyp.14153
dc.identifier.issn1099-1085
dc.identifier.urihttps://hdl.handle.net/10669/85315
dc.description.abstractThe impacts of forest conversion on runoff generation in the tropics have received much interest, but scientific progress is still hampered by challenging fieldwork conditions and limited knowledge about runoff mechanisms. Here, we assessed the runoff generation, flow paths and water source dynamics of a pristine rainforest catchment in Costa Rica using end member mixing analysis (EMMA) and a Bayesian mixing model (MixSIAR). Geochemical tracer data collected over a 4-week field campaign were combined with tritium data used to assess potential deeper groundwater flow pathways to the perennial stream. The streamflow composition was best captured using three end-members, namely throughfall, shallow (5–15 cm) and deeper (15–50 cm) soil water. We estimated the end-member contributions to the main stream and two tributaries using the two mixing approaches and found good agreement between results obtained from EMMA and MixSIAR. The system was overwhelmingly dominated by near-surface sources, with little evidence for deeper and older groundwater as tritium-derived baseflow mean transit time was between 2.0 and 4.4 years. The shallow soil flow pathway dominated streamflow contributions in the main stream (median 39% and 49% based on EMMA and MixSIAR, respectively), followed by the deeper soil (32% and 31%) and throughfall (25% and 19%). The two tributaries had even greater shallow soil water contributions relative to the main stream (83% and 74% for tributary A and 42% and 63% for tributary B). Tributary B had no detectable deep soil water contribution, reflecting the morphology of the hillslope (steeper slopes, shallower soils and lower vegetation density compared to hillslope A). Despite the short sampling campaign and associated uncertainties, this study allowed to thoroughly assess runoff generation mechanisms in a humid tropical catchment. Our results also provide a first comparison of two increasingly used mixing models and suggest that EMMA and MixSIAR yield comparable estimates of water source partitioning in this tropical, volcanic rainforest environment.es_ES
dc.description.sponsorshipUniversidad de Costa Rica/[217-B8-276]/UCR/Costa Ricaes_ES
dc.description.sponsorshipUniversidad de Costa Rica/[217-B8-709]/UCR/Costa Ricaes_ES
dc.description.sponsorshipUniversidad de Costa Rica/[ED-3319]/UCR/Costa Ricaes_ES
dc.description.sponsorshipInternational Atomic Energy Agency/[CRP22009]/IAEA/Estados Unidoses_ES
dc.language.isoenges_ES
dc.sourceHydrological Processes, vol.35(4), pp.1-15es_ES
dc.subjectCosta Ricaes_ES
dc.subjectEMMAes_ES
dc.subjectHumid tropicses_ES
dc.subjectMixSIARes_ES
dc.subjectRunoff generationes_ES
dc.subjectTracerses_ES
dc.subjectWater source contributiones_ES
dc.titleMember and Bayesian mixing models consistently indicate near‐surface flowpath dominance in a pristine humid tropical rainforestes_ES
dc.typeartículo científico
dc.identifier.doi10.1002/hyp.14153
dc.description.procedenceUCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias Básicas::Centro de Investigaciones Geofísicas (CIGEFI)es_ES
dc.description.procedenceUCR::Vicerrectoría de Docencia::Ciencias Sociales::Facultad de Ciencias Sociales::Escuela de Geografíaes_ES
dc.identifier.codproyecto217-B8-276
dc.identifier.codproyecto217-B8-709
dc.identifier.codproyectoED-3319


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