Coupling Flow, Heat, and Reactive Transport Modeling to Reproduce In Situ Redox Potential Evolution: Application to an Infiltration Pond
| Autor: | Albert Folch, Carme Barba, Diederik Jacques, Xavier Sanchez-Vila, Paula Rodríguez-Escales |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. GHS - Grup d'Hidrologia Subterrània |
| Rok vydání: | 2020 |
| Předmět: |
In situ
Work (thermodynamics) Topsoil Flow (psychology) Soil science General Chemistry 010501 environmental sciences Seasonality medicine.disease 01 natural sciences Redox Enginyeria civil::Geologia::Hidrologia subterrània [Àrees temàtiques de la UPC] Aigües subterrànies -- Recàrrega artificial Artificial groundwater recharge Infiltration (hydrology) medicine Environmental Chemistry Sedimentary organic matter Environmental science 0105 earth and related environmental sciences |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| ISSN: | 1520-5851 0013-936X 2018-1019 |
| DOI: | 10.1021/acs.est.0c03056 |
| Popis: | This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in Environmental science & technology, copyright © American Chemical Society after peer review. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.est.0c03056 Redox potential (Eh) measurements are widely used as indicators of the dominant reduction–oxidation reactions occurring underground. Yet, Eh data are mostly used in qualitative terms, as actual values cannot be used to distinguish uniquely the dominant redox processes at a sampling point and should therefore be combined with a detailed geochemical characterization of water samples. In this work, we have intensively characterized the redox potential of the first meter of soil in an infiltration pond recharged with river water using a set of in situ sensors measuring every 12 min during a 1 year period. This large amount of data combined with hydrogeochemical campaigns allowed developing a reactive transport model capable of reproducing the redox potential in space and time together with the site hydrochemistry. Our results showed that redox processes were mainly driven by the amount of sedimentary organic matter in the system as well as by seasonal variation of temperature. As a subsidiary result, our work emphasizes the need to use a fully coupled model of flow, heat transport, solute transport, and the geochemical reaction network to fully reproduce the Eh observations in the topsoil. This work was financially supported by MONOPOLIOS (RTI2018-101990-B-100, MINECO/FEDER), the EU project MARADENTRO (PCI2019-103425-WW2017), the Catalan Research Project RESTORA (ACA210/18/00040), and AGAUR (AQU - 2017 SGR 1485). The authors wish to acknowledge Comunitat d’Usuaris d’Aigües de la Cubeta de Sant Andreu de la Barca (CUACSA) and the Agència Catalana de l’Aigua for their cooperation. |
| Databáze: | OpenAIRE |
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