Coupling Flow, Heat, and Reactive Transport Modeling to Reproduce In Situ Redox Potential Evolution: Application to an Infiltration Pond.,Environmental Science & Technology

当前位置： X-MOL 学术 › Environ. Sci. Technol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Coupling Flow, Heat, and Reactive Transport Modeling to Reproduce In Situ Redox Potential Evolution: Application to an Infiltration Pond.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-09-08 , DOI: 10.1021/acs.est.0c03056
Paula Rodríguez-Escales _{1,

2} , Carme Barba _{1,

2} , Xavier Sanchez-Vila _{1,

2} , Diederik Jacques ₃ , Albert Folch _{1,

2}

Affiliation

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.

中文翻译：

耦合流，热和反应性传输模型以重现原位氧化还原电位的演变：在渗透池中的应用。

氧化还原电势（Eh）测量被广泛用作地下发生的主要还原-氧化反应的指标。然而，Eh数据大多以定性方式使用，因为实际值不能用于唯一地区分采样点的主要氧化还原过程，因此应与水样品的详细地球化学特征结合起来。在这项工作中，我们使用一组原位集约化地表征了充满河水的一个渗水池塘中第一米土壤的氧化还原电位。传感器在1年内每12分钟测量一次。大量的数据与水文地球化学活动相结合，使得能够开发出一种反应性传输模型，该模型能够在时空上与现场水化学一起再现氧化还原电位。我们的结果表明，氧化还原过程主要由系统中沉积有机物的数量以及温度的季节性变化驱动。作为辅助结果，我们的工作强调需要使用流量，热传输，溶质传输和地球化学反应网络的完全耦合模型来完全重现表土中的Eh观测值。

更新日期：2020-10-06

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11