SUPHRE: A Reactive Transport Model With Unsaturated and Density-Dependent Flow

IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Zhaoyang Luo, Jun Kong, Chengji Shen, D. A. Barry
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引用次数: 0

Abstract

Although unsaturated and density-dependent flow affect solute fate in groundwater, they are rarely both included in reactive transport models. Using the operator-splitting method, a new reactive transport model (SUPHRE) was developed by combining a variable-saturation and variable-density multiple-component solute transport model (SUTRA-MS) with a geochemical reaction module (PhreeqcRM). In contrast to existing reactive transport models, SUPHRE accounts for both unsaturated and density-dependent flow. Model setup for SUPHRE is convenient, as only one setup file is required in addition to the usual input files of SUTRA-MS and PhreeqcRM. By further implementing a time-variant boundary condition into SUTRA-MS, SUPHRE can simulate multi-component reactive transport in tidally influenced coastal unconfined aquifers where unsaturated and density-dependent flow prevail. Two examples were used to validate the new reactive transport model, including single-species decay and sorption within a one-dimensional soil column and a four-species decay chain in a two-dimensional aquifer. Following validation, SUPHRE was adopted to reveal unsaturated flow effects on oxygen consumption and nitrate reduction in tidally influenced coastal unconfined aquifers. Whether for simulating oxygen consumption or nitrate reduction, there were visible deviations between numerical results without and with unsaturated flow, highlighting that unsaturated flow can affect reactive solute transport and transformation.

Abstract Image

SUPHRE:非饱和与密度相关流的反应迁移模型
虽然非饱和流和密度流会影响地下水中溶质的归宿,但它们很少同时被纳入反应迁移模型。利用算子拆分法,将可变饱和度和可变密度多组分溶质运移模型(SUTRA-MS)与地球化学反应模块(PhreeqcRM)相结合,开发了一种新的反应运移模型(SUPHRE)。与现有的反应迁移模型不同的是,SUPHRE 同时考虑了非饱和流动和密度依赖性流动。SUPHRE 的模型设置非常方便,除了 SUTRA-MS 和 PhreeqcRM 的常规输入文件外,只需一个设置文件。通过在 SUTRA-MS 中进一步采用时变边界条件,SUPHRE 可以模拟受潮汐影响的沿岸无 压含水层中的多组分反应输运,在这种含水层中,非饱和流和密度依赖流非常普遍。用两个例子验证了新的反应迁移模型,包括一维土柱中的单物种衰变和吸附,以及二维含水层中的四物种衰变链。经过验证后,SUPHRE 被用于揭示潮汐影响的沿海非封闭含水层中非饱和流对氧气消耗和硝酸盐还原的影响。无论是模拟氧气消耗还是硝酸盐还原,无非饱和流动和有非饱和流动的数值结果之间都存在明显偏差,这突出表明非饱和流动会影响活性溶质的迁移和转化。
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来源期刊
Journal of Advances in Modeling Earth Systems
Journal of Advances in Modeling Earth Systems METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
11.40
自引率
11.80%
发文量
241
审稿时长
>12 weeks
期刊介绍: The Journal of Advances in Modeling Earth Systems (JAMES) is committed to advancing the science of Earth systems modeling by offering high-quality scientific research through online availability and open access licensing. JAMES invites authors and readers from the international Earth systems modeling community. Open access. Articles are available free of charge for everyone with Internet access to view and download. Formal peer review. Supplemental material, such as code samples, images, and visualizations, is published at no additional charge. No additional charge for color figures. Modest page charges to cover production costs. Articles published in high-quality full text PDF, HTML, and XML. Internal and external reference linking, DOI registration, and forward linking via CrossRef.
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