Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017WR021645 |
Accounting for the Decreasing Reaction Potential of Heterogeneous Aquifers in a Stochastic Framework of Aquifer-Scale Reactive Transport | |
Loschko, Matthias1; Woehling, Thomas2,3; Rudolph, David L.4; Cirpka, Olaf A.1 | |
2018 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2018 |
卷号 | 54期号:1页码:442-463 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; New Zealand; Canada |
英文摘要 | Many groundwater contaminants react with components of the aquifer matrix, causing a depletion of the aquifer's reactivity with time. We discuss conceptual simplifications of reactive transport that allow the implementation of a decreasing reaction potential in reactive-transport simulations in chemically and hydraulically heterogeneous aquifers without relying on a fully explicit description. We replace spatial coordinates by travel-times and use the concept of relative reactivity, which represents the reaction-partner supply from the matrix relative to a reference. Microorganisms facilitating the reactions are not explicitly modeled. Solute mixing is neglected. Streamlines, obtained by particle tracking, are discretized in travel-time increments with variable content of reaction partners in the matrix. As exemplary reactive system, we consider aerobic respiration and denitrification with simplified reaction equations: Dissolved oxygen undergoes conditional zero-order decay, nitrate follows first-order decay, which is inhibited in the presence of dissolved oxygen. Both reactions deplete the bioavailable organic carbon of the matrix, which in turn determines the relative reactivity. These simplifications reduce the computational effort, facilitating stochastic simulations of reactive transport on the aquifer scale. In a one-dimensional test case with a more detailed description of the reactions, we derive a potential relationship between the bioavailable organic-carbon content and the relative reactivity. In a three-dimensional steady-state test case, we use the simplified model to calculate the decreasing denitrification potential of an artificial aquifer over 200 years in an ensemble of 200 members. We demonstrate that the uncertainty in predicting the nitrate breakthrough in a heterogeneous aquifer decreases with increasing scale of observation. Plain Language Summary Many aquifers can break down nitrate that was introduced into the groundwater by farmers. Unfortunately, this natural ability is lost over time while the reaction takes place. When modelling this process, one faces the difficulty that many parameters are not or only little known. That's why we have to run many models with different parameters. In existing models, the decreasing ability to break down the nitrate could not be accounted for. In our model, we look at the important factors controlling this process. By that, we can account for the decreasing reaction potential. And we are still able to calculate this so fast that many model runs are possible. We believe that this is an important contribution to the existing models because it helps to make better predictions about nitrate in groundwater and to get a better understanding of what is really happening. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000428474000025 |
WOS关键词 | GENERALIZED EXPOSURE TIME ; DRINKING-WATER NITRATE ; POROUS-MEDIA ; CONVECTIVE TRANSPORT ; MULTICOMPONENT MIXTURES ; DIFFERENTIAL-EQUATIONS ; BIOREACTIVE TRANSPORT ; DENITRIFICATION RATES ; GROUNDWATER NITRATE ; AGRICULTURAL SOILS |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/21423 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Tubingen, Ctr Appl Geosci, Tubingen, Germany; 2.Tech Univ Dresden, Dept Hydrol, Dresden, Germany; 3.Lincoln Agritech Ltd, Ruakura Res Ctr, Hamilton, New Zealand; 4.Univ Waterloo, Dept Earth & Environm Sci, Waterloo, ON, Canada |
推荐引用方式 GB/T 7714 | Loschko, Matthias,Woehling, Thomas,Rudolph, David L.,et al. Accounting for the Decreasing Reaction Potential of Heterogeneous Aquifers in a Stochastic Framework of Aquifer-Scale Reactive Transport[J]. WATER RESOURCES RESEARCH,2018,54(1):442-463. |
APA | Loschko, Matthias,Woehling, Thomas,Rudolph, David L.,&Cirpka, Olaf A..(2018).Accounting for the Decreasing Reaction Potential of Heterogeneous Aquifers in a Stochastic Framework of Aquifer-Scale Reactive Transport.WATER RESOURCES RESEARCH,54(1),442-463. |
MLA | Loschko, Matthias,et al."Accounting for the Decreasing Reaction Potential of Heterogeneous Aquifers in a Stochastic Framework of Aquifer-Scale Reactive Transport".WATER RESOURCES RESEARCH 54.1(2018):442-463. |
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