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DOI | 10.1002/2017WR020734 |
Determination of hyporheic travel time distributions and other parameters from concurrent conservative and reactive tracer tests by local-in-global optimization | |
Knapp, Julia L. A.; Cirpka, Olaf A. | |
2017-06-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:6 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany |
英文摘要 | The complexity of hyporheic flow paths requires reach-scale models of solute transport in streams that are flexible in their representation of the hyporheic passage. We use a model that couples advective-dispersive in-stream transport to hyporheic exchange with a shape-free distribution of hyporheic travel times. The model also accounts for two-site sorption and transformation of reactive solutes. The coefficients of the model are determined by fitting concurrent stream-tracer tests of conservative (fluorescein) and reactive (resazurin/resorufin) compounds. The flexibility of the shape-free models give rise to multiple local minima of the objective function in parameter estimation, thus requiring global-search algorithms, which is hindered by the large number of parameter values to be estimated. We present a local-in-global optimization approach, in which we use a Markov-Chain Monte Carlo method as global-search method to estimate a set of in-stream and hyporheic parameters. Nested therein, we infer the shape-free distribution of hyporheic travel times by a local Gauss-Newton method. The overall approach is independent of the initial guess and provides the joint posterior distribution of all parameters. We apply the described local-in-global optimization method to recorded tracer breakthrough curves of three consecutive stream sections, and infer section-wise hydraulic parameter distributions to analyze how hyporheic exchange processes differ between the stream sections. Plain Language Summary Compounds, dissolved in river water, are transported along the river, but also to some extent into the sediments and back into the river. While being in the sediments, they may react. In reactive stream-tracer tests, we add easy-to-detect reactive compounds into a stream and measure time-series of concentration in the river further downstream. We present an approach of analyzing such tracer tests in a flexible, yet reliable manner, which also provides the uncertainty of our interpretation. This can be useful in the assessment of river-water quality |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000405997000029 |
WOS关键词 | STREAM ; SIMULATION ; EXCHANGE |
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/20138 |
专题 | 资源环境科学 |
作者单位 | Univ Tubingen, Ctr Appl Geosci, Tubingen, Germany |
推荐引用方式 GB/T 7714 | Knapp, Julia L. A.,Cirpka, Olaf A.. Determination of hyporheic travel time distributions and other parameters from concurrent conservative and reactive tracer tests by local-in-global optimization[J]. WATER RESOURCES RESEARCH,2017,53(6). |
APA | Knapp, Julia L. A.,&Cirpka, Olaf A..(2017).Determination of hyporheic travel time distributions and other parameters from concurrent conservative and reactive tracer tests by local-in-global optimization.WATER RESOURCES RESEARCH,53(6). |
MLA | Knapp, Julia L. A.,et al."Determination of hyporheic travel time distributions and other parameters from concurrent conservative and reactive tracer tests by local-in-global optimization".WATER RESOURCES RESEARCH 53.6(2017). |
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