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- Publisher Website: 10.1111/gwat.12589
- Scopus: eid_2-s2.0-85029453155
- PMID: 28910853
- WOS: WOS:000431992600007
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Article: Impacts of streambed heterogeneity and anisotropy on residence time of hyporheic zone
Title | Impacts of streambed heterogeneity and anisotropy on residence time of hyporheic zone |
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Authors | |
Issue Date | 2018 |
Publisher | Wiley-Blackwell Publishing, Inc. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=0017-467X |
Citation | Groundwater, 2018, v. 56 n. 3, p. 425-436 How to Cite? |
Abstract | The hyporheic zone (HZ), which is the region beneath or alongside a streambed, plays an important role in the stream's ecology. The duration that a water molecule or a solute remains within the HZ, or residence time (RT), is one of the most common metrics used to evaluate the function of the HZ. The RT is greatly influenced by the streambed's hydraulic conductivity (K), which is intrinsically difficult to characterize due to its heterogeneity and anisotropy. Many laboratory and numerical studies of the HZ have simplified the streambed K to a constant, thus producing RT values that may differ from those gathered from the field. Some studies have considered the heterogeneity of the HZ, but very few have accounted for anisotropy or the natural K distributions typically found in real streambeds. This study developed numerical models in MODFLOW to examine the influence of heterogeneity and anisotropy, and that of the natural K distribution in a streambed, on the RT of the HZ. Heterogeneity and anisotropy were both found to shorten the mean and median RTs while increasing the range of the RTs. Moreover, heterogeneous K fields arranged in a more orderly pattern had longer RTs than those with random K distributions. These results could facilitate the design of streambed K values and distributions to achieve the desired RT during river restoration. They could also assist the translation of results from the more commonly considered homogeneous and/or isotropic conditions into heterogeneous and anisotropic field situations. |
Persistent Identifier | http://hdl.handle.net/10722/244822 |
ISSN | 2021 Impact Factor: 2.887 2020 SCImago Journal Rankings: 0.840 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Liu, S | - |
dc.contributor.author | Chui, TFM | - |
dc.date.accessioned | 2017-09-18T01:59:41Z | - |
dc.date.available | 2017-09-18T01:59:41Z | - |
dc.date.issued | 2018 | - |
dc.identifier.citation | Groundwater, 2018, v. 56 n. 3, p. 425-436 | - |
dc.identifier.issn | 0017-467X | - |
dc.identifier.uri | http://hdl.handle.net/10722/244822 | - |
dc.description.abstract | The hyporheic zone (HZ), which is the region beneath or alongside a streambed, plays an important role in the stream's ecology. The duration that a water molecule or a solute remains within the HZ, or residence time (RT), is one of the most common metrics used to evaluate the function of the HZ. The RT is greatly influenced by the streambed's hydraulic conductivity (K), which is intrinsically difficult to characterize due to its heterogeneity and anisotropy. Many laboratory and numerical studies of the HZ have simplified the streambed K to a constant, thus producing RT values that may differ from those gathered from the field. Some studies have considered the heterogeneity of the HZ, but very few have accounted for anisotropy or the natural K distributions typically found in real streambeds. This study developed numerical models in MODFLOW to examine the influence of heterogeneity and anisotropy, and that of the natural K distribution in a streambed, on the RT of the HZ. Heterogeneity and anisotropy were both found to shorten the mean and median RTs while increasing the range of the RTs. Moreover, heterogeneous K fields arranged in a more orderly pattern had longer RTs than those with random K distributions. These results could facilitate the design of streambed K values and distributions to achieve the desired RT during river restoration. They could also assist the translation of results from the more commonly considered homogeneous and/or isotropic conditions into heterogeneous and anisotropic field situations. | - |
dc.language | eng | - |
dc.publisher | Wiley-Blackwell Publishing, Inc. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=0017-467X | - |
dc.relation.ispartof | Groundwater | - |
dc.rights | Preprint This is the pre-peer reviewed version of the following article: [FULL CITE], which has been published in final form at [Link to final article]. Authors are not required to remove preprints posted prior to acceptance of the submitted version. Postprint This is the accepted version of the following article: [full citation], which has been published in final form at [Link to final article]. | - |
dc.title | Impacts of streambed heterogeneity and anisotropy on residence time of hyporheic zone | - |
dc.type | Article | - |
dc.identifier.email | Chui, TFM: maychui@hku.hk | - |
dc.identifier.authority | Chui, TFM=rp01696 | - |
dc.identifier.doi | 10.1111/gwat.12589 | - |
dc.identifier.pmid | 28910853 | - |
dc.identifier.scopus | eid_2-s2.0-85029453155 | - |
dc.identifier.hkuros | 276381 | - |
dc.identifier.volume | 56 | - |
dc.identifier.issue | 3 | - |
dc.identifier.spage | 425 | - |
dc.identifier.epage | 436 | - |
dc.identifier.isi | WOS:000431992600007 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 0017-467X | - |