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Revisiting the modified Hvorslev formula to account for the dynamic process of streambed clogging: Field validation.

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Title: Revisiting the modified Hvorslev formula to account for the dynamic process of streambed clogging: Field validation.
Authors: Vasilevskiy, Peter Yu.1, Wang, Ping1 wangping@igsnrr.ac.cn, Pozdniakov, Sergey P.1, Davis, Paul1
Source: Journal of Hydrology. Jan2019, Vol. 568, p862-866. 5p.
Subjects: Hydraulic conductivity, Soil infiltration, Riparian ecology, River sediments, Arid regions
Abstract: Highlights • Clogging complicates the interpretations of falling head tests. • The modified Hvorslev formula allows us to account for the clogging process. • Field investigations demonstrate the applicability of the modified Hvorslev formula. Abstract Estimating streambed hydraulic conductivity is particularly important in arid and semi-arid regions, where surface water infiltration from ephemeral dryland streams helps maintain riparian ecosystems. In situ permeameter tests are widely used to estimate the hydraulic conductivity of streambed sediments. Previous studies have demonstrated that one of the major factors controlling spatiotemporal variations in streambed hydraulic conductivity in such areas is streambed clogging by suspended sediments. Recently, a modified Hvorslev (1951) formula was theoretically proposed to account for the effect of streambed clogging on streambed hydraulic properties due to suspended particle sedimentation during falling-head tests. To validate the modified formula, fieldwork was conducted at five sites in the lower Heihe River, a typical intermittent river of north-western China, in September 2017. A simple PVC pipe with an inner diameter of 4 cm was used as a permeameter for the field tests. Both muddy river water and clean water were used to fill the permeameter to conduct comparative tests. To differentiate the interpretation of the field testing data obtained with clean water, the data obtained with muddy river water were analysed with an equation considering an iteratively increasing total hydraulic resistance of riverbed sediments due to the effects of riverbed clogging. The estimated vertical hydraulic conductivity for the top 0.3 m of riverbed sediments varied from 1 to 41 m/day. The proposed model was shown to accurately estimate the hydraulic conductivity of riverbed sediments using both clean and muddy water during slug tests. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Hydrology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Header DbId: egs
DbLabel: Engineering Source
An: 133643320
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: <searchLink fieldCode="DE" term="%22Hydraulic+conductivity%22">Hydraulic conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+infiltration%22">Soil infiltration</searchLink><br /><searchLink fieldCode="DE" term="%22Riparian+ecology%22">Riparian ecology</searchLink><br /><searchLink fieldCode="DE" term="%22River+sediments%22">River sediments</searchLink><br /><searchLink fieldCode="DE" term="%22Arid+regions%22">Arid regions</searchLink>
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  Data: Highlights • Clogging complicates the interpretations of falling head tests. • The modified Hvorslev formula allows us to account for the clogging process. • Field investigations demonstrate the applicability of the modified Hvorslev formula. Abstract Estimating streambed hydraulic conductivity is particularly important in arid and semi-arid regions, where surface water infiltration from ephemeral dryland streams helps maintain riparian ecosystems. In situ permeameter tests are widely used to estimate the hydraulic conductivity of streambed sediments. Previous studies have demonstrated that one of the major factors controlling spatiotemporal variations in streambed hydraulic conductivity in such areas is streambed clogging by suspended sediments. Recently, a modified Hvorslev (1951) formula was theoretically proposed to account for the effect of streambed clogging on streambed hydraulic properties due to suspended particle sedimentation during falling-head tests. To validate the modified formula, fieldwork was conducted at five sites in the lower Heihe River, a typical intermittent river of north-western China, in September 2017. A simple PVC pipe with an inner diameter of 4 cm was used as a permeameter for the field tests. Both muddy river water and clean water were used to fill the permeameter to conduct comparative tests. To differentiate the interpretation of the field testing data obtained with clean water, the data obtained with muddy river water were analysed with an equation considering an iteratively increasing total hydraulic resistance of riverbed sediments due to the effects of riverbed clogging. The estimated vertical hydraulic conductivity for the top 0.3 m of riverbed sediments varied from 1 to 41 m/day. The proposed model was shown to accurately estimate the hydraulic conductivity of riverbed sediments using both clean and muddy water during slug tests. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Journal of Hydrology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.jhydrol.2018.11.034
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      – Code: eng
        Text: English
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        PageCount: 5
        StartPage: 862
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      – SubjectFull: Hydraulic conductivity
        Type: general
      – SubjectFull: Soil infiltration
        Type: general
      – SubjectFull: Riparian ecology
        Type: general
      – SubjectFull: River sediments
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      – SubjectFull: Arid regions
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      – TitleFull: Revisiting the modified Hvorslev formula to account for the dynamic process of streambed clogging: Field validation.
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            NameFull: Wang, Ping
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            NameFull: Pozdniakov, Sergey P.
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              Text: Jan2019
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              Y: 2019
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