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dc.contributor.authorCartwright, N
dc.contributor.authorNielsen, P
dc.contributor.authorPerrochet, P
dc.date.accessioned2019-02-07T04:35:06Z
dc.date.available2019-02-07T04:35:06Z
dc.date.issued2005
dc.date.modified2009-01-20T06:11:04Z
dc.identifier.issn0043-1397
dc.identifier.doi10.1029/2005WR004023
dc.identifier.urihttp://hdl.handle.net/10072/4305
dc.description.abstractComprehensive measurements of the water table response to simple harmonic forcing at the base of a sand column are presented and discussed. In similar experiments, Nielsen and Perrochet (2000) observed that fluctuations in the total moisture were both damped and lagged relative to the water table fluctuations. As a result, the concept of a complex effective porosity was proposed as a convenient means to account for the damping and phase lag through its magnitude and argument, respectively. The complex effective porosity then enables simple analytical solutions for the water table (and total moisture) dynamics including hysteresis. In this paper, these previous experiments are extended to cover a wider range of oscillation frequencies and are conducted for three well-sorted materials with median grain diameters of 0.082, 0.2, and 0.78 mm, respectively. In agreement with existing theory, the influence of the capillary fringe is shown to increase with the oscillation frequency. However, the complex effective porosity model corresponding to the classical Green and Ampt (1911) capillary tube approximations is shown to be inadequate when compared to the data. These limitations are overcome by the provision of an empirical, frequency-dependent complex effective porosity model fit to the data. Using measured moisture retention parameters, numerical simulation of the data solving a nonhysteretic van Genuchten-Richards' equation type model is unable to replicate the observations. Existing results of a hysteretic numerical model are shown to be in good agreement with the extended database.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.languageEnglish
dc.language.isoeng
dc.publisherAmerican Geophysical Union
dc.publisher.placeWashington, D.C.
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom08416
dc.relation.ispartofpageto08416
dc.relation.ispartofissue8
dc.relation.ispartofjournalWater Resources Research
dc.relation.ispartofvolume41
dc.rights.retentionY
dc.subject.fieldofresearchPhysical Geography and Environmental Geoscience
dc.subject.fieldofresearchCivil Engineering
dc.subject.fieldofresearchEnvironmental Engineering
dc.subject.fieldofresearchcode0406
dc.subject.fieldofresearchcode0905
dc.subject.fieldofresearchcode0907
dc.titleInfluence of capillarity on a simple harmonic oscillating water table: Sand column experiments and modeling
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
dc.description.versionVersion of Record (VoR)
gro.facultyGriffith Sciences, School of Engineering and Built Environment
gro.rights.copyright© 2005 American Geophysical Union. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
gro.date.issued2005
gro.hasfulltextFull Text
gro.griffith.authorCartwright, Nick B.


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