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dc.contributor.authorCartwright, N
dc.contributor.authorNielsen, P
dc.contributor.authorLi, L
dc.date.accessioned2017-05-03T14:31:08Z
dc.date.available2017-05-03T14:31:08Z
dc.date.issued2004
dc.identifier.issn0309-1708
dc.identifier.doi10.1016/j.advwatres.2004.08.006
dc.identifier.urihttp://hdl.handle.net/10072/16714
dc.description.abstractObservations of horizontal and vertical variations in piezometric head in a homogeneous, laboratory aquifer are presented and discussed. The observed fluctuations are induced by a simple harmonic oscillation in the clear water reservoir acting across a sloping boundary. The data qualitatively supports existing theories in that higher harmonics are generated in the active forcing zone and that a significant increase in the inland, asymptotic watertable over height (relative to that found for the vertical boundary case) is observed. The observed overheight is shown to be accurately reproduced by existing small-amplitude perturbation theory. Detailed measurements in the vicinity of the sloping boundary reveal that the signal of generated higher harmonics is strongest near the sand surface and that vertical flows are significant in this region. The aquifer is of finite-depth and is influenced by capillary effects, the experimental data therefore exposes limitations of theories which are based on the assumption of a shallow aquifer free of capillary effects. The dispersive properties of the measured pressure wave in the aquifer are comparable to those found from field observations and likewise do not agree with those predicted by the capillary free, shallow aquifer theory. Although some improvement is obtained, discrepancies between the data and theory persist even when a finite-depth aquifer and capillary effects are considered in the theoretical model. Further sand column experiments eliminate a truncated capillary fringe as a possible contributor to these discrepancies. However, the neglect of horizontal flows in the fringe may have caused the discrepancies.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.languageEnglish
dc.language.isoeng
dc.publisherPergamon
dc.publisher.placeUnited Kingdom
dc.relation.ispartofpagefrom991
dc.relation.ispartofpageto1004
dc.relation.ispartofissue10
dc.relation.ispartofjournalAdvances in Water Resources
dc.relation.ispartofvolume27
dc.subject.fieldofresearchApplied mathematics
dc.subject.fieldofresearchCivil engineering
dc.subject.fieldofresearchEnvironmental engineering
dc.subject.fieldofresearchcode4901
dc.subject.fieldofresearchcode4005
dc.subject.fieldofresearchcode4011
dc.titleExperimental observations of watertable waves in an unconfined aquifer with a sloping boundary
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.date.issued2015-02-02T04:16:00Z
gro.hasfulltextNo Full Text
gro.griffith.authorCartwright, Nick B.


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