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Article: Air and water flows in a vertical sand column

TitleAir and water flows in a vertical sand column
Authors
KeywordsAir-water two-phase flow
Vadose zone
Drainage process
Hydraulic properties
Hydrostatic equilibrium
Issue Date2011
PublisherAmerican Geophysical Union.
Citation
Water Resources Research, 2011, v. 47 n. 4 How to Cite?
AbstractThe unsteady state drainage of water from a vertical sand column with and without a finer layer on the top was studied theoretically and experimentally to investigate the airflow generated by the finer layer. The sand column, saturated at its lower portion and initially in the condition of hydrostatic equilibrium, is drained at its bottom at constant head. The results show that significant vacuum can be generated in the vadose zone of the column with a finer layer on the top. The vacuum increases quickly in the earlier stage of the drainage, reaches a maximum, and gradually becomes zero. Because of the effect of the vacuum in the vadose zone, water is held in and the cumulative outflow from the column with the finer layer is much smaller than without the layer during most of the drainage process. Ordinary differential equations (ODE), which require only saturated hydraulic properties of the porous media, are derived to predict the location of the surface of saturation and vacuum in the vadose zone in air-water two-phase flow. The solutions of ODE match very satisfactorily with the experimental data and give better results than TOUGH2. Copyright 2011 by the American Geophysical Union.
Persistent Identifierhttp://hdl.handle.net/10722/139153
ISSN
2015 Impact Factor: 3.792
2015 SCImago Journal Rankings: 2.661
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of the Hong Kong Special Administrative Region, ChinaHKU 701908P
Funding Information:

The authors thank Zhenlei Yang for providing the atmospheric pressure observation data. We also thank the anonymous reviewers for their very helpful comments. The study was partially supported by the Research Grants Council of the Hong Kong Special Administrative Region, China (HKU 701908P). TOUGH2 was run via the interface of PetraSim.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorKuang, Xen_HK
dc.contributor.authorJiao, JJen_HK
dc.contributor.authorWan, Len_HK
dc.contributor.authorWang, Xen_HK
dc.contributor.authorMao, Den_HK
dc.date.accessioned2011-09-23T05:46:05Z-
dc.date.available2011-09-23T05:46:05Z-
dc.date.issued2011en_HK
dc.identifier.citationWater Resources Research, 2011, v. 47 n. 4en_HK
dc.identifier.issn0043-1397en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139153-
dc.description.abstractThe unsteady state drainage of water from a vertical sand column with and without a finer layer on the top was studied theoretically and experimentally to investigate the airflow generated by the finer layer. The sand column, saturated at its lower portion and initially in the condition of hydrostatic equilibrium, is drained at its bottom at constant head. The results show that significant vacuum can be generated in the vadose zone of the column with a finer layer on the top. The vacuum increases quickly in the earlier stage of the drainage, reaches a maximum, and gradually becomes zero. Because of the effect of the vacuum in the vadose zone, water is held in and the cumulative outflow from the column with the finer layer is much smaller than without the layer during most of the drainage process. Ordinary differential equations (ODE), which require only saturated hydraulic properties of the porous media, are derived to predict the location of the surface of saturation and vacuum in the vadose zone in air-water two-phase flow. The solutions of ODE match very satisfactorily with the experimental data and give better results than TOUGH2. Copyright 2011 by the American Geophysical Union.en_HK
dc.languageengen_US
dc.publisherAmerican Geophysical Union.-
dc.relation.ispartofWater Resources Researchen_HK
dc.rightsWater Resources Research. Copyright © American Geophysical Union.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectAir-water two-phase flow-
dc.subjectVadose zone-
dc.subjectDrainage process-
dc.subjectHydraulic properties-
dc.subjectHydrostatic equilibrium-
dc.titleAir and water flows in a vertical sand columnen_HK
dc.typeArticleen_HK
dc.identifier.emailJiao, JJ:jjiao@hku.hken_HK
dc.identifier.authorityJiao, JJ=rp00712en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1029/2009WR009030en_HK
dc.identifier.scopuseid_2-s2.0-79955066794en_HK
dc.identifier.hkuros192960en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79955066794&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume47en_HK
dc.identifier.issue4en_HK
dc.identifier.eissn1944-7973-
dc.identifier.isiWOS:000289651100001-
dc.publisher.placeUnited Statesen_HK
dc.relation.projectSubsurface airflow induced by pumping tests-
dc.identifier.scopusauthoridKuang, X=36514932200en_HK

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