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Article: Field monitoring of rainfall infiltration in a loess slope and analysis of failure mechanism of rainfall-induced landslides

TitleField monitoring of rainfall infiltration in a loess slope and analysis of failure mechanism of rainfall-induced landslides
Authors
KeywordsArtificial Rainfall
Field Monitoring
Infiltration
Loess Slope
Unsaturated Soil
Wetting Front
Issue Date2009
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/enggeo
Citation
Engineering Geology, 2009, v. 105 n. 1-2, p. 134-150 How to Cite?
AbstractA full-scale field experiment involving artificial rainfall has been conducted in an instrumented loess cut slope in an expressway in a loess plateau, Northwest China. Instrumentations including soil moisture probes, tensiometers, piezometers, vacuum sensors, water level sensors, and rain gauge were installed in the slope. After monitoring for about 2 years, artificial rainfall was induced at the site in April 2007. This paper presents the results from soil moisture probes, tensiometers, and water levels to reveal the surface infiltration process in an unsaturated soil. The results show that the top 0.7 m in loess is an active zone under the process of infiltration and evaporation, when subjected to a maximum rainfall intensity of 40 mm/day. The depth of the "wetting front" during the wet season was limited to the top 2 m of soil. During high rainfall intensity of 120 mm/day, the depth of the "wetting front" is about 3 m. Based on the variation of volumetric water content and matric suction in soil, a method to analyze the rainfall infiltration is proposed. By means of Gravity-Predominant Flow (GPF) concept, the infiltration rate is analyzed in the deeper soil. The results explain well the observations that loess slopes could be stable in the wet season, but it may tend to slide about 3-6 months later in the dry season. The surface infiltration has a very limited effect on the permanent groundwater table, which is at a greater depth. © 2008 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/150489
ISSN
2015 Impact Factor: 2.196
2015 SCImago Journal Rankings: 1.810
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants CouncilHKU 7176/05E
HKU 713807E
Funding Information:

The financial support of Research Grants Council (Project No. HKU 7176/05E and HKU 713807E) is sincerely acknowledged. The authors would like to thank Mr. T. C. Chan, Department of Civil Engineering, The University of Hong Kong, for his assistance during the installation of the instruments and the artificial rainfall tests.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorTu, XBen_US
dc.contributor.authorKwong, AKLen_US
dc.contributor.authorDai, FCen_US
dc.contributor.authorTham, LGen_US
dc.contributor.authorMin, Hen_US
dc.date.accessioned2012-06-26T06:05:08Z-
dc.date.available2012-06-26T06:05:08Z-
dc.date.issued2009en_US
dc.identifier.citationEngineering Geology, 2009, v. 105 n. 1-2, p. 134-150en_US
dc.identifier.issn0013-7952en_US
dc.identifier.urihttp://hdl.handle.net/10722/150489-
dc.description.abstractA full-scale field experiment involving artificial rainfall has been conducted in an instrumented loess cut slope in an expressway in a loess plateau, Northwest China. Instrumentations including soil moisture probes, tensiometers, piezometers, vacuum sensors, water level sensors, and rain gauge were installed in the slope. After monitoring for about 2 years, artificial rainfall was induced at the site in April 2007. This paper presents the results from soil moisture probes, tensiometers, and water levels to reveal the surface infiltration process in an unsaturated soil. The results show that the top 0.7 m in loess is an active zone under the process of infiltration and evaporation, when subjected to a maximum rainfall intensity of 40 mm/day. The depth of the "wetting front" during the wet season was limited to the top 2 m of soil. During high rainfall intensity of 120 mm/day, the depth of the "wetting front" is about 3 m. Based on the variation of volumetric water content and matric suction in soil, a method to analyze the rainfall infiltration is proposed. By means of Gravity-Predominant Flow (GPF) concept, the infiltration rate is analyzed in the deeper soil. The results explain well the observations that loess slopes could be stable in the wet season, but it may tend to slide about 3-6 months later in the dry season. The surface infiltration has a very limited effect on the permanent groundwater table, which is at a greater depth. © 2008 Elsevier B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/enggeoen_US
dc.relation.ispartofEngineering Geologyen_US
dc.subjectArtificial Rainfallen_US
dc.subjectField Monitoringen_US
dc.subjectInfiltrationen_US
dc.subjectLoess Slopeen_US
dc.subjectUnsaturated Soilen_US
dc.subjectWetting Fronten_US
dc.titleField monitoring of rainfall infiltration in a loess slope and analysis of failure mechanism of rainfall-induced landslidesen_US
dc.typeArticleen_US
dc.identifier.emailKwong, AKL:kwongakl@hkucc.hku.hken_US
dc.identifier.emailTham, LG:hrectlg@hkucc.hku.hken_US
dc.identifier.authorityKwong, AKL=rp00129en_US
dc.identifier.authorityTham, LG=rp00176en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.enggeo.2008.11.011en_US
dc.identifier.scopuseid_2-s2.0-63149104695en_US
dc.identifier.hkuros160205-
dc.identifier.hkuros212157-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-63149104695&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume105en_US
dc.identifier.issue1-2en_US
dc.identifier.spage134en_US
dc.identifier.epage150en_US
dc.identifier.isiWOS:000265998600014-
dc.publisher.placeNetherlandsen_US
dc.relation.projectLarge Direct Shear Tests of Soil Blocks with Roots-
dc.relation.projectField monitoring and modeling of hydrological processes of a hillslope prone to landsliding-
dc.identifier.scopusauthoridTu, XB=7102136710en_US
dc.identifier.scopusauthoridKwong, AKL=24385436300en_US
dc.identifier.scopusauthoridDai, FC=7102055666en_US
dc.identifier.scopusauthoridTham, LG=7006213628en_US
dc.identifier.scopusauthoridMin, H=34973198300en_US

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