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Article: Sand column experiments and modeling study on coupling between groundwater level change and air flow

TitleSand column experiments and modeling study on coupling between groundwater level change and air flow
地下水位升降与空气流耦合的砂柱实验及其模拟
Authors
KeywordsGroundwater
Vadose zone
Air flow
Sand column
Hydrogeology
Issue Date2013
PublisherZhongguo Dizhi Daxue. The Journal's web site is located at http://www.cnki.com.cn/Journal/A-A5-DQKX.htm
Citation
Earth Science - Journal of China University of Geosciences, 2013, v. 38, Suppl. 1, p. 126-132 How to Cite?
地球科学(中国地质大学学报), 2013, v. 38, Suppl. 1, p. 126-132 How to Cite?
AbstractThe change of groundwater level drives air flow in the vadose zone, and the air flow in turn interacts with groundwater flow. This kind of coupling between groundwater level change and air flow becomes more apparent when the unconfined aquifer is covered by a low-permeability layer. Intake and drainage experiments were carried out in a double-layer sand column with fine sand over coarse sand, using the thin fine sand layer as the low-permeability confining layer in this study. As the water level declines in the drainage experiment, significant vacuum can be generated in the vadose and air flows from atmosphere into the column. In contrast to the drainage experiment, when the water level uplifts in the intake experiment, air pressure in the vadose zone increases and air flows outward. The change of vadose zone air pressure with time shows a single peak and is affected by the thickness of the fine sand layer. Based on the Darcy flow of groundwater in the saturated zone and the linear seepage of compressible air in the vadose zone, a simplified kinetic model is proposed to explain the air-water movement in the sand column and Runge-Kutta algorithm was used to solve the model, the observed vadose zone air pressure was reproduced. Simulation results show that the maximum air pressure in the vadose zone increases nonlinearly with the increasing of the thickness of the low-permeability layer.
Persistent Identifierhttp://hdl.handle.net/10722/200547
ISSN
2015 SCImago Journal Rankings: 0.282

 

DC FieldValueLanguage
dc.contributor.authorDong, Pen_US
dc.contributor.authorWang, XSen_US
dc.contributor.authorWan, Len_US
dc.contributor.authorKuang, Xen_US
dc.contributor.authorChen, T-Fen_US
dc.date.accessioned2014-08-21T06:51:41Z-
dc.date.available2014-08-21T06:51:41Z-
dc.date.issued2013en_US
dc.identifier.citationEarth Science - Journal of China University of Geosciences, 2013, v. 38, Suppl. 1, p. 126-132en_US
dc.identifier.citation地球科学(中国地质大学学报), 2013, v. 38, Suppl. 1, p. 126-132en_US
dc.identifier.issn1000-2383en_US
dc.identifier.urihttp://hdl.handle.net/10722/200547-
dc.description.abstractThe change of groundwater level drives air flow in the vadose zone, and the air flow in turn interacts with groundwater flow. This kind of coupling between groundwater level change and air flow becomes more apparent when the unconfined aquifer is covered by a low-permeability layer. Intake and drainage experiments were carried out in a double-layer sand column with fine sand over coarse sand, using the thin fine sand layer as the low-permeability confining layer in this study. As the water level declines in the drainage experiment, significant vacuum can be generated in the vadose and air flows from atmosphere into the column. In contrast to the drainage experiment, when the water level uplifts in the intake experiment, air pressure in the vadose zone increases and air flows outward. The change of vadose zone air pressure with time shows a single peak and is affected by the thickness of the fine sand layer. Based on the Darcy flow of groundwater in the saturated zone and the linear seepage of compressible air in the vadose zone, a simplified kinetic model is proposed to explain the air-water movement in the sand column and Runge-Kutta algorithm was used to solve the model, the observed vadose zone air pressure was reproduced. Simulation results show that the maximum air pressure in the vadose zone increases nonlinearly with the increasing of the thickness of the low-permeability layer.en_US
dc.languagechien_US
dc.publisherZhongguo Dizhi Daxue. The Journal's web site is located at http://www.cnki.com.cn/Journal/A-A5-DQKX.htmen_US
dc.relation.ispartofEarth Science - Journal of China University of Geosciencesen_US
dc.relation.ispartof地球科学(中国地质大学学报)en_US
dc.subjectGroundwateren_US
dc.subjectVadose zoneen_US
dc.subjectAir flowen_US
dc.subjectSand columnen_US
dc.subjectHydrogeologyen_US
dc.titleSand column experiments and modeling study on coupling between groundwater level change and air flowen_US
dc.title地下水位升降与空气流耦合的砂柱实验及其模拟en_US
dc.typeArticleen_US
dc.identifier.emailKuang, X: hkukxx@hku.hken_US
dc.identifier.doi10.3799/dqkx.2013.S1.013en_US
dc.identifier.hkuros232020en_US
dc.identifier.volume38, Suppl. 1en_US
dc.identifier.spage126en_US
dc.identifier.epage132en_US
dc.publisher.placeChinaen_US

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