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Article: Air and water flows induced by pumping tests in unconfined aquifers with low-permeability zones

TitleAir and water flows induced by pumping tests in unconfined aquifers with low-permeability zones
Authors
Issue Date2014
PublisherJohn Wiley & Sons. The Journal's web site is located at http://www3.interscience.wiley.com/cgi-bin/jhome/4125
Citation
Hydrological Processes, 2014, v. 28 n. 21, p. 5450-5464 How to Cite?
AbstractAir flows from the atmosphere into an unconfined aquifer when the water table falls during pumping tests. Pumping test results in unconfined aquifers may be significantly affected by low-permeability zones (LPZs) near the initial water table position, because they restrict the downward movement of air. A transient, three-dimensional air–water two-phase flow model is employed to investigate numerically the effects of local heterogeneity on pumping test results in unconfined aquifers. Two cases of local heterogeneities are considered herein: a LPZ around the pumping well and on one side of the pumping well. Results show that the drawdown with the LPZ is significantly greater than that of the homogeneous aquifer. The differences in drawdown are the most significant at intermediate times and gradually diminish at later times. The LPZ significantly reduces air flow from the atmosphere to the aquifer. The pore air velocity in the LPZ is very low. The air pressure at the observation point under the LPZ when air begins to enter is significantly lower than the air pressure of the homogeneous aquifer at the same point. After that, the air pressure increases quickly and then increases slowly. The time for the air pressure to reach the atmospheric pressure is significantly longer.
Persistent Identifierhttp://hdl.handle.net/10722/200551
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorKuang, Xen_US
dc.contributor.authorJiao, JJJen_US
dc.contributor.authorZhang, Ken_US
dc.contributor.authorMao, Den_US
dc.date.accessioned2014-08-21T06:51:41Z-
dc.date.available2014-08-21T06:51:41Z-
dc.date.issued2014-
dc.identifier.citationHydrological Processes, 2014, v. 28 n. 21, p. 5450-5464en_US
dc.identifier.urihttp://hdl.handle.net/10722/200551-
dc.description.abstractAir flows from the atmosphere into an unconfined aquifer when the water table falls during pumping tests. Pumping test results in unconfined aquifers may be significantly affected by low-permeability zones (LPZs) near the initial water table position, because they restrict the downward movement of air. A transient, three-dimensional air–water two-phase flow model is employed to investigate numerically the effects of local heterogeneity on pumping test results in unconfined aquifers. Two cases of local heterogeneities are considered herein: a LPZ around the pumping well and on one side of the pumping well. Results show that the drawdown with the LPZ is significantly greater than that of the homogeneous aquifer. The differences in drawdown are the most significant at intermediate times and gradually diminish at later times. The LPZ significantly reduces air flow from the atmosphere to the aquifer. The pore air velocity in the LPZ is very low. The air pressure at the observation point under the LPZ when air begins to enter is significantly lower than the air pressure of the homogeneous aquifer at the same point. After that, the air pressure increases quickly and then increases slowly. The time for the air pressure to reach the atmospheric pressure is significantly longer.en_US
dc.languageengen_US
dc.publisherJohn Wiley & Sons. The Journal's web site is located at http://www3.interscience.wiley.com/cgi-bin/jhome/4125en_US
dc.relation.ispartofHydrological Processesen_US
dc.rightsHydrological Processes. Copyright © John Wiley & Sons.en_US
dc.titleAir and water flows induced by pumping tests in unconfined aquifers with low-permeability zonesen_US
dc.typeArticleen_US
dc.identifier.emailKuang, X: hkukxx@hku.hken_US
dc.identifier.emailJiao, JJJ: jjiao@hku.hken_US
dc.identifier.authorityJiao, JJJ=rp00712en_US
dc.identifier.doi10.1002/hyp.10058en_US
dc.identifier.hkuros232030en_US
dc.identifier.isiWOS:000342670900009-

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