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LNAPLs do not always float: an example case of a viscous LNAPL under variable water table conditions

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dc.contributor.authorOostrom, M., author
dc.contributor.authorHofstee, C., author
dc.contributor.authorWietsma, T. W., author
dc.contributor.authorColorado State University, publisher
dc.date.accessioned2020-01-30T15:47:37Z
dc.date.available2020-01-30T15:47:37Z
dc.date.issued2006
dc.description2006 annual AGU hydrology days was held at Colorado State University on March 20 - March 22, 2006.
dc.descriptionIncludes bibliographical references.
dc.description.abstractAn intermediate-scale experiment was conducted to investigate the behavior of a viscous LNAPL under variable water table conditions. Two LNAPL volumes were released from a small source zone on top of the flow cell into a partly saturated, homogenously packed porous medium. Following a 30-day redistribution period, the water table was increased 0.5 m in 50 minutes. After the water table rise, LNAPL behavior was monitored for an additional 45 days. Fluid saturation scans were obtained periodically with a fully automated dual-energy gamma radiation system. Results show that both spills follow similar paths downwards. LNAPL drainage from the unsaturated zone was relatively slow and a considerable residual LNAPL saturation was observed after 30 days of drainage. Most of the mobile LNAPL moved into the capillary fringe during this period. After the water table rise, LNAPL moved up in a delayed fashion. After 45 days, the LNAPL has moved up only ap-proximately 0.2 m. Since the LNAPL has only moved up a limited amount, nonwetting fluid entrapment was also limited. The experiment was simulated using the STOMP multifluid flow simulator. A comparison indicates that the simulator is able to predict the observed phenomena well, including residual saturation formation in the vadose zone, and limited upward LNAPL movement after the water table rise. The results of this experiment show that viscous mobile LNAPL, subject to variable water table conditions, does not necessarily float on the water table and may not appear in an observation well.
dc.format.mediumborn digital
dc.format.mediumproceedings (reports)
dc.identifier.urihttps://hdl.handle.net/10217/200630
dc.identifier.urihttp://dx.doi.org/10.25675/10217/200630
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartofHydrology Days
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.titleLNAPLs do not always float: an example case of a viscous LNAPL under variable water table conditions
dc.title.alternativeHydrology days 2006
dc.title.alternativeAGU hydrology days 2006
dc.typeText

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