Contaminant migration in unsaturated porous media using X-ray computerized tomography (CT)

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doi: 10.2166/wst.2013.801
Authors:Zhou Nianqing; Zhao Shan; Song, Wei; Otani, Jun
Author Affiliations:Primary:
Tongji University, Department of Hydraulic Engineering, Shanghai, China
Other:
Ministry of Education, Laboratory of Yangtze River Water Environment, China
Kumamoto University, Japan
Volume Title:Water Science and Technology
Source:Water Science and Technology, 69(5), p.953-959. Publisher: IWA Publishing, London, United Kingdom. ISSN: 0273-1223
Publication Date:2014
Note:In English. 16 refs.; illus., incl. 2 tables
Summary:Landfills are usually located in unsaturated zones, Contaminant leaking can easily infiltrate groundwater through these porous media and contribute to groundwater pollution. The main objective of this work is to study the leachate migration in unsaturated porous media using X-ray computerized tomography (CT) and image-processing software. Silica sand and Yamazuna sand (collected from Japan) with different particle sizes are considered. Potassium iodide (Kl) solution is used as a contaminant and injected into sand specimens at appropriate rates. The specimens are scanned at each cross section before and after contaminant injection by X-ray CT. Subsequently, all CT images are transformed into mean CT values by Image J software. VGStudio software is then used to reconstruct the subtracted images into three-dimensional images. The results indicate that vertical migration is dominant in uniform sand and horizontal migration is the main behavior in well-graded sand. Meanwhile, it is also confirmed that CT scanning is an effective technology to study contaminant migration in unsaturated porous media with different grain sizes.
Subjects:Aquifer vulnerability; Aquifers; Computed tomography; Contaminant plumes; Controls; Experimental studies; Ground water; Infiltration; Injection; Laboratory studies; Landfills; Leachate; Migration of elements; Monitoring; Pollution; Porosity; Porous materials; Preferential flow; Real-time methods; Saturation; Soil pollution; Three-dimensional models; Tomography; Unsaturated zone; Waste disposal; X-ray data
Record ID:2014081148
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute.
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