Contaminant migration in unsaturated porous media using X-ray computerized tomography (CT).
Contaminant migration in unsaturated porous media using X-ray computerized tomography (CT).
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使用 X 射线计算机断层扫描 (CT) 测量不饱和多孔介质中的污染物迁移。
DOI：
10.2166/wst.2013.801
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
J. Otani
中科院分区：
文献类型：
--
作者：
N. Zhou;Shan Zhao;Wei Song;J. Otani
垃圾填埋场通常位于非饱和区域。污染物泄漏很容易通过这些多孔介质渗入地下水，造成地下水污染。这项工作的主要目的是利用 X 射线计算机断层扫描 (CT) 和图像处理软件研究渗滤液在不饱和多孔介质中的迁移。考虑不同粒径的硅砂和山津砂（产自日本）。使用碘化钾 (KI) 溶液作为污染物，并以适当的速率注入沙样样本中。在污染物注入之前和之后，通过 X 射线 CT 对每个横截面的样本进行扫描。随后，所有CT图像通过Image J软件转换为平均CT值。然后使用 VGStudio 软件将减影图像重建为三维图像。结果表明，均匀砂体中以垂直运移为主，级配砂体中以水平运移为主。同时也证实了CT扫描是研究不同粒径非饱和多孔介质中污染物迁移的有效技术。
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 (KI) 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.
影响因子：
3.6
作者：
Werth, Charles J.;Zhang, Changyong;Brusseau, Mark L.;Oostrom, Mart;Baumann, Thomas
通讯作者：
Baumann, Thomas