Examination of Dispersion Coefficient in Two-Dimensional Saturated and Unsaturated Porous Media
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Accession number;03A0495286
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| Title;Examination of Dispersion Coefficient in Two-Dimensional Saturated and Unsaturated Porous Media |
| Author;
INOUE K
(Kyoto Univ., Kyoto, Jpn)
KOBAYASHI A
(Kyoto Univ., Kyoto, Jpn)
INOUE K
(Kyoto Univ., Kyoto, Jpn)
AOYAMA S
(Kyoto Univ., Kyoto, Jpn)
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Journal Title;Transactions of the Japanese Society of Irrigation, Drainage and Reclamation Engineering
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Journal Code:S0345A
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ISSN:0387-2335
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VOL.;NO.225;PAGE.361-369(2003)
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| Figure&Table&Reference;FIG.14, TBL.1, REF.11 |
| Pub. Country;Japan |
| Language;English |
| Abstract;The objectives of this study were to obtain the dispersion coefficient and dispersivity based on a statistical model using image analysis and to investigate dye tracer movements in two-dimensional saturated and unsaturated porous media through laboratory experiments. Flow fields with the different water levels were composed of two types of glass beads in two-dimensional tank to examine dispersion phenomena. Dye tracers were injected into the capillary and saturated zones of the flow system under the steady state flow conditions and the images of tracer movements, which were recorded periodically with a digital camera, were used in the process of the estimate of the dispersion coefficient. The outlines of distributions of the tracers computed by numerical analysis were consistent with the measured results. It was found that while the flow velocity became small with the decrease of the mean grain size, the dispersion coefficient and dispersivity became large. It was also observed that dispersivity in the capillary zone is larger than that in the saturated zone. (author abst.) |
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