Investigating flow instabilities caused by entrapped air: Infiltration-outflow experiment monitored by neutron tomography

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F12%3A00201386" target="_blank" >RIV/68407700:21110/12:00201386 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Investigating flow instabilities caused by entrapped air: Infiltration-outflow experiment monitored by neutron tomography
Original language description
Temporal variation of quasi saturated hydraulic conductivity of soil is often ascribed to changing fraction of the entrapped air and it is not considered in standard theory of water flow in porous media. Variation of quasi steady state flow was observedduring ponded infiltration experiments on three small undisturbed samples of coarse sandy loam. Two main flow irregularities typical for soil under study were detected for two soil samples during recurrent ponding experiment: (1) Gradual decrease of thequasi-saturated hydraulic conductivity (Kqs) soon after outflow appeared and (2) lower Kqs during the second infiltration run. The third sample didn't produce similar variability. Series of neutron tomography images of the sample taken during quasi-steady state stage of the first infiltration run showed air trapping in many of large pores and cavities. Furthermore, many of entrapped air bubbles increased in volume during the course of the first infiltration run. Further entrapped air red
Czech name
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Czech description
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Project
<a href="/en/project/GA103%2F08%2F1552" target="_blank" >GA103/08/1552: Water flow and solute transport in porous media with the presence of discontinuous gas phase</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2012
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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