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Statements

Subject Item
n2:RIV%2F68407700%3A21720%2F14%3A00220814%21RIV15-MSM-21720___
rdf:type
skos:Concept n16:Vysledek
dcterms:description
The process of infiltration in near-saturated soil and fate of residual air bubbles was studied using neutron imaging. It is the continuation of previous study on flow instability. Ponding infiltration-outflow experiment conducted at NEUTRA beamline of the Spallation Neutron Source Division, Paul Scherrer Institut aimed at i) characterizing the types of structures susceptible to air trapping, ii) monitoring of entrapped air and water redistribution during steady state flow iii) imaging the process of entrapped air dissolution. Experiments were conducted on series of undisturbed samples of soil from the Cambisol series and on an artificially prepared sample. The latter was composed of coarse sand (representing pathways of fast preferential flow), which surrounded blocks of fine ceramic. Cumulative infiltration and outflow fluxes of water were measured gravimetrically by two precision digital scales thus the full water balance data were obtained. Small samples (30 mm in diameter) were used to achieve good spatial resolution of neutron images. Degassed water was used to dissolve bubbles of entrapped air at the end of infiltration experiments. The neutron radiography and tomography data show quantitatively exchange of water and air between domains of fine and coarse materials during quasi-steady state flow in the sample. The redistribution of the entrapped air directly affected the hydraulic conductivity. On neutron tomography images the gradual dissolving of trapped air bubbles was clearly detected. The effect also led to significant increase of hydraulic conductivity. The obtained data show clearly that air as a non-wetting phase should not be overlooked in case of near-saturated infiltration in soil with preferential flow. The research was supported by the Czech Science Foundation Project No. 14-03691S. The process of infiltration in near-saturated soil and fate of residual air bubbles was studied using neutron imaging. It is the continuation of previous study on flow instability. Ponding infiltration-outflow experiment conducted at NEUTRA beamline of the Spallation Neutron Source Division, Paul Scherrer Institut aimed at i) characterizing the types of structures susceptible to air trapping, ii) monitoring of entrapped air and water redistribution during steady state flow iii) imaging the process of entrapped air dissolution. Experiments were conducted on series of undisturbed samples of soil from the Cambisol series and on an artificially prepared sample. The latter was composed of coarse sand (representing pathways of fast preferential flow), which surrounded blocks of fine ceramic. Cumulative infiltration and outflow fluxes of water were measured gravimetrically by two precision digital scales thus the full water balance data were obtained. Small samples (30 mm in diameter) were used to achieve good spatial resolution of neutron images. Degassed water was used to dissolve bubbles of entrapped air at the end of infiltration experiments. The neutron radiography and tomography data show quantitatively exchange of water and air between domains of fine and coarse materials during quasi-steady state flow in the sample. The redistribution of the entrapped air directly affected the hydraulic conductivity. On neutron tomography images the gradual dissolving of trapped air bubbles was clearly detected. The effect also led to significant increase of hydraulic conductivity. The obtained data show clearly that air as a non-wetting phase should not be overlooked in case of near-saturated infiltration in soil with preferential flow. The research was supported by the Czech Science Foundation Project No. 14-03691S.
dcterms:title
Infiltration in heterogeneous soil monitored by neutron imaging Infiltration in heterogeneous soil monitored by neutron imaging
skos:prefLabel
Infiltration in heterogeneous soil monitored by neutron imaging Infiltration in heterogeneous soil monitored by neutron imaging
skos:notation
RIV/68407700:21720/14:00220814!RIV15-MSM-21720___
n3:aktivita
n12:S n12:P
n3:aktivity
P(GA14-03691S), S
n3:dodaniDat
n11:2015
n3:domaciTvurceVysledku
n14:8865523 n14:6594050
n3:druhVysledku
n9:O
n3:duvernostUdaju
n4:S
n3:entitaPredkladatele
n10:predkladatel
n3:idSjednocenehoVysledku
21286
n3:idVysledku
RIV/68407700:21720/14:00220814
n3:jazykVysledku
n15:eng
n3:klicovaSlova
water flow; neutron imaging; neutron radiography
n3:klicoveSlovo
n6:neutron%20imaging n6:water%20flow n6:neutron%20radiography
n3:kontrolniKodProRIV
[DB3987140657]
n3:obor
n5:DF
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
6
n3:projekt
n13:GA14-03691S
n3:rokUplatneniVysledku
n11:2014
n3:tvurceVysledku
Císlerová, Milena Sobotková, Martina Vontobel, P. Šácha, Jan Sněhota, Michal Jelínková, Vladimíra
n17:organizacniJednotka
21720