Water and Air Redistribution within a Dual Permeability Porous System Investigated Using Neutron Imaging

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F15%3A00230815" target="_blank" >RIV/68407700:21110/15:00230815 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21720/15:00230815

Result on the web

<a href="http://www.sciencedirect.com/science/article/pii/S1875389215006859" target="_blank" >http://www.sciencedirect.com/science/article/pii/S1875389215006859</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.phpro.2015.07.075" target="_blank" >10.1016/j.phpro.2015.07.075</a>

Result language

angličtina

Original language name

Water and Air Redistribution within a Dual Permeability Porous System Investigated Using Neutron Imaging

Original language description

A ponded infiltration experiment was conducted under simultaneous imaging to investigate variations in quasi-saturated hydraulic conductivity a process frequently observed in infiltration experiments in soils with wide grain - size distribution. An artificially prepared heterogeneous sample composed of coarse quartz sand (representing pathways of preferential flow) and fine porous ceramic (representing soil matrix) was investigated. The sample was 34.5 mm high and 29.0 mm in diameter. Sequences of neutron radiography images (RI) of pixel size 0.045 x 0.045 mm were taken at one angle during particular transient phases of the flow process. During quasi-steady state flow stages of the experiment radiography images were acquired in range of angles 0-180° in 0.9° step and. 3D neutron tomograms (TI) were then developed. Using the data a quantitative evaluation of the spatial and temporal distribution of water content within the sample was conducted. For every RI and TI the amount of water in particular pixels and voxels, respectively, was calculated by subtracting the image of dry sample. The accuracy of the water content estimates derived from the images was checked by comparing them to the corresponding gravimetrically determined water content data. Heavy water with equilibrium air saturation was introduced into the sample during two recurrent infiltrations. Thirty five hours later, during second infiltration, the inflow was switched to degassed heavy water in order to remove residual air present in the sample. During the first twelve hours of first infiltration run flow rate through the sample decreased from 3.7 cm/hour to 1.0 cm/hour at the end of the “steady state flow” stage. The flow rate in second run decreased from 3.6 cm/hour to 1.6 cm/hour. Comparison of the tomogram of the sample at the beginning and one taken at the end of the steady state flow stage in each run shows an increase of water content in the porous ceramic.

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

20101 - Civil engineering

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2015

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Physics Procedia

ISBN

—

ISSN

1875-3892

e-ISSN

1875-3892

Number of pages

7

Pages from-to

530-536

Publisher name

Elsevier

Place of publication

Amsterdam

Event location

Grindelwald

Event date

Oct 5, 2014

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000380606800075