Automated se-up designed to measure hydraulic parameters in heterogeneous soil close to saturation

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Title:Automated se-up designed to measure hydraulic parameters in heterogeneous soil close to saturation
Creators:
Sněhota, Michal; CTU, Fac. of Civil Engng., Dept. of Irrigation, Drainage and Landscape Engng, Thákurova 7, 166 29 Prague 6, Czech Republic
Císlerová, Milena; CTU, Fac. of Civil Engng., Dept. of Irrigation, Drainage and Landscape Engng, Thákurova 7, 166 29 Prague 6, Czech Republic
Robovská, Alice; CTU, Fac. of Civil Engng., Dept. of Irrigation, Drainage and Landscape Engng, Thákurova 7, 166 29 Prague 6, Czech Republic
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 50, 3, pp. 247-257
Uncontrolled Keywords:Heterogeneous Soil, Automated Set-up, Tension Infiltration, Ponded Infiltration

Abstract

Uncertainty in estimation of hydraulic conductivity function from the retention curve limits the possibility of accurate quantitative predictions of water flow in natural heterogeneous porous media. Experiments were conducted on large undisturbed soil samples to measure hydraulic conductivity function directly. As a next stage, an enhanced set-up with fully automated data acquisition was developed to allow long infiltration-outflow experiments under variable saturated conditions. To control the upper boundary condition the tension infiltration disc is used. The inflow and the outflow rate are recorded continuously. The soil water pressure heads are measured at three different heights. Continuous weighing of the sample during the experiment monitors changes in the soil water content. For undisturbed soil sample of coarse sandy loam, a sequence of experimental runs was performed, each represented by a constant suction pressure head applied to the soil surface. The initial conditions of each run were the same. All experimental runs show several noticeable stages, the bulk soil water content changes during those stages are presented here. Automation of the experimental set-up allowed the extension of the experiment duration and improved the accuracy of the data. Because of the long experiment duration, remarkable phenomenons were observed.

Official URL: http://147.213.145.2/vc/vc1.asp

Title:Automated se-up designed to measure hydraulic parameters in heterogeneous soil close to saturation
Translated title:Automatizovaná sestava pro měření hydraulických parametrů heterogenních půd v blízkosti nasycení
Creators:
Sněhota, Michal; CTU, Fac. of Civil Engng., Dept. of Irrigation, Drainage and Landscape Engng, Thákurova 7, 166 29 Prague 6, Czech Republic
Císlerová, Milena; CTU, Fac. of Civil Engng., Dept. of Irrigation, Drainage and Landscape Engng, Thákurova 7, 166 29 Prague 6, Czech Republic
Robovská, Alice; CTU, Fac. of Civil Engng., Dept. of Irrigation, Drainage and Landscape Engng, Thákurova 7, 166 29 Prague 6, Czech Republic
Uncontrolled Keywords:Heterogeneous Soil, Automated Set-up, Tension Infiltration, Ponded Infiltration
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:50
Number:3
Page Range:pp. 247-257
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:6139
Item Type:Article
Deposited On:25 Jun 2010 17:51
Last Modified:25 Jun 2010 15:51

Citation

Sněhota, Michal; Císlerová, Milena; Robovská, Alice (2002) Automated se-up designed to measure hydraulic parameters in heterogeneous soil close to saturation. Journal of Hydrology and Hydromechanics, 50 (3). pp. 247-257. ISSN 0042-790X

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