Artikkelit kirjoittajalta Tomasz Brandyk
Determination of soil-water contact angles in peat-moorsh soils by capillary rise experiments.
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The liquid-soil contact angle indicates the wettability of a solid. This study was con ducted to determine the apparent water-solid contact angle in peat-moorsh soils located in the Biebrza River Valley using two indirect methods.One of them was the height of the capillary rise at the equilibrium, and the other was a dynamic capillary rise ap proach.The measured values of the contact angle ranged from 64.2 to 83.1 degrees using the equilibrium height of capillary rise approach, whereas for the dynamic capil lary rise method varied from 86.3 to 89.8 degrees.Comparison of the experimental results showed that the values of contact angles obtained using the dynamic capillary rise approach were about 12% higher than the values obtained from the capillary rise equation.The determined value of the apparent contact angle was affected by the gravi metric moisture content and bulk density.The contact angle values measured in peat- moorsh soils confirm that these soils exhibit some degree of hydrophobicity (water repellency)at all water contents and packed densities.
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Waniek,
Department of Environmental Development and Land Improvement, Warsaw Agricultural University, ul. Nowoursynowska 166, 02-787 Warsaw, Poland
Sähköposti:
ei.tietoa@nn.oo
- Szatylowicz, Sähköposti: ei.tietoa@nn.oo
- Brandyk, Sähköposti: ei.tietoa@nn.oo
An analysis of the influence of shrinkage on water retention characteristics of fen peat-moorsh soil.
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The paper presents the results of laboratory-and field-measured soil moisture retention characteristics for different layers in peat-moorsh soil developed from a fen.Field de termination was based on the measurements of the moisture content and pressure head values performed on undisturbed soil columns during a drying process.Laboratory measurements were performed with sand table and pressure chambers.In order to ob tain moisture retention characteristics related to actual volumetric moisture content, the shrinkage characteristics were measured for different soil layers.The comparison of the laboratory and field measured moisture retention characteristics showed that the results of field measurements were very close to those of laboratory measurements, expressed in terms of fictitious volumetric moisture content.This expression of water content based on initial soil volume provides a better estimation of differential water capacity.
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Oleszczuk,
Department of Environmental Development and Land Improvement, Warsaw Agricultural University, ul. Nowoursynowska 166, 02-787 Warsaw, Poland
Sähköposti:
ei.tietoa@nn.oo
- Szatylowicz, Sähköposti: ei.tietoa@nn.oo
- Brandyk, Sähköposti: ei.tietoa@nn.oo
- Gnatowski, Sähköposti: ei.tietoa@nn.oo
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