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Scaling the hydraulic functions of a water repellent sandy soil

100%
Stoffregen H., Wessolek G.
International Agrophysics
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2014
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tom 28
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nr 3
The heterogeneity of both unsaturated hydraulic conductivity and water retention was measured with a high spatial resolution on a transect using an evaporation method. Fifteen undisturbed 100 cm 3 soil cores were taken on a transect every 10 cm from the topsoil of a water repellent sandy site. Five dynamic water retention curves and four unsaturated conductivity curves were determined for each core. We conducted measurements without further saturation in the laboratory in order to achieve field-like conditions. The initial water contents were hetero- geneous, indicating different hysteretic conditions and water repellent areas. The scattering of the water retention curves was high, while the heterogeneity of unsaturated conductivity curves was unexpectedly low. Two scaling approaches were used to describe the heterogeneity: one with and one without considering hysteresis. The concept of scaling applies well to describing the heterogeneity of both hydraulic functions. Including hysteresis leads to similar results than excluding hysteresis. The distribution of the hydraulic conductivity and the water retention were inde- pendent from each other. The results give important information for numerical simulation of the water flow with heterogeneous hydraulic functions.
2
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The influence of drying on the sorption properties of polyethylene wax treated wood

100%
Lesar B., Sever Skapin A., Humar M.
Drewno. Prace Naukowe. Doniesienia. Komunikaty
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2011
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tom 54
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nr 185
The importance of the use of waxes in the wood industry has been increasing, particularly in Europe, since consumers, due to their increased environmental awareness, avoid using biocidally treated wood and wood from tropical forests. In this research two water-repellent emulsions in various concentrations were used: polyethylene and oxidised polyethylene wax emulsion. The performance of wax treated Norway spruce (Picea abies) and beech (Fagus sylvatica) wood was tested in two sorption experiments: conditioning in high relative air humidity (vapour diffusion) and non-continuous dipping (liquid flow). The sorption properties of oven and vacuum dried impregnated specimens were determined. During conditioning, wax treated Norway spruce specimens, vacuum and oven dried, had the same moisture content as control specimens; while treated vacuum dried beech had up to 25% lower moisture content than the parallel control specimens. An even higher difference was evident in volume changes of vacuum and oven dried beech specimens during the sorption test.
3

Development of furrow sowing for improved cropping of water repellent sands in Western Australia

84%
Blackwell P. S.
Bibliotheca Fragmenta Agronomica
|
1997
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tom 2A
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