In: Journal of Hydrology and Hydromechanics, vol. 65, no. 4
Tomas Orfanus - Abdel-Monem Amer - Grzegorz Jozefaciuk - Emil Fulajtar - Anežka Čelková
Detaily:
Rok, strany: 2017, 395 - 401
Kľúčové slová:
Soil sorptivity; Hydrophobization; Adsorption isotherm; Fractal dimension; Specific surface area.
URL originálneho zdroja: http://www.ih.sav.sk/jhh
O článku:
Soil sorptivity is considered a key parameter describing early stages of water (rain) infiltration into a relatively
dry soil and it is related to build-up complexity of the capillary system and soil wettability (contact angles of soil pore
walls). During the last decade an increasing water repellency of sandy soils under pine forest and grassland vegetation
has been frequently observed at Mlaky II location in SW Slovakia. The dry seasons result in uneven wetting of soil and
up to hundredfold decrease in soil sorptivity in these vegetated soil as compared to reference sandy material, which was
out of the reach of ambient vegetation and therefore readily wettable. As far as water binding to low moisture soils is
governed by adsorption processes, we hypothesized that soil water repellency detected by water drop penetration test and
by index of water repellency should also influence the water vapour adsorption parameters (monolayer water content,
Wm, specific surface area, A, maximum adsorption water, Wa, maximum hygroscopic water MH, fractal dimension, DS and
adsorption energies, Ea) derived from BET model of adsorption isotherms. We found however, that the connection of
these parameters to water repellency level is difficult to interpret; nevertheless the centres with higher adsorption energy
prevailed evidently in wettable materials. The water repellent forest and grassland soils reached less than 80% of the adsorption
energy measured on wettable reference material. To get more conclusive results, which would not be influenced
by small but still present variability of field materials, commercially available homogeneous siliceous sand was artificially
hydrophobized and studied in the same way, as were the field materials. This extremely water repellent material had
two-times lower surface area, very low fractal dimension (close to 2) and substantially lower adsorption energy as compared
to the same siliceous sand when not hydrophobized.
Ako citovať:
ISO 690:
Orfanus, T., Amer, A., Jozefaciuk, G., Fulajtar, E., Čelková, A. 2017. Water vapour adsorption on water repellent sandy soils. In Journal of Hydrology and Hydromechanics, vol. 65, no.4, pp. 395-401. 0042-790X (until 2019) .
APA:
Orfanus, T., Amer, A., Jozefaciuk, G., Fulajtar, E., Čelková, A. (2017). Water vapour adsorption on water repellent sandy soils. Journal of Hydrology and Hydromechanics, 65(4), 395-401. 0042-790X (until 2019) .