Vodoodpudivosť pôdy. Čásť 1: Definície a charakteristiky vodoodpudivosti pôdy

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Title:Vodoodpudivosť pôdy. Čásť 1: Definície a charakteristiky vodoodpudivosti pôdy
Creators:
Lichner, Ľubomír; lichner at uh dot savba dot sk; Ústav hydrológie SAV, Račianska 75, 831 02 Bratislava, Slovenská republika
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 51, 4, pp. 309-320
Uncontrolled Keywords:Water Repellency, Soil, Measurement

Abstract

Water repellency is a relative (and a little misleading) term because no surface actually exerts a repelling force on a liquid. There is always some attraction between a liquid and any solid. The affinity (hydrophilicity) or repellency (hydrophobicity) between water and solid surfaces originates from mutual attractive forces (adhesion) and the attraction between the water molecules (cohesion). Soil water repellency is generally attributed to hydrophobic organic matter coating soil particles or accumulating in the soil environment. The definition of hydrophobicity and hydrophilicity, based on the contact angle α between water and a solid, reads: if α < 90°, the solid is wettable, if α ≥ 90°, the solid is water repellent (Adamson, 1990). Another definition of hydrophobicity and hydrophilicity, based on the surface-free energy, reads: solid surfaces with a surface-free energy δsa > 72.75 mN m–1 attract water and are therefore hydrophilic. Solid surfaces with a surface-free energy δsa < 72.75 mN m–1 are hydrophobic (Doerr et al., 2000). Soil water repellency (WR) is characterised using three parameters: severity (degree) of WR, persistence of WR, and index of WR. The most frequently used techniques for the severity and persistence of WR measurements are MED (molarity of ethanol droplet) and WDPT (water drop penetration time) test, respectively.

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

Title:Vodoodpudivosť pôdy. Čásť 1: Definície a charakteristiky vodoodpudivosti pôdy
Translated title:Soil water repellency. Part 1: Definitions and characteristics of soil water repellency
Creators:
Lichner, Ľubomír; lichner at uh dot savba dot sk; Ústav hydrológie SAV, Račianska 75, 831 02 Bratislava, Slovenská republika
Uncontrolled Keywords:Water Repellency, Soil, Measurement
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:51
Number:4
Page Range:pp. 309-320
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:6107
Item Type:Article
Deposited On:24 Jun 2010 13:40
Last Modified:24 Jun 2010 11:40

Citation

Lichner, Ľubomír (2003) Vodoodpudivosť pôdy. Čásť 1: Definície a charakteristiky vodoodpudivosti pôdy. Journal of Hydrology and Hydromechanics, 51 (4). pp. 309-320. ISSN 0042-790X

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