An evaluation of the intrinsic sorptivity water repellency index on a range of New Zealand soils
1991
Wallis, M.G. | Scotter, D.R. | Horne, D.J. (Massey Univ., Palmerston North (New Zealand). Dept. of Soil Science)
The sorptivity to ethanol and water was measured for undisturbed cores from the surface of 14 soils to determine their repellency index (RI). The RI measured all soils water repellent (RI greater than 1.95) at field moisture conditions, and was more sensitive than the water drop penetration time or molality of ethanol droplet tests. The RI was used to demonstrate that water repellency reduced short-time water infiltration of soils by approximately an order of magnitude. In all soils the curves of cumulative infiltration versus the square root of time for both water and ethanol stayed linear for long enough for sorptivity evaluation. However, at longer times the slope of the curve tended to increase for water sorption in the more repellent soils, but decreased consistently for ethanol.
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