z-logo
Premium
Effects of solute concentration–dependent surface tension on unsaturated flow: Laboratory sand column experiments
Author(s) -
Smith James E.,
Gillham Robert W.
Publication year - 1999
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/1998wr900106
Subject(s) - vadose zone , surface tension , tensiometer (surface tension) , water flow , water table , pore water pressure , reflectometry , pressure head , flow (mathematics) , chemistry , soil science , geotechnical engineering , geology , materials science , groundwater , environmental science , mechanics , thermodynamics , time domain , physics , computer science , computer vision
Laboratory and numerical modeling studies were conducted to investigate the effects of solute concentration–dependent surface tension on unsaturated flow and transport of a dissolved organic compound. The laboratory experiments were conducted in a 2 m long unsaturated/saturated sand column with a water table at the bottom and butanol as the solute. Pressure head was measured with tensiometers connected to pressure transducers, and water content was measured using time domain reflectometry probes. The results show that changes in surface tension caused by changes in concentration of a dissolved organic compound can have significant effects on unsaturated flow. A highly localized large flow perturbation was shown to be associated with the solute front. Relatively good agreement was found between the numerical model and experimental results. The results suggest that in many cases where dissolved organic solutes are present in the vadose zone their effects on surface tension should be included in conceptual and numerical models.

This content is not available in your region!

Continue researching here.

Having issues? You can contact us here