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Reply to comment by X. X. Zhang et al. on “Three‐dimensional quantification of soil hydraulic properties using X‐ray computed tomography and image‐based modeling”
Author(s) -
Tracy Saoirse R.,
Daly Keith R.,
Sturrock Craig J.,
Crout Neil M. J.,
Mooney Sacha J.,
Roose Tiina
Publication year - 2016
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 - 10.1002/2016wr018699
Subject(s) - slip (aerodynamics) , zhàng , x ray , computed tomography , porosity , geology , air water , boundary value problem , geometry , mechanics , geotechnical engineering , mathematics , physics , mathematical analysis , optics , geography , thermodynamics , medicine , archaeology , radiology , china
In response to the comment raised by Zhang et al. (2016, doi: 10.1002/2015WR018432) we explore the differences in average velocity computed using slip and no‐slip boundary conditions at the air water interface. We consider a porous medium in which the air phase acts to impede the movement of water rather than to lubricate it, a case closer to the observed distribution of water in our CT images. We find that, whilst the slip boundary condition may be a more accurate approximation, in cases where the air phase is seen to impede water movement the differences between the two approaches are negligible.