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Babko, Maryia, 2016. What is the impact of entrapped air on the measurement of saturated hydraulic conductivity of soil?. Second cycle, A2E. Uppsala: SLU, Dept. of Soil and Environment



X-ray computed tomography was applied to investigate the influence of entrapped air on standard
laboratory measurements of saturated hydraulic conductivity Ks in five soil samples. The investigation
consisted of five X-ray scans for each sample. Soil samples were saturated by the standard laboratory
method from the bottom at the first step. To attain full saturation and explore the difference of
entrapped air content on the standard laboratory measurements, a vacuum chamber was used to
remove the entrapped air from the initially unsaturated soils and then the samples were again saturated
from the bottom. To measure Ks, a measurement device that is based on a constant-head principle was
applied. The results showed that the volume of entrapped air greatly depends on how the soil was
saturated. Furthermore, the saturated hydraulic conductivity and the entrapped air content were
negatively correlated with a strong Pearson correlation coefficient (rb = -0.6). Thus, not considering
the existence of entrapped air leads to errors in estimating Ks values.

Main title:What is the impact of entrapped air on the measurement of saturated hydraulic conductivity of soil?
Authors:Babko, Maryia
Supervisor:Koestel, Johannes
Examiner:Jarvis, Nicholas
Series:Examensarbeten / Institutionen för mark och miljö, SLU
Volume/Sequential designation:2016:13
Year of Publication:2016
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:None
Supervising department:(NL, NJ) > Dept. of Soil and Environment
Keywords:air bubbles, vacuum saturation, X-ray computed tomography, the constant-head method of Ks measurement, standard laboratory method of saturation, critical pore diameter
Permanent URL:
Subject. Use of subject categories until 2023-04-30.:Water resources and management
Soil science and management
Deposited On:08 Jul 2016 11:54
Metadata Last Modified:08 Jul 2016 11:54

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