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Effects of Air Drain and Confined Conditions to Infiltration Rate in Unsaturated Soils  

Kim, Sangrae (서울대학교 빗물연구센터)
Ki, Jaehong (서울대학교 빗물연구센터)
Kim, Youngjin (서울대학교 SIR BK사업단)
Han, Mooyoung (서울대학교 빗물연구센터)
Publication Information
Journal of Korean Society of Water and Wastewater / v.22, no.6, 2008 , pp. 681-687 More about this Journal
Abstract
It is well known that the water infiltration rate depends on soil properties such as soil water content, water head, capillary suction, density, hydraulic conductivity, and porosity. However, most of proposed infiltration models assume that the air phase is continuous and in equilibrium with the atmosphere or air compression and air entrapment on infiltration was not considered. This study presents experimental results on unsaturated water infiltration to relate air entrapment and hydraulic conductivity function based on soil air properties. The objectives of this study were to measure change of soil air pressure ahead of wetting front under air drain and air confined condition to find the confined air effect on infiltration rate, to reduce the entrapped air volume related with soil air pressure to increase the soil permeability, and to make a basis of infiltration process model for the purpose of improvement of infiltration rate in the homogeneous soil column. The results of the work show that soil air pressure increases according to increasement of the saturated soil depth rather than the wetting front depth during infiltration process.
Keywords
Infiltration rate; air confine; air drain; air entrapment; unsaturated soil; rainwater runoff reduction;
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Times Cited By KSCI : 1  (Citation Analysis)
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