Relationship between continuous air content and air conductivity in a sandy soil based on acoustic measurements
2016
Fukada, K. (Shimane University, Matue, Shimane (Japan). Faculty of Life and Environmental Science) | Kihara, Y.
Soil air conductivity has a hysteretic relationship with the air content of the soil, likely caused by amount of entrapped air depending on the wetting or drying history of the soil. Entrapped air content can be evaluated as the difference between total air content according to the volumetric water content and continuous air content based on the acoustic measurements. Acoustic tests were conducted for a 50-cubic cm cylindrical container filled with Tottori Dune sand at several stages in the drainage or imbibition process. We evaluated a relationship between continuous air content and air conductivity, as well as the effects of entrapped air on the hysteresis. Air was entrapped in the course of imbibition of water for the total air content from 15 % to 10 %. Within this total air content range, air conductivity was found to be uniquely determined with the continuous air content. Since almost no air was entrapped for the total air content exceeding 15 %, continuity of air in the soil depending on wetting or drying was assumed to be a main reason for the air conductivity - total air content hysteresis.
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