Measurement of Unsaturated Hydraulic Conductivity of Unfrozen and Frozen Soils by Centrifuging Method.
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Accession number;03A0178542
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| Title;Measurement of Unsaturated Hydraulic Conductivity of Unfrozen and Frozen Soils by Centrifuging Method. |
| Author;
LIU X
(Gifu Univ., United Graduate School of Agricultural Sci., JPN)
AMAYA TAKAO
(Gifu Univ., Faculty of Agriculture, JPN)
AKAE TAKEO
(Okayama Univ., Faculty of Environmental Sci. and Techonol., JPN)
NISHIMURA NAOMASA
(Gifu Univ., Faculty of Agriculture, JPN)
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Journal Title;Transactions of the Japanese Society of Irrigation, Drainage and Reclamation Engineering
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Journal Code:S0345A
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ISSN:0387-2335
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VOL.;NO.223;PAGE.39-46(2003)
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| Figure&Table&Reference;FIG.12, TBL.1, REF.29 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;In prediction of water movement in soil accompanied with freezing and thawing in arid cold region, hydraulic conductivity of the frozen soil must be measured precisely. However, such a method which can be applied to various textures of soils and at lower temperature encountered in actual fields situation has not been established. In order to measure the unsaturated hydraulic conductivity of the frozen soil, we developed a new method based on Darcy's law by applying centrifugal force as driving force of water instead of gravity, and examined its basic performance at 20.DEG.C. and -5.DEG.C. on sandy, loamy and clayey soils. On unfrozen soils, the centrifuge method caused some compression and the obtained hydraulic conductivity under higher rotation speed was relatively smaller value than that under lower rotation speed, however, the results almost agreed with that obtained by upward suction method. On the other hand, no compression effect was found in measurement of the frozen soils. The measured unsaturated hydraulic conductivity values of the frozen soils were in the range of 10-9cm/s to 10-8cm/s. Thus, it was revealed that the centrifuge method is a promising method to measure the unsaturated hydraulic conductivity of the soils, particularly frozen soils. (author abst.) |
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