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| DOI： |
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| Characteristics of Soil Temperature Field of Canal Based on Porous Media Theory |
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TANG Shaorong, WANG Hongyu
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Ningxia University, Yinchuan 750021, China
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| Abstract: |
| Considering the frozen soil as uniform and isotropous material, the porous media theory was used to determine thermal parameters of soil under different freezing situation. A two-dimensional variable coefficient mathematical model of soil temperature was established based on the heat conduction equation, and the temperature field which varied with time and position was obtained by means of the fully implicit difference scheme and the alternating direction implicit method(ADI), then, the numerical modeling method was verified by the analytical solution of soil column. The soil temperature under an small integral U-shaped canal was simulated and accorded with in-site observation well. The results showed that porous media theory could simplify the solution of nonlinear equation, the fully implicit difference scheme and ADI were suited for small canal; Because of irregularity of the shape of canal and two-dimensional boundary, the underground water level and heat flux had different influences on temperature under different position. The temperature of shady slope was lower than bottom of canal generally, the frozen area was enlarged gradually and the temperature field was uniform, meanwhile, the freezing zone was non-uniform distribution. |
| Key words: frozen; temperature field; porous media theory; small integral U-shaped canal |
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