Numerical Simulation of Soil Temperature Control in a Ridge

The control of soil temperature in the root zone by circulating warm or cold water in pipelines buried in ridges has been carried out for a long time. However there is little research on temperature distribution in the ridge during the temperature control process. In our previous paper (Tanaka and Ishii, 2000), numerical solutions of soil temperature distribution in a ridge were shown for the cases of soil cooling and soil heating, and the effects of soil physical properties, ambient air temperature, direct solar radiation absorbed at ridge surfaces, and the surface temperature of pipes on soil temperature distribution were examined. In this paper, the effects of ridge geometry and depth of buried pipes on soil temperature were examined using the same method and conditions as those shown in the previous paper. Further simulations for the case of changing the surface temperature of pipes with time to prevent high soil temperature in the daytime were carried out for the case of soil heating.