The underground thermal environment shows a complex structure that is affected by the topography, geological features, flow of underground water, rise in temperature from urbanization, the landcover composition and so on. For the purpose of understanding the underground thermal environment, this study measured the ground temperature of gauge wells in the center of Hadano City, Kanagawa. In general, thermal temperature remains constant all year round at a certain depth from the ground surface. But, actual measurement results showed that the closer to the ground surface, the higher the annual temperature. This study, for the purpose of analyzing the causes of underground warming, calculated the underground temperature through numerical simulation and reviewed how changes in the landcover composition structure that forms the ground surface and the temperature rise from urbanization affect underground temperature. In the numerical simulation, a complex moving model consisting of air, vegetation, heat, moisture and air was used to analyze the heat due to actual phenomena, with detailed consideration given to the effect of vegetation or the movement of moisture in the ground. The calculation results show that the gauge well of Hadano City and the underground temperature measured at 12m were almost the same, confirming the accuracy of the numerical simulation. Calculation results from areas with various landcover compositions such as green areas, barren areas and asphalt-covered areas were compared and the rising temperatures over the past 50 years in Hadano City were also taken into account to conclude that rising temperatures from urbanization, changes in the ground surface landcover composition, flow of underground water have an effect on underground temperature.
All Science Journal Classification (ASJC) codes
- Environmental Engineering