Evolution of the Subsurface Thermal Environment in Urban Areas: Studies in Large Cities in East Asia

摘要: Temporal variation in the ground surface temperature (GST) propagates downward and disturbs subsurface structure. Analysis of profiles gives information on past GST history. For investigation thermal environment evolution urban areas, we reconstructed history from borehole data obtained large cities East Asia. Most estimated histories show significant warming last century. In Bangkok area, amount increase is larger city center than suburban rural corresponding to degree urbanization. The heat accumulated due warming, which can be calculated at sites where were reconstructed, a useful indicator environment. We conducted monitoring soil aiming observe process propagation variation. Data some wells exhibit periodic or long-term variations attributable human activities. Soil temperatures measured within 1 m prominent annual provide relation between air temperature.