Steaming groundのモデル実験

抄録

Heat discharge through the terrain surface at the volcanic and geothermal area has been so far estimated mainly by the in situ field measurements. In volcanic area, direct measurements are not applicable to inaccessible area, such as crater floor. In recent years, however, remote measurement technique by means of infrared detectors has been developed and handy IR radiometers or thermo cameras are commercially available. Application of these equipments to the desired area yields the detailed surface temperature distributions very easily and safely. Hence, it is highly desirable to establish formulae which can evaluate the amount of heat discharge from the desired area. based on the surface temperature measurement using infrared equipments. This paper deals with a preliminary experiment on the heat discharge from the surface of the porous medium heated from below. Fine glass beads were used as a porous medium and the experiments were carried out under dry and water saturated conditions. The vertical temperature gradient of the medium, the surface temperature and the amount of heat discharge were measured by thermocouples. The surface of the medium was subjected to the free air and evaporation was allowed for the water saturated condition.