抄録
The study area ‘Hatchobaru-Otake geothermal field’ is located west of Kuju volcano in the central Kyushu island of southwest Japan. There are three power plants operating from the geothermal field such as Otake plant generating about 12.5 MW peak of power from 1967, Hatchobaru unit 1 is generating 55MW peak of power from 1977 and Hatchobaru unit 2 generating 55 MW from 1990. The prime objective is to explore and monitor the thermal status of the Hatchobaru-Otake geothermal area using night time ASTER satellite thermal infrared images from 2009 to 2017 in this study. Split-window algorithm used for land surface temperature measurment and Stefan-Boltzmann equation was used for radiative heat flux estimation in this study. Local AMEDAS meteorological data was used for atmospheric transmissivity derivation for the ASTER image acquisition time of the study area. The result showed that the radiative heat loss was about 30 MW, 40 MW and 0.4 MW respectively in 2009, 2013 and 2017. The higher anomaly area of radiative heat flux was obatined in 2013 and lower in 2009.
