| Summary: | 碩士 === 國立成功大學 === 資源工程學系碩博士班 === 94 === In this study, a shallow underground temperature prospecting method was used to investigate temperature anomaly in the areas surrounding hot spring resources. Underground temperatures were measured at 0.2, 0.4, 0.6, 0.8 and 1 m depths using SATO SK-L200T temperature data log. Distributions of isotherms were used to examine the location and areal extent of temperature anomaly for further exploration and production of hot spring resources.
Hot spring resources are abundant and widespread at different geologic formations in Taiwan. Three hot spring sites, namely Chinshan, Juisui, and Chunlun, being representative of those observed at igneous rock, metamorphic rock and sedimentary rock formations, respectively, were considered in the study. The background site located at the Department of Resources engineering, National Cheng Kung university was also selected to gather reference temperatures for comparison of those collected from other three sites. The results obtained from the study showed that at the background site, the influence of air temperature variations on underground temperatures decreased with increasing depth, and temperature readings taken at a depth 0.6 m were not effected significantly by the diurnal variations of the surface temperature.
Furthermore, the results derived from field investigations revealed that the temperature anomalies of 2.2 ℃ and 1.7 ℃ were observed from the Chinshan igneous rock region in winter and the Juisui metamorphic rock region in summer, respectively. However, there was no temperature anomaly shown at the Chunlun sedimentary rock region. As the results presented here , it is noted that examinations of the anomaly from temperature measurements at boreholes of less than 1 m depth may help identify the hot spring resources present at the shallow (50 m) igneous rock region and the mid-deep (100 m) metamorphic rock region.
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