1992 nendo chinetsu kaihatsu sokushin chosa hokokusho (No.35). Mizuwaketoge nanbu chiiki kankyo eikyo chosa. (Fiscal 1992 geothermal development promotion survey report (No.35). Influence on the environment in the south of Mizuwake Pass)
(Englisch)
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Investigation was made to assess the influence of conducting the geothermal survey on the surrounding environment. To the south of the Mizuwake Pass, the surveyed area was an area of about 70 km(sup 2) to the west of Oita City. The area covered Yufuin Town, Kokonoe Town and Shonai Town together. In the above area together with its surrounding area, totally six spas, including Kokonoe Lakeside Hotel, Okue Spa, Yunohira Spa and Kaminokuchi Spa, were surveyed in chemical composition and fluctuation in discharge. As for the classification in quality of the six surveyed fountainheads, three ones are single hot-strings (Na-HCO3, Na/Ca-HCO3 and Na-Cl/HCO3 respectively in type) with an evaporation residue below 1000 mg/l in total, while the three other ones are, with an evaporation residue above 1000 mg/l in total, classified into both Na-Cl/HCO3 and Na/Ca-HCO3 types of hot spring. All those fountainheads hardly fluctuate in hot-spring water temperature and are comparatively stable. However, the state of main positive ions fluctuate in all of them. Therefore, hot water is judged to be mixing from several different reservoirs. The surveyed area is not designated as an area to be protected against the exhaustion of hot spring. It is presumed that the hot-spring water is ground water which originates from the meteoric source. 6 figs., 10 tabs.
1992 nendo chinetsu kaihatsu sokushin chosa hokokusho (No.35). Mizuwaketoge nanbu chiiki kankyo eikyo chosa. (Fiscal 1992 geothermal development promotion survey report (No.35). Influence on the environment in the south of Mizuwake Pass)