日本地球惑星科学連合2022年大会

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[J] ポスター発表

セッション記号 M (領域外・複数領域) » M-ZZ その他

[M-ZZ48] 再生可能エネルギーと地球科学

2022年5月31日(火) 11:00 〜 13:00 オンラインポスターZoom会場 (34) (Ch.34)

コンビーナ:大竹 秀明(国立研究開発法人 産業技術総合研究所 再生可能エネルギー研究センター)、コンビーナ:野原 大輔(電力中央研究所)、コンビーナ:島田 照久(弘前大学大学院理工学研究科)、コンビーナ:宇野 史睦(日本大学文理学部)、座長:大竹 秀明(国立研究開発法人 産業技術総合研究所 再生可能エネルギー研究センター)

11:00 〜 13:00

[MZZ48-P04] Cold surface water chemistry in the western area of Iwodake, North Hakkoda volcanoes

*井岡 聖一郎1、稲場 唯2若狭 幸1 (1.弘前大学地域戦略研究所、2.弘前大学)

キーワード:地表水、地熱地域、北八甲田火山群

Understanding the chemical evolution of thermal surface water (25 °C or higher) during passage from the geothermal reservoir to the surface in a geothermal area is important for assessing subsurface conditions from surface water composition and for evaluating the potential for geothermal utilization. Many studies have assessed the chemistry of thermal surface water in geothermal areas. However, little research has been done on the chemical properties of cold surface water (less than 25 °C) in geothermal areas, even when the cold surface water has a hydrogen sulfide odor. Thus, the importance of understanding the chemical evolution of cold surface water in geothermal areas for assessing subsurface conditions from surface water composition and evaluating the potential for geothermal utilization remains unclear. Therefore, we aimed to understand the chemical evolution of cold surface water with a hydrogen sulfide odor in a geothermal area, the western area of Iwodake, North Hakkoda volcanoes.
We performed on-site measurements of pH, electrical conductivity, oxidation–reduction potential, temperature, dissolved oxygen, and Fe2+ and S2– concentrations of the cold surface water with a hydrogen sulfide odor. Sampled water was analyzed in a laboratory for Li+, Na+, NH4+, K+, Mg2+, Ca2+, CH3COO, HCOO, F, Cl, Br, NO3, SO42–, Fe, Mn, B, Si, dissolved organic carbon (DOC), δ18O, and δ2H. The results suggested that the cold surface water may be affected by HCl volcanic gas as it has high Cl and SO42– concentrations. Ongoing work is focused on analysis using PHREEQC and calculation of the effective energy of microorganisms.