Geochemical hydraulic analysis of groundwater system in the Sabae basin, Fukui Prefecture for heat utilization

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  • Yamada Yuki
    Graduate School Divisions of Science and Engineering, University of Toyama
  • Ueda Akira
    Graduate School Divisions of Science and Engineering, University of Toyama

Bibliographic Information

Other Title
  • 熱利用のための福井県鯖江盆地地下水系の地球化学的水理解析
  • ネツ リヨウ ノ タメ ノ フクイケン サバエ ボンチ チカ スイケイ ノ チキュウ カガクテキ スイリ カイセキ

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Abstract

<p>Water quality and flow of shallow groundwaters in the Sabae City, Fukui Prefecture was examined geochemically to apply them to build up a ground source heat pump system (GSHP).Groundwaters and river waters from 25 and 5 sample localities, respectively, were collected five times from June 2014 to July 2015 and analyzed for their chemical and isotopic (D and 18O) compositions. The results show that groundwaters are mainly of meteoric origin and that the δD and δ18O are -51.8 to -31.2‰ and -9.6 to -7.4‰, respectively, plotting between two meteoric precipitation lines (δD=8δ18O+17 in summer and δD=8δ18O+30 in winter).The chemical compositions of groundwaters in the eastern area are Ca2+–HCO3- type and those in the western area are Na+–HCO3- and Ca2+–HCO3- types. Several groundwaters in the study area have high Fe concentration up to 11 mg/L and are oversaturated with respect to Fe (OH) 3. This means that cleaning of the heat exchange should be considered when open-type GSHP is used for room air conditioning.</p>

Journal

  • Chikyukagaku

    Chikyukagaku 52 (2), 73-94, 2018-06-25

    The Geochemical Society of Japan

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