Geochemical Study on the Annual Variation of Oxygen Isotope and Chemical Composition of Groundwater in the Sho River Alluvium Fan, Toyama, Japan, as an Investigation of Selected Qualitative Aspects of Efficient Utilization of Groundwater Heat

Seasonal variations of water temperature, electric conductivity, and oxygen isotope chemical composition shallow groundwaters river waters were determined in the Sho River alluvial fan, western Toyama Prefecture, Japan, to examine groundwater heat utilization for indoor climate control. Samples collected at 31 sites every 2 months 1 year 11 representative monthly. In addition, results monthly precipitation amount within region during same period also taken into account. The sources are a mixture precipitation. contribution is generally small along but reaches as much 80% Oyabe south west fan. Though origin differs regionally, temperature fixed around 15 °C throughout northern part open-type ground source pump systems can be used cooling heating there, if adequate quantitative aquifer properties (exploitable amounts) present.