For testing the potential and increased usage of a ground source heat pump system (GSHP), chemical and isotopic (D, ¹⁸O) compositions of 50 shallow groundwater and six river water samples in Joganji and Toyama alluvial fans, central Japan, were analyzed to examine their water quality and origins with the simulation of the fluid flow mode using a 3-D state flow (transient) model. Results showed that groundwater was mainly a mixture of the Joganji River water and precipitation and moved from east to west. The groundwater flow velocity was estimated at 4–10 m/day, and the residence time could reach 10 years. The saturation indices of scaling components (deposit on heat exchanger) such as Fe and CaCO₃ were discussed for the safe use of the GSHP.

为了测试地源热泵系统（GSHP）的潜力和增加的使用，分析了日本中部Joganji和Toyama冲积扇中50种浅层地下水和6种河水样品的化学和同位素（D，¹⁸ O）组成，使用3-D状态流（瞬态）模型对流体流动模式进行仿真，以检查它们的水质和来源。结果表明，地下水主要是Joganji河水和降水的混合，并从东向西流动。地下水流速估计为4-10 m / day，停留时间可能达到10年。为了安全使用GSHP，讨论了结垢成分（沉积在热交换器上）如Fe和CaCO ₃的饱和指数。