Abstract
Distribution of the darcy velocity of groundwater flow in aquifers in the Nobi plain is estimated to understand suitable area for installation of ground-coupled heat pumps. The velocity of groundwater flow is calculated from hydraulic gradient and permeability coefficient of aquifers. Distribution of hydraulic gradient is estimated from interpolated distribution of water table of wells using kriging. Permeability coefficient of aquifers is assumed to be a constant value of 10-3m/s. In any area of the Nobi plain, the velocity of groundwater flow in the aquifer is not expected to be >10-5m/s. In the most part of the alluvial fan area, the gravel is dominant in the formation and the velocity is >10-6m/s. In the southwestern area, the velocity is ≤6.3×10-7m/s. This difference of groundwater velocity would affect effective heat conductivity of formations and heat transfer under the ground.
