Numerical Model of the Low Temperature Geothermal Area for Direct use in Pohang, South Korea

We determined the horizontal boundary of a watershed in the study area for numerical simulation, in order to facilitate the direct use of geothermal water. The geothermal gradient of the research well is about 30.0 °C/km and the measured temperature is 91 °C at a depth of 2000 m. The initial water table is located at 360 m depth and 32.6 m drawdown was observed when the pumping rate was 400 m3/day over 55 hours. Coupled fluid and heat transport simulations were conducted using the data of hydraulic tests and well inventory. In order to test the numerical model we used several pumping rates and a recharge rate. Simulated water levels at layers of the numerical model were evaluated from the hydrogeologic data of the study area.