IEG 환경지질연구정보센터

10월 25일(목)․지하수학

200 2007 추계지질과학연합학술대회 초록집

Numerical Calibration of Hydraulic and Thermal Properties in Daesan Riverbank Filtration Area for Geothermal Energy

Utilization

Jiyoun Shin

․Kyeong-Ho Kim

․Gwang-Ok Bae

․Kang-Kun Lee

․ Woosung Jung

․ Heejun Suk

1

Seoul National University, Seoul, Korea, [email protected]

2

Korea Water Resource Corporation, Daejeon, Korea

Riverbank filtration is a kind of artificial aquifer recharge for the fresh water supply. By construction of several production wells penetrating the riverbank, surface water withdrawn from the river would pass riverbed. This extracted water is well known to be cooler than surface water in summer and warmer than surface water in winter, resulting in a more constant water temperature. This characteristic of extracted water is applied to geothermal energy utilization.

Prediction of the annual temperature variation of filtrated water is the major concern in this study.

In Daesan-myeon, Changwon-si, Gyeongsangnam-do, South Korea, riverbank filtration facility has been on its operation for municipal water supply and thermal energy utilization since 2006. Appropriate hydraulic and thermal properties were estimated for flow and heat transfer modeling with given pumping rate and location. With the calibrated material proper- ties and boundary conditions, we numerically reproduced measured head and temperature variation with acceptable error range. In the numerical simulation, the change of saturation ratio and river stage caused by rainfall was calculated and the resulting variation of thermal capacity and thermal conductivity was considered.

Acknowledgement : This study was financially supported by Korea Energy Management Corporation through KIGAM and BK 21 project of the Korean Government.

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