We used numerical models to reliably analyze the groundwater flow and hydraulic conductivity on Jeju Island. To increase reliability, improvements were made to model application factors such as hydraulic watershed classification, groundwater recharge calculation by precipitation, hydraulic conduction calculation using the pilot point method, and expansion of the observed groundwater level. Analysis of groundwater flow showed that the model-calculated water level was similar to the observed value. However, the Seogwi and West Jeju watersheds showed large differences in groundwater level. These areas need to be analyzed by segmenting the distribution of the hydraulic conductivity. Analyzing the groundwater flow in a sub watershed showed that groundwater flow was similar to values from equipotential lines; therefore, the reliability of the analysis results could be improved. Estimation of hydraulic conductivity distribution according to the results of the groundwater flow simulation for all areas of Jeju Island showed hydraulic conductivity > 100 m/d in the coastal area and 1 45 m/d in the upstream area. Notably, hydraulic conductivity was 500 m/d or above in the lowlands of the eastern area, and it was relatively high in some northern and southern areas. Such characteristics were found to be related to distribution of the equipotential lines and type of groundwater occurrence.

Abstract
1. 서 론
2. 지하수 모델 입력자료 구축
    2.1. 소유역경계
    2.2. 지하수 함양량
    2.3. 지층구조
    2.4. 지하수위 자료
    2.5. 수리전도도
    2.6. 격자망 구성
3. 지하수 유동 해석 결과
4. 지하수 수리전도도 특성
    4.1. 모델링 분석을 통한 수리전도도 분포 특성
    4.2. 모델분석에 따른 수리전도도와 지하수 유동특성 비교‧검토
    4.3. 수리전도도의 지하수 양수시험 결과와 비교‧검토
5. 결 론
REFERENCES

• 김민철(제주연구원) | Min-Chul Kim (Jeju Research Institute)
• 양성기(제주대학교 토목공학과) | Sung-Kee Yang (Department of Civil Engineering, Jeju National University) Corresponding author