In this study, a method of leakage detection was proposed to locate leak position for a reservoir pipeline valve system using wavelet coherence analysis for an injected pressure wave. An unsteady flow analyzer handled nonlinear valve maneuver and corresponding experimental result were compared. Time series of pressure head were analyzed through wavelet coherence analysis both for no leak and leak conditions. The leak information can be obtained through either time domain reflectometry or the difference in wavelet coherence level, which provide predictions in terms of leak location. The reconstructed pressure signal facilitates the identification of leak presence comparing with existing wavelet coherence analysis.

ABSTRACT
1. 서 론
2. 실험장치 및 방법
    2.1 실험 관로 시스템
    2.2 휴대용 압력파 발생장치
    2.3 관로에서의 지배방정식
    2.4 특성선 방법
    2.5 Wavelet 일관성 분석
3. 실험결과
    3.1 시간 영역에서의 모의결과 및 실험결과
    3.2 Wavelet 일관성 분석을 통한 모의결과 및 실험결과
    3.3 누수 크기에 따른 Wavelet 일관성 결과 비교
4. 실험결과 고찰
    4.1 원신호 및 재건신호 결과 비교 및 고찰
5. 결 론
References

• 고동원(부산대학교 공과대학 사회환경시스템공학과) | Dongwon Ko (Department of Civil and Environmental Engineering, Pusan National University)
• 이정섭(부산대학교 공과대학 사회환경시스템공학과) | Jeongseop Lee (Department of Civil and Environmental Engineering, Pusan National University)
• 김진원(수자원기술주식회사) | Jinwon Kim (Water Resources Engineering Corporation)
• 김상현(부산대학교 공과대학 사회환경시스템공학과) | Sanghyun Kim (Department of Civil and Environmental Engineering, Pusan National University) Corresponding author