Seismic intensity deduced from instrumental data has been evaluated using the empirical relationship between intensity and peak ground acceleration (PGA) during an earthquake. The Japan Meteorological Agency (JMA) developed a seismic intensity meter, which can estimate the real-time seismic intensity from seismic motions observed at a local site to evaluate the damage during the earthquake more correctly. This paper proposes a practical application of the JMA intensity to dams during the 2013 earthquake in Yeongcheon, Korea. In the present paper, seismic intensity was estimated from the relationships between accelerations observed at Yeongcheon Dam. Estimated seismic intensities were in the range of 0 to 3, which was verified from the displacements of dams and the variation of the ground water level observed at Yeongcheon dam during the earthquake. The JMA intensity, which is determined by considering the frequency, duration of cyclic loading, etc., was 0 (zero) and there was no damage to Yeoncheon dam during the earthquake.

필댐의 경우 일반적으로 저수위, 간극수압계, 누수량계 및 정상침하계 등을 이용하여 안전관리를 수행하고 있다. 상기 계측기의 설치 목적은 대부분 공사 중 안정성과 관련 있지만 댐 완공 후 관리중인 시점에서는 주로 계측기의 경시변화만 분석하여 그 활용도가 저하되었다. 따라서 본 연구로 주성분 분석을 통해 저수위-간극수압계의 상관성은 높은 것으로 나타났고 간극수압계 그룹 내에서의 상호 상관관계로부터 그룹 내 계측기들이 상호대체 될 수 있는 것으로 판단된다. 또한 향후 미계측 값의 추정 및 이상값 제거를 위한 유용한 정보로 활용할 수 있을 것으로 판단된다.

Deformation monitoring of dams has been widely used for its safety management. In this study, improvement of the deformation monitoring with a total station was suggested by calibrating coordinate of a total station. The position of TS was initially measured through 3∼4 given points and the coordinate of total station was considered as an absolute value. However, when the targeting point was measured by the total station, the coordinate of the total station was changed and it means that deformation of the total station was also occurred. Therefore, the deformation of dams was increased by deformation of the total station. Before the calibrating, the deformation of the target point located at 50m from total station was ±20mm. After the calibrating, the deformation was decreased by ±2mm.