Abstract
Groundwater levels around the water sealed rock cavern are greatly fluctuating by the influence of not only precipitation, air pressure and earth tide, but also changes of water supply for water curtain control. It is very important for maintenance and control of water curtain functions to detect a minor fluctuation caused by changing hydrological structure with earthquake or others in the greatly fluctuated observed values. In this paper, it is shown that the effect of meteorological phenomena can be clearly separated by statistical time series analysis and that the changes of hydrological structure can be detected. It's also shown that the proposed methods are available for the maintenance system.
