DEVELOPMENT OF ESTIMATION METHOD OF WATER INFLOW INTO DAM RESERVOIR BASED ON FILTERING THEORY

The inflow into dam reservoir is estimated from the change of hydrostatic water level. It is difficult to obtain the estimation of inflow enough to use for practical dam control using moving average process which is adopted as smoothing method for water level data by almost dam reservoir. The aim of this study is to develop a new estimation method of hydrostatic water level and of inflow into dam reservoir. In this paper, the new smoothing method of water level, which is constituted of the combination of notch filter (NF) and low-pass filter (LPF). In the new method, NF and LPF is used for eliminating a seiche and other random noise, respectively. In the case of Kanayama Dam Reservoir, it would be able to obtain the estimated inflow, in which the power of seiche is cut off enough to use for practical dam control if it is possible to admit 20 minutes time lag of flood peak in the estimated inflow.