Abstract
It is well reported that landslides occur frequently during a period that a ground water level rises due to the heavy rain and snow melting. To perform a highly precise level of risk evaluation of these landslides the estimation method of ground water level fluctuation is necessary to develop including it for the snow melting period. Therefore, we examined the estimation method of water level fluctuation in consideration of the infiltration effect of snow melting water into under ground in snow melting period. The estimation method suggested the Ψ function method that calculates the maximum correlation in the observation values of ground water level and the estimated values analyzing effective snow melting amount by GA algorithm method. The presented method confirms the validity and precision through a comparison between the actual field observation data and estimation results.
