Analyses of groundwater level fluctuation in a landslide site using the effective rainfall method incorporating the effect of snowmelt and evapotranspiration

Although the effective rainfall method has been widely used for analyzing groundwater level fluctuation in landslide sites, few previous studies have applied the method to snow-cover area throughout a year. This study estimated snowmelt by a simple and easy way, and analyzed groundwater level fluctuation in a landslide site in snow-cover area throughout a year using the effective meltwater and/or rainwater (MR). The results suggested that the groundwater level can be reproduced using the effective MR, and that incorporating the effect of evapotranspiration can improve the accuracy.