Effects of Shallow Groundwater on Deep Groundwater Dynamics in a Slow-Moving Landslide Site

A slow-moving landslide is a mass movement that has major societal impact because of its large sediment volume. The principal cause landslides increased pore water pressure in deep aquifer close to the slip surface. Elucidation behavior groundwater critical stability analysis landslides. Shallow groundwater, which flows through regolith, can undergo vertical infiltration and thus make contribution formation but this not been sufficiently elucidated. aim present study was investigate effects shallow on dynamics regolith. At site, with an area 4200 m2, levels were observed. 1-m-depth temperature survey quality also performed. Water budget using level showed former half rainfall event, infiltrates vertically regolith plays central role raising level. In addition, preferential flow from aquifers suggested be important infiltration. results emphasize importance including when modeling groundwater.