Four-Year Monitoring Study of Shallow Landslide Hazards Based on Hydrological Measurements in a Weathered Granite Soil Slope in South Korea

To build a comprehensive understanding of long-term hydro-mechanical processes that lead to shallow landslide hazards, this study explicitly monitored the volumetric water content (VWC) and rainfall amount for weathered granite soil slope over four year period. From 12 operational monitoring stations installed across South Korea, Songnisan station was selected as site. VWC sensors were placed in subsurface with grid-like arrangement at depths 0.5 1.0 m. Shallow hazards evaluated by applying an infinite stability model adopted previously proposed unified effective stress concept. By analyzing variations values, derived matric suctions suction stresses, calculated factor safety we able obtain numerous valuable insights. In particular, seasonal effects drainage evapotranspiration on moisture conditions addressed. Preliminary test results indicated continuous successfully represented depth m lower slope, although not case upper middle slopes. The significance future cumulative field data from various sites different geological is highlighted.