Hydro–Mechanical Behaviour of a Rainfall-Induced Landslide by Instrumental Monitoring: Landslide–Rainfall Threshold of the Western Black Sea Bartin Region of Türkiye

Bartin City is located in the Western Black Sea Region of Türkiye, where rainfall-induced landslides are more frequently observed. Although it known that many induced by rainfall, there limited knowledge regarding how rainfall triggers these city. To clarify triggering mechanisms landslides, a detailed field monitoring program was performed on chosen area to represent Bartin. The instrumentation included measurements site suction, volumetric water content, groundwater level, and amount over period two years. Various stability analyses were pore pressures after both transient flow infiltration analysis site-measured suction values. intensity–duration thresholds obtained for dry wet periods as result numerical means parameters from monitoring. results show conditions create critical before failure compared conditions, so occur easily periods. According landslide–rainfall threshold relations, landslide-risk limits reached if intensity 10 mm/h lasts between 0.85 h 17 depending saturated hydraulic conductivity soil. When intensities less than mm/h, longer durations needed landslide occur. For periods, situations encountered 1 continues 0.36 h–3.67 h, conductivities.