Yuli Fajarwati, Elviana, Rheza Tri Nugroho
Landslides pose significant hazards in regions with steep terrain and high rainfall. This study evaluates landslide potential in Kalirejo Village, Kokap District, using integrated geotechnical and hydrological approaches. A total of 120 survey points were analysed, with soil samples collected from nine hamlets at depths of 20-50 cm. Laboratory tests provided soil classification and estimated shear strength parameters. Rainfall analysis using JAXA GSMaP data (2019-2024) and Log-Pearson III distribution yielded a 10-year design rainfall of 243 mm/day. SEEP/W simulations of 199.8 mm infiltration over 5 hours revealed pore-water pressure increases up to +120 kPa in Plampang I, categorized as High susceptibility. SLOPE/W analysis showed Factors of Safety as low as 1.08 in Papak and 1.16 in Plampang I, confirming marginal stability, while Sangon I and Plampang II remained stable (FoS > 1.7). These results emphasize the role of transient infiltration in triggering shallow landslides and support sustainable disaster risk reduction through slope drainage design and early warning systems. © Published under licence by IOP Publishing Ltd.
Department of Civil Engineering and Planning, Faculty of Engineering, Universitas Negeri Yogyakarta, Yogyakarta, Indonesia; Department of Civil Engineering, Faculty of Vocational, Universitas Negeri Yogyakarta, Yogyakarta, Indonesia
