Heni Masruroh, Syamsul Bachri, Purwanto, Sumarmi, Bintang Harfian, Miftakhul Firdaus, Kresno Sastro Bangun Utomo, Zukhrufia Rahmi
Landslide prediction is currently a crucial part of disaster risk management. Geomorphological mapping provides basic and essential information for analyzing landslide-prone areas. This study aims to explore and map the geomorphological characteristics that contribute to landslide movement processes in the Dilem Wilis Watershed. This study adopts a mixed-methods approach that integrates field-based geomorphological surveys and the optimization of remote sensing data, particularly the utilization of high-resolution national digital elevation data (DEMNAS), to understand landslide mechanisms in the Ngrowo-Ngasinan sub-watershed. The results indicate that geomorphological characteristics play a significant role in the spatial distribution and mechanisms of landslides in the Ngrowo-Ngasinan sub-watershed. Landslides predominantly occur in complex geological settings with structural (±58%) and volcanic (±36%) morphogenesis, steep hills (±33%) and mountainous (±28%) zones. Within the morphoarrangement context, the middle slope (±30%) and upper slope (±26%) zones are the most landslide-prone areas because they function as slope material release zones, supported by pore water pressure and topographical positions that facilitate downward soil mass movement. The Tomi and Tmwl Formations, composed of volcanic breccia and tuff, have a clay texture easily saturated with water. Mapping conducted in the Ngrowo-Ngasinan watershed, consisting of morphology, morphoarrangement, morphogenesis, and morphochronology mapping, resulted in data analysis of 29 landform units. At a more detailed scale of 10 meters, it can be identified that landslide movement is increasing in the study area due to human intervention in slope cutting for roads, thus increasing the risk of damage to agroforestry plants. © Published under licence by IOP Publishing Ltd.
Geography Department, Faculty of Social Science, Universitas Negeri Malang, Malang, Indonesia; Center of Environment and Disaster Mitigation, Universitas Negeri Malang, Malang, Indonesia; Faculty of Social Science, Universitas Negeri Malang, Malang, Indonesia
