Landslide Susceptibility Assessment Using Combined TRIGRS and Flow-R

Ahmad Rifa'i; Ragil A. Yuniawan; Fikri Faris; Tiara R. Trisnawati; Byon Rezy Pradana Purba; Andy Subiyantoro; Eka Priangga Hari Suryana; Banata Wahid Ridwan

doi:10.28991/CEJ-2025-011-03-020

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Ahmad Rifa'i
ahmad.rifai@ugm.ac.id
Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta 55281,, Indonesia
Ragil A. Yuniawan 1) Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia. 2) Balai Teknik Sabo, Direktorat Bina Teknik, Ministry of Public Works and Housing, Yogyakarta 55282, Indonesia.
Fikri Faris Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta 55281,, Indonesia
Tiara R. Trisnawati Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta 55281,, Indonesia
Byon Rezy Pradana Purba Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta 55281,, Indonesia
Andy Subiyantoro 3) Faculty of Geoinformation Science and Earth Observation (ITC), University of Twente, Enschede 7514 AE, The Netherlands. 4) Balai Besar Wilayah C3, Direktorat Jenderal Sumber Daya Air, Ministry of Public Works and Housing, Banten 206111, Indonesia.
Eka Priangga Hari Suryana Balai Teknik Sabo, Direktorat Bina Teknik, Ministry of Public Works and Housing, Yogyakarta 55282,, Indonesia
Banata Wahid Ridwan Balai Teknik Sabo, Direktorat Bina Teknik, Ministry of Public Works and Housing, Yogyakarta 55282,, Indonesia

Vol. 11 No. 3 (2025): March

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Landslides were addressed as one of the natural hazards that can create extensive disasters. Effective assessment to locate potential landslide events is crucial for planning and risk mitigation. This study, which is located in the Sumitro watershed, Kulon Progo, Yogyakarta, presents a novel approach to landslide susceptibility assessment by integrating the Transient Rainfall Infiltration and Grid-Based Regional Slope-Stability Model (TRIGRS) with the Flow-R model. Five key parameters, namely slope, soil properties, groundwater level, soil thickness, and rainfall, were used to create the landslide susceptibility zonation. TRIGRS was used to identify the landslide initiation, while Flow-R was used to create the run-out area. The result was then validated through statistical evaluation using Area Under Curve (AUC) based on the landslide inventory. Results show that landslide susceptibility zonation created from TRIGRS alone resulted in an AUC value of 0.679, while the combination of TRIGRS-Flow-R susceptibility zonation shows a better AUC value of 0.728. The increase of the AUC value of almost 0.05 has enhanced the correlation between the landslide susceptibility zonation and landslide inventory from "acceptable” to "excellent” correlation. This result demonstrates that integrating Flow-R with TRIGRS improves the performance of landslide susceptibility zonation. This study offers a new perspective on creating landslide susceptibility zonation by combining two methods, yielding more reliable results.

Doi: 10.28991/CEJ-2025-011-03-020

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Landslide Susceptibility Assessment Using Combined TRIGRS and Flow-R

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