Work

Exploring the effect of soil zoning in the TRIGRS and Scoops3D integrated model on the stability of rainfall-induced shallow landslides

Year: 2025

Type: article

Abstract: Nanxi Town, located in Yunyang County within the Three Gorges Reservoir Area of Chongqing, faces high rainfall and frequent geological disasters, causing significant casualties and property damage. Analyzing the stability of rainfall-induced shallow landslides through physical models is crucial for disaster mitigation. Traditional one- and two-dimensional models fail to account for three-dimensional slope changes. This study introduces a three-dimensional physical model by combining the TRIGRS and Scoops3D models to predict the spatiotemporal distribution of landslides. To improve prediction accuracy, soil zoning of the T-S model was optimized using environmental factor frequency ratios and random forest analysis. Soil and hydrological parameters for each zone were determined through indoor experiments and incorporated into the T-S integrated model. The analysis of landslide distribution under varying rainfall durations showed that after 24 hours of rainfall, the potential landslide area increased by 63.46% compared to the natural state. The zoned model also showed higher prediction accuracy, with the %LRclass index 3.08% and 5.54% higher under natural and 24-hour rainfall conditions, respectively. This study integrates TRIGRS and Scoops3D models with optimized soil zoning, providing an effective method for predicting rainfall-induced shallow landslides.

Source: Geomatics Natural Hazards and Risk

DOI: 10.1080/19475705.2025.2608911