Implications of terrain resolution on modeling rainfall-triggered landslides using a TIN- based model. (July 2021)

• Record Type: Journal Article
• Authors: Arnone, E.; Francipane, A.; Dialynas, Y.G.; Noto, L.V.; Bras, R.L.
• Is Part Of: Environmental modelling & software. Volume 141(2021)
• Publication Date: 2021-07
• Subjects: Hydrologic modeling -- Landslides -- Numerical modeling -- Digital elevation models -- Slope stability analysis; Environmental monitoring -- Computer programs -- Periodicals; Ecology -- Computer simulation -- Periodicals; Digital computer simulation -- Periodicals; Computer software -- Periodicals; Environmental Monitoring -- Periodicals; Computer Simulation -- Periodicals; Environnement -- Surveillance -- Logiciels -- Périodiques; Écologie -- Simulation, Méthodes de -- Périodiques; Simulation par ordinateur -- Périodiques; Logiciels -- Périodiques; Computer software; Digital computer simulation; Ecology -- Computer simulation; Environmental monitoring -- Computer programs; Periodicals; Electronic journals; 363.70015118
• DOI: 10.1016/j.envsoft.2021.105067
• Languages: English
• ISSNs: 1364-8152

Abstract

Abstract: This study employs a distributed eco-hydrological-landslide model, the tRIBS-VEGGIE-Landslide, to evaluate the influence of terrain resolution on the hydro-geomorphological processes involved in slope stability analysis. The model implements a Triangulated Irregular Network (TIN) to describe the topography starting from a grid-DEM. Five grid-DEM resolutions of the case study basin, i.e., 10, 20, 30 and 70 m, are used to derive the corresponding TINs. The results show that using irregular meshes reduces the loss of accuracy with coarser resolutions in the derived slope distribution in comparison to slope distributions estimated from the original grid-based DEM. From a hydrological perspective, the impact of resolution on soil moisture patterns and on slope stability is significant mostly when lateral water exchanges are allowed. The degrading of resolution leads to a reduction of the predicted unstable areas, with respect to the highest resolution case, from about 15% (20 m) to more than 40% (70 m). Highlights: Impacts of five grid-DEM resolutions on hydrologic-stability modeling are assessed. The model uses Triangulated Irregular Networks to describe the topography. We analyze direct and indirect effects of hydro-geomorphic processes involved. Resolution impacts triggering processes when lateral water exchanges are allowed.