Suchergebnisse

Abstract. The characterization of triggering dynamics and remobilized volumes is crucial to the assessment of associated lahar hazards. We propose an innovative treatment of the cascading effect between tephra fallout and lahar hazards based on probabilistic modelling that also accounts for a detailed description of source sediments. As an example, we have estimated the volumes of tephra fallout deposit that could be remobilized by rainfall-triggered lahars in association with two eruptive scenarios that have characterized the activity of the La Fossa cone (Vulcano, Italy) in the last 1000 years: a long-lasting Vulcanian cycle and a subplinian eruption. The spatial distribution and volume of deposits that could potentially trigger lahars were analysed based on a combination of tephra fallout probabilistic modelling (with TEPHRA2), slope-stability modelling (with TRIGRS), field observations, and geotechnical tests. Model input data were obtained from both geotechnical tests and field measurements (e.g. hydraulic conductivity, friction angle, cohesion, total unit weight of the soil, and saturated and residual water content). TRIGRS simulations show how shallow landsliding is an effective process for eroding pyroclastic deposits on Vulcano. Nonetheless, the remobilized volumes and the deposit thickness threshold for lahar initiation strongly depend on slope angle, rainfall intensity, grain size, friction angle, hydraulic conductivity, and the cohesion of the source deposit.

Part I: ICL Landslide Lesson -- Sliding-surface liquefaction and undrained steady-state shear strength -- Identification and Mitigation of Reservoir Landslides Cases Studied in the Three Gorges Reservoir Area of China -- Part II: Original articles -- Impact of input data on the quality of the landslide susceptibility large-scale maps: A case study from NW Croatia -- Landslide warning systems in high-income countries: past accomplishments and expected endeavours -- Modelling of Landslide-Structure Interaction (LSI) through Material Point Method (MPM) -- Landslide Research and Technology in International Standards -- Mathematical and numerical modeling of slope stability for the Mong Sen landslide event in the Trung Chai commune, Sapa, Vietnam -- Landslide early warning system based on the empirical approach - Case study in Ha Long City (Vietnam) -- The modern activity of the Buzulgan landslide and its influence on the debris flow hazard for the Tyrnyauz town (Northern Caucasus, Russia) -- A risk evaluation method of unstable slopes using multipoint tilting sensors -- Part III: IPL/WCOE/KLC2020 -- Community Level Slope Disaster Risk Reduction Program through Multi-Scale Mapping by Mountain Ethnic Group in Northern Vietnam - Project Study by JICA / Lao Cai DARD / ITST -- Landslide Risk Assessment in the tropical zone of Vietnam as a contribution to the mitigation of natural disaster vulnerability -- Protection and conservation of Georgian rupestrian cultural heritage sites: a review -- Spatial and temporal characterization of landslide deformation pattern with Sentinel-1 -- Lessons from 2019-2020 landslide risk assessment in an urban area of volcanic soils in Pereira-Colombia -- Part IV: ICL Landslide Teaching Tools -- Zonation of landslide susceptibility in the Gipuzkoa province (Spain): an application of LAND-SUITE -- Landslide and soil erosion inventory mapping based on high-resolution remote sensing data: A case study from Istria (Croatia) -- Part V: Technical Notes and Case Studies -- Landslide monitoring with RADARSAT Constellation Mission InSAR, RPAS-derived point-clouds and RTK GNSS time-series in the Thompson River Valley, British Columbia, Canada -- Digital terrain models derived from unmanned aerial vehicles and landslide susceptibility -- Use of GIS to assess susceptibility per landform unit to gravitational processes and their volume.