Slope stability and rockfall assessment of volcanic tuffs using RPAS with 2-D FEM slope modelling
| Autor: | Péter Görög, Gyula Bögöly, Ákos Török, Tamás Lovas, Árpád Somogyi, Árpád Barsi |
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| Rok vydání: | 2018 |
| Předmět: |
0211 other engineering and technologies
Terrain 02 engineering and technology Hazard analysis 010502 geochemistry & geophysics 01 natural sciences lcsh:TD1-1066 Rockfall Slope stability lcsh:Environmental technology. Sanitary engineering Digital elevation model Joint (geology) lcsh:Environmental sciences 0105 earth and related environmental sciences Remote sensing lcsh:GE1-350 021110 strategic defence & security studies geography geography.geographical_feature_category lcsh:QE1-996.5 lcsh:Geography. Anthropology. Recreation Raised-relief map lcsh:Geology lcsh:G GNSS applications General Earth and Planetary Sciences Geology |
| Zdroj: | Natural Hazards and Earth System Sciences, Vol 18, Pp 583-597 (2018) |
| ISSN: | 1684-9981 |
| DOI: | 10.5194/nhess-18-583-2018 |
| Popis: | Steep, hardly accessible cliffs of rhyolite tuff in NE Hungary are prone to rockfalls, endangering visitors of a castle. Remote sensing techniques were employed to obtain data on terrain morphology and to provide slope geometry for assessing the stability of these rock walls. A RPAS (Remotely Piloted Aircraft System) was used to collect images which were processed by Pix4D mapper (structure from motion technology) to generate a point cloud and mesh. The georeferencing was made by Global Navigation Satellite System (GNSS) with the use of seven ground control points. The obtained digital surface model (DSM) was processed (vegetation removal) and the derived digital terrain model (DTM) allowed cross sections to be drawn and a joint system to be detected. Joint and discontinuity system was also verified by field measurements. On-site tests as well as laboratory tests provided additional engineering geological data for slope modelling. Stability of cliffs was assessed by 2-D FEM (finite element method). Global analyses of cross sections show that weak intercalating tuff layers may serve as potential slip surfaces. However, at present the greatest hazard is related to planar failure along ENE–WSW joints and to wedge failure. The paper demonstrates that RPAS is a rapid and useful tool for generating a reliable terrain model of hardly accessible cliff faces. It also emphasizes the efficiency of RPAS in rockfall hazard assessment in comparison with other remote sensing techniques such as terrestrial laser scanning (TLS). |
| Databáze: | OpenAIRE |
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