Slope stability and rockfall assessment of volcanic tuffs using RPAS with 2-D FEM slope modelling
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 Pil...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2018-02-01
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| Series: | Natural Hazards and Earth System Sciences |
| Online Access: | https://www.nat-hazards-earth-syst-sci.net/18/583/2018/nhess-18-583-2018.pdf |
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| author | Á. Török Á. Barsi G. Bögöly T. Lovas Á. Somogyi P. Görög |
| author_facet | Á. Török Á. Barsi G. Bögöly T. Lovas Á. Somogyi P. Görög |
| author_sort | Á. Török |
| collection | DOAJ |
| description | 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). |
| first_indexed | 2024-04-13T08:11:28Z |
| format | Article |
| id | doaj.art-74d95cf2f79043c8aadadcfd0faf6bba |
| institution | Directory Open Access Journal |
| issn | 1561-8633 1684-9981 |
| language | English |
| last_indexed | 2024-04-13T08:11:28Z |
| publishDate | 2018-02-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Natural Hazards and Earth System Sciences |
| spelling | doaj.art-74d95cf2f79043c8aadadcfd0faf6bba2022-12-22T02:54:59ZengCopernicus PublicationsNatural Hazards and Earth System Sciences1561-86331684-99812018-02-011858359710.5194/nhess-18-583-2018Slope stability and rockfall assessment of volcanic tuffs using RPAS with 2-D FEM slope modellingÁ. Török0Á. Barsi1G. Bögöly2T. Lovas3Á. Somogyi4P. Görög5Department of Engineering Geology and Geotechnics, Budapest University of Technology and Economics, 1111 Budapest, HungaryDepartment of Photogrammetry and Geoinformatics, Budapest University of Technology and Economics, 1111 Budapest, HungaryDepartment of Engineering Geology and Geotechnics, Budapest University of Technology and Economics, 1111 Budapest, HungaryDepartment of Photogrammetry and Geoinformatics, Budapest University of Technology and Economics, 1111 Budapest, HungaryDepartment of Photogrammetry and Geoinformatics, Budapest University of Technology and Economics, 1111 Budapest, HungaryDepartment of Engineering Geology and Geotechnics, Budapest University of Technology and Economics, 1111 Budapest, HungarySteep, 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).https://www.nat-hazards-earth-syst-sci.net/18/583/2018/nhess-18-583-2018.pdf |
| spellingShingle | Á. Török Á. Barsi G. Bögöly T. Lovas Á. Somogyi P. Görög Slope stability and rockfall assessment of volcanic tuffs using RPAS with 2-D FEM slope modelling Natural Hazards and Earth System Sciences |
| title | Slope stability and rockfall assessment of volcanic tuffs using RPAS with 2-D FEM slope modelling |
| title_full | Slope stability and rockfall assessment of volcanic tuffs using RPAS with 2-D FEM slope modelling |
| title_fullStr | Slope stability and rockfall assessment of volcanic tuffs using RPAS with 2-D FEM slope modelling |
| title_full_unstemmed | Slope stability and rockfall assessment of volcanic tuffs using RPAS with 2-D FEM slope modelling |
| title_short | Slope stability and rockfall assessment of volcanic tuffs using RPAS with 2-D FEM slope modelling |
| title_sort | slope stability and rockfall assessment of volcanic tuffs using rpas with 2 d fem slope modelling |
| url | https://www.nat-hazards-earth-syst-sci.net/18/583/2018/nhess-18-583-2018.pdf |
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