Mapping the susceptibility of rain-triggered lahars at Vulcano island (Italy) combining field characterization, geotechnical analysis, and numerical modelling
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 descrip...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2020
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| Online Access: | https://hdl.handle.net/10356/137232 |
| _version_ | 1811688985580273664 |
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| author | Baumann, Valérie Bonadonna, Costanza Cuomo, Sabatino Moscariello, Mariagiovanna Biass, Sebastien Pistolesi, Marco Gattuso, Alessandro |
| author2 | Earth Observatory of Singapore |
| author_facet | Earth Observatory of Singapore Baumann, Valérie Bonadonna, Costanza Cuomo, Sabatino Moscariello, Mariagiovanna Biass, Sebastien Pistolesi, Marco Gattuso, Alessandro |
| author_sort | Baumann, Valérie |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T05:40:54Z |
| format | Journal Article |
| id | ntu-10356/137232 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:40:54Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1372322020-09-26T21:31:28Z Mapping the susceptibility of rain-triggered lahars at Vulcano island (Italy) combining field characterization, geotechnical analysis, and numerical modelling Baumann, Valérie Bonadonna, Costanza Cuomo, Sabatino Moscariello, Mariagiovanna Biass, Sebastien Pistolesi, Marco Gattuso, Alessandro Earth Observatory of Singapore Science::Geology Rain-triggered Lahars Geotechnical Analysis 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. Published version 2020-03-10T02:48:20Z 2020-03-10T02:48:20Z 2019 Journal Article Baumann, V., Bonadonna, C., Cuomo, S., Moscariello, M., Biass, S., Pistolesi, M., & Gattuso, A. (2019). Mapping the susceptibility of rain-triggered lahars at Vulcano island (Italy) combining field characterization, geotechnical analysis, and numerical modelling. Natural Hazards and Earth System Sciences, 19(11), 2421-2449. doi:10.5194/nhess-19-2421-2019 1561-8633 https://hdl.handle.net/10356/137232 10.5194/nhess-19-2421-2019 2-s2.0-85074574503 11 19 2421 2449 en Natural Hazards and Earth System Sciences © 2019 Author(s). This work is distributed under the Creative Commons Attribution 4.0 License. application/pdf |
| spellingShingle | Science::Geology Rain-triggered Lahars Geotechnical Analysis Baumann, Valérie Bonadonna, Costanza Cuomo, Sabatino Moscariello, Mariagiovanna Biass, Sebastien Pistolesi, Marco Gattuso, Alessandro Mapping the susceptibility of rain-triggered lahars at Vulcano island (Italy) combining field characterization, geotechnical analysis, and numerical modelling |
| title | Mapping the susceptibility of rain-triggered lahars at Vulcano island (Italy) combining field characterization, geotechnical analysis, and numerical modelling |
| title_full | Mapping the susceptibility of rain-triggered lahars at Vulcano island (Italy) combining field characterization, geotechnical analysis, and numerical modelling |
| title_fullStr | Mapping the susceptibility of rain-triggered lahars at Vulcano island (Italy) combining field characterization, geotechnical analysis, and numerical modelling |
| title_full_unstemmed | Mapping the susceptibility of rain-triggered lahars at Vulcano island (Italy) combining field characterization, geotechnical analysis, and numerical modelling |
| title_short | Mapping the susceptibility of rain-triggered lahars at Vulcano island (Italy) combining field characterization, geotechnical analysis, and numerical modelling |
| title_sort | mapping the susceptibility of rain triggered lahars at vulcano island italy combining field characterization geotechnical analysis and numerical modelling |
| topic | Science::Geology Rain-triggered Lahars Geotechnical Analysis |
| url | https://hdl.handle.net/10356/137232 |
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