Robust experimental study of avalanche precursory events based on reproducible cycles of grain packing destabilizations
Quasi-periodic collective displacements of grains at the free surface of a tilted grain packing constitute precursors of granular avalanches. Laboratory experiments are commonly performed by slowly tilting the packing from 0° to the maximal stability angle θA. In these conditions, the number of prec...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2021-01-01
|
| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2021/03/epjconf_pg2021_03023.pdf |
| _version_ | 1818740003816079360 |
|---|---|
| author | Oger Luc Delannay Renaud Le Gonidec Yves |
| author_facet | Oger Luc Delannay Renaud Le Gonidec Yves |
| author_sort | Oger Luc |
| collection | DOAJ |
| description | Quasi-periodic collective displacements of grains at the free surface of a tilted grain packing constitute precursors of granular avalanches. Laboratory experiments are commonly performed by slowly tilting the packing from 0° to the maximal stability angle θA. In these conditions, the number of precursors is too small to assess reproducible and robust statistical analyses of the precursor activity. To go beyond this limitation, we have developed a specific experimental protocol consisting of tilting the packing with successive oscillation cycles. We use a high-resolution optical camera and process the images of the packing free surface to identify precursory events during many consecutive cycles of a single packing. We observe the same behavior for all half-cycles, forth and back: appearance of the first precursors after the same variation of inclination, exponential evolution of the weak surface activity for the first precursors and linear growth of stronger surface activity for the following ones. The experimental protocol provides both reproducible precursor measurements based on large sample statistical inferences and a quasi-stationary state after one full-cycle. This approach is very promising for highlighting the effects of external parameters, including humidity and packing geometry. |
| first_indexed | 2024-12-18T01:33:49Z |
| format | Article |
| id | doaj.art-3fcbf3c57f874ac78c8c33f5f7381599 |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-12-18T01:33:49Z |
| publishDate | 2021-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-3fcbf3c57f874ac78c8c33f5f73815992022-12-21T21:25:32ZengEDP SciencesEPJ Web of Conferences2100-014X2021-01-012490302310.1051/epjconf/202124903023epjconf_pg2021_03023Robust experimental study of avalanche precursory events based on reproducible cycles of grain packing destabilizationsOger Luc0Delannay Renaud1Le Gonidec Yves2Univ. Rennes, CNRS, IPR [(Institut de Physique de Rennes)]-UMR 6251Univ. Rennes, CNRS, IPR [(Institut de Physique de Rennes)]-UMR 6251Univ. Rennes, CNRS, Géosciences Rennes-UMR 6118Quasi-periodic collective displacements of grains at the free surface of a tilted grain packing constitute precursors of granular avalanches. Laboratory experiments are commonly performed by slowly tilting the packing from 0° to the maximal stability angle θA. In these conditions, the number of precursors is too small to assess reproducible and robust statistical analyses of the precursor activity. To go beyond this limitation, we have developed a specific experimental protocol consisting of tilting the packing with successive oscillation cycles. We use a high-resolution optical camera and process the images of the packing free surface to identify precursory events during many consecutive cycles of a single packing. We observe the same behavior for all half-cycles, forth and back: appearance of the first precursors after the same variation of inclination, exponential evolution of the weak surface activity for the first precursors and linear growth of stronger surface activity for the following ones. The experimental protocol provides both reproducible precursor measurements based on large sample statistical inferences and a quasi-stationary state after one full-cycle. This approach is very promising for highlighting the effects of external parameters, including humidity and packing geometry.https://www.epj-conferences.org/articles/epjconf/pdf/2021/03/epjconf_pg2021_03023.pdf |
| spellingShingle | Oger Luc Delannay Renaud Le Gonidec Yves Robust experimental study of avalanche precursory events based on reproducible cycles of grain packing destabilizations EPJ Web of Conferences |
| title | Robust experimental study of avalanche precursory events based on reproducible cycles of grain packing destabilizations |
| title_full | Robust experimental study of avalanche precursory events based on reproducible cycles of grain packing destabilizations |
| title_fullStr | Robust experimental study of avalanche precursory events based on reproducible cycles of grain packing destabilizations |
| title_full_unstemmed | Robust experimental study of avalanche precursory events based on reproducible cycles of grain packing destabilizations |
| title_short | Robust experimental study of avalanche precursory events based on reproducible cycles of grain packing destabilizations |
| title_sort | robust experimental study of avalanche precursory events based on reproducible cycles of grain packing destabilizations |
| url | https://www.epj-conferences.org/articles/epjconf/pdf/2021/03/epjconf_pg2021_03023.pdf |
| work_keys_str_mv | AT ogerluc robustexperimentalstudyofavalancheprecursoryeventsbasedonreproduciblecyclesofgrainpackingdestabilizations AT delannayrenaud robustexperimentalstudyofavalancheprecursoryeventsbasedonreproduciblecyclesofgrainpackingdestabilizations AT legonidecyves robustexperimentalstudyofavalancheprecursoryeventsbasedonreproduciblecyclesofgrainpackingdestabilizations |