Dune bedfroms generated by pyroclastic density currents

• Applicant: Dr. Ulrich Küppers
• Subject Area: Palaeontology
• Term: from 2012 to 2015
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 207474467

• Final Report Year: 2016

Final Report Abstract

Rather than bringing hasty and fixed new interpretations as answers, the project was strongly based on thorough documentation and description of natural examples. This permitted to challenge traditional interpretations in term of dynamics of formation for the dune bedforms (and the antidune interpretation), to open up new possibilities in the interpretation of PDC deposits, and use sedimentary features that were often disregarded in traditional analysis. The wind tunnel measurements are a tool for quantification of flow velocities based on field observation. The variety of methods that were used permitted to obtain a strong dataset. Rather than answers, this brought new ideas and questions that will be investigated in the future project.

Publications

• (2013) Dune bedforms produced by dilute pyroclastic density currents from the August 2006 eruption of Tungurahua volcano, Ecuador. Bulletin of Volcanology 75:762
  Douillet GA, Pacheco DA, Kueppers U, Letort J, Tsang-Hin-Sun E, Bustillos J, Hall M, Ramón P, Dingwell DB
  (See online at https://doi.org/10.1007/s00445-013-0762-x)
• (2013) Sedimentology and geomorphology of the deposits from the August 2006 pyroclastic density currents at Tungurahua volcano, Ecuador. Bulletin of Volcanology 75:765
  Douillet GA, Tsang-Hin-Sun E, Kueppers U, Letort J, Pacheco DA, Goldstein F, Von Aulock F, Lavallée Y, Hanson JB, Bustillos J, Robin C, Ramón P, Hall M, Dingwell DB
  (See online at https://doi.org/10.1007/s00445-013-0765-7)
• (2014) Saltation threshold for pyroclasts at various bedslopes: Wind tunnel measurements. Journal of Volcanology and Geothermal Research 278-279, 14-24
  Douillet GA, Rasmussen KR, Kueppers U, Lo Castro D, Merrison JP, Iversen JJ, Dingwell DB
  (See online at https://doi.org/10.1016/j.jvolgeores.2014.03.011)
• (2015) Sequential plug formation, desintegration by Vulcanian explosions, and the generation of granular pyroclastic density currents at Tungurahua volcano (2013-2014), Ecuador. Journal of Volcanology and Geothermal Research
  Hall ML, Steele AL, Bernard B, Mothes PA, Vallejo SX, Douillet GA, Ramon PA, Aguaiza SX, Ruiz MC
  (See online at https://doi.org/10.1016/j.jvolgeores.2015.09.009)
• (2015) Syn-eruptive, soft-sediment deformation of dilute pyroclastic density current deposits: triggers from granular shear, dynamic pore pressure, ballistic impacts and shock waves. Solid Earth, 6, 553-572
  Douillet GA, Taisne B, Tsang-Hin-Sun E, Müller SK, Kueppers U, Dingwell DB
  (See online at https://doi.org/10.5194/se-6-553-2015)