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Item: Automatised Range-Gated Doppler Radar Measurements of a Spontaneously Released Avalanche at the Vallée de la Sionne Test Site

    • Title: Automatised Range-Gated Doppler Radar Measurements of a Spontaneously Released Avalanche at the Vallée de la Sionne Test Site

      Proceedings: International Snow Science Workshop, Davos 2009, Proceedings

      Authors:

      • L. Rammer  [ Federal Research and Training Centre for Forests, Natural Hazards and Landscapes (BFW), Innsbruck, Austria ]
      • H. Schreiber  [ Institute for Communication Technology and Wave Propagation, Technical University Graz, Graz, Austria ]
      • M. Hiller  [ WSL Institute for Snow and Avalanche Research SLF, Davos Dorf, Switzerland ]
      • F. Dufour  [ WSL Institute for Snow and Avalanche Research SLF, Davos Dorf, Switzerland ]
      • B. Sovilla  [ WSL Institute for Snow and Avalanche Research SLF, Davos Dorf, Switzerland ]
      • P. Gauer  [ Federal Research and Training Centre for Forests, Natural Hazards and Landscapes (BFW), Innsbruck, Austria ]
      • M.A. Kern  [ Federal Research and Training Centre for Forests, Natural Hazards and Landscapes (BFW), Innsbruck, Austria ]

      Date: 2009

      Abstract: Range-gated Doppler radar measurements provide decisive information about the motion of an avalanche along the avalanche track. However, up to now, such measurements have been depending on artificial avalanche release: the device had to be started manually at the time of avalanche release. We present an automatised Doppler-radar setup that is installed it the bunker of the Vallée de la Sione test site. The radar measurement is automatically triggered by the geophone triggering device of the test site and autonomously performs range-gated Doppler radar measurements of the avalanche velocity along the track. After shortly lining out on the principle of range-gated in Doppler-radar measurements and on the analysis procedure, we present Doppler-radar data of an avalanche that spontaneously released at the Vallée de la Sionne test site on 17 March 2009. In particular, we track the time evolution of the avalanche velocities in the range gates along the avalanche track to obtain a coherent picure of the avalanche motion from the evolved state to its standstill.

      Language of Article: English

      Presenters: Unknown

      Keywords: avalanche dynamics, radar measurements, spontaneous avalanche

      Page Number(s): 472-476

      Subjects: Doppler radar measurements spontaneous avalanche vallée de la sionne test site

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