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On pulsed Doppler radar measurements of avalanches and their implication to avalanche dynamics.

Gauer, Peter; Kern, Martin; Kristensen, Krister; Lied, Karstein; Rammer, Lambert; Schreiber, Helmut
Journal article
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Gauer_Kristensen_Lied_etal(2007).pdf (Locked)
URI
https://hdl.handle.net/11250/3087548
Date
2007
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  • NGI articles [966]
Original version
Cold Regions Science and Technology, Vol. 50, No. 1-3, pp. 55-71.  
Abstract
Pulsed Doppler radar measurements from several avalanche releases are analyzed to gain an in-depth understanding of avalanche dynamics. A pulsed Doppler radar emits short pulses and samples the echo in distinct time intervals, corresponding to distance intervals (range gates). Frequency analysis of the echo signals, exploiting the Doppler-effect, yields the velocity distribution within the width of a range gate. Thus, it is possible to gain information on the front speed along the track and information on the velocity versus time at a specific location along the track.

In addition to the avalanche velocity, information on the magnitude of accelerations/decelerations along the track can be derived. To this end, the velocities of a pair of adjoining range gates are compared. The acceleration/deceleration values can give hints to parameters in the friction terms of commonly used numerical avalanche models. The derived retarding accelerations imply a behavior different to the one proposed in those models. They also indicate a dependency of the retarding acceleration on the stage of the flow.
Publisher
Elsevier
Journal
Cold Regions Science and Technology
Copyright
Elsevier B.V.

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