International Snow Science Workshop Proceedings - Montana State University Library

Item: The Upgraded Full-Scale Avalanche Test-Site Ryggfonn, Norway

• • Title: The Upgraded Full-Scale Avalanche Test-Site Ryggfonn, Norway

    Proceedings: 2010 International Snow Science Workshop

    Authors:

    • Peter Gauer  [ Norwegian Geotechnical Institute, Sognsveien 72, NO-0806 Oslo, Norway ]
    • Hedda Breien  [ Norwegian Geotechnical Institute, Sognsveien 72, NO-0806 Oslo, Norway ]
    • Dieter Issler  [ Norwegian Geotechnical Institute, Sognsveien 72, NO-0806 Oslo, Norway ]
    • Krister Kristensen  [ Norwegian Geotechnical Institute, Sognsveien 72, NO-0806 Oslo, Norway ]
    • Kalle Kronholm  [ Norwegian Geotechnical Institute, Sognsveien 72, NO-0806 Oslo, Norway ]
    • Erik Lied  [ Norwegian Geotechnical Institute, Sognsveien 72, NO-0806 Oslo, Norway ]
    • Karstein Lied  [ Norwegian Geotechnical Institute, Sognsveien 72, NO-0806 Oslo, Norway ]

    Date: 2010

    Abstract: Measurements of full-scale avalanches are expensive and time consuming, but are indispensable to gain in-depth understanding of the flow behavior of avalanches. They are needed to crosscheck the scaling used in small-scale experiments and also form the basis for developing and calibrating numerical models. The recent partial upgrade of NGI’s Ryggfonn test-site is focused on the processes occurring during interaction between avalanches and a catching dam in the runout zone. These processes are crucial for the efficiency of this type of avalanche mitigation measure, which has been the focus of several small-scale experiments in recent years. But qualitatively and quantitatively good observations from real avalanches for a crosscomparison are rare. Therefore, two new masts were constructed at Ryggfonn. One is located about 10 m upstream of the foot of a catching dam and has a height of 15 m. The other stands on the crown of the dam and is 6 m high. In this way, we also hope to complement the SLF full-scale tests at the Vall ´ee de la Sionne test-site. Instrumentation on the new masts consists of load-cells and LED-velocity sensors, each type with a vertical spacing of 0.5 m. In addition, flow-height switches are placed with 0.25 m vertical spacing. Thus, the instrumentation is quite similar to the instrumentation used in Vall ´ee de la Sionne, which will hopefully allow better cross-comparison of measurements. We present the upgraded set-up and show preliminary results from the first measurements.

    Object ID: ISSW_P-084.pdf

    Language of Article: English

    Presenter(s): Unknown

    Keywords: test site, catching dam, runout zone, slf full-scale tests

    Page Number(s): 747-752

    Subjects: ryggfonn, norway full-scale avalanche ngi’s ryggfonn test-site

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