Icing of a 328 m tall tower: A case study

Lasse Makkonen, Gregory Thompson, Bjørn Egil K. Nygaard, Pertti Lehtonen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    We present detailed field observations of an icing event on a 326 m tall guyed television tower. Ice samples were collected and photos taken from various heights on the tower which was equipped with anti-iced anemometers and thermometers at five levels. Modeling of the accumulation of ice on the tower was made by the Weather Research and Forecasting model combined with a numerical icing model. The simulated time series of temperature, wind velocity, cloud and drizzle liquid water contents and median volume droplet sizes were used to drive the icing model. The measured vertical distribution of the ice load was compared with that modeled by the WRF simulations. The cloud microphysics scheme and WRF provide remarkably accurate predictions of the meteorological conditions and result in very useful estimates of the ice loads at different levels on the tower. We also used a simple icing model, based on the observed weather data, to estimate the ice load. The results from both models support the approximate height distribution of ice mass proposed in the ISO 12494 code for atmospheric icing.
    Original languageEnglish
    Title of host publication15th International Workshop on Atmospheric Icing of Structures, IWAIS 2013
    Pages3-37 - 3-42
    Publication statusPublished - 2013
    MoE publication typeA4 Article in a conference publication
    Event15th International Workshop on Atmospheric Icing of Structures, IWAIS 2013 - St. John's, Canada
    Duration: 8 Sep 201311 Sep 2013

    Conference

    Conference15th International Workshop on Atmospheric Icing of Structures, IWAIS 2013
    Abbreviated titleIWAIS 2013
    Country/TerritoryCanada
    CitySt. John's
    Period8/09/1311/09/13

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