Application of a wet snow model to the Münsterland event

Lasse Makkonen, B. Wichura

Research output: Contribution to conferenceConference AbstractScientific

Abstract

A severe wet snow event in the northwest part of Germany (Münsterland area) and in neighbouring regions caused damages of electric power lines and wide-spread outages in November 2005. The paper shortly surveys the event, the damages and the meteorological preconditions. Meteorological conditions (temperature and relative humidity) corresponded to wet snow accretion conditions during almost all the time of the event. Maximum wet-snowloads of approximately 50 N/m occurred. They were estimated by evaluation of the snow density from meteorological data and by analysis of diameter of ice accretion from photographs. The wet snow accretion model of Makkonen (1989) was applied to reconstruct the accretion process in time. The paper shows, that the maximum wet-snow load estimates based on observations are in good agreement with the model results when the snow density is estimated asa function of wind velocity (Poots, 1995) and the model input parameter (visibility) is adjusted by a constant factor of 0.5 for night-time observations, as proposed by Rasmussen et al. (1999).
Original languageEnglish
Publication statusPublished - 2009
MoE publication typeNot Eligible
Event13th International Workshop on Atmospheric Icing of Structures, IWAIS 2013 - Andermatt, Switzerland
Duration: 8 Nov 200911 Nov 2009

Workshop

Workshop13th International Workshop on Atmospheric Icing of Structures, IWAIS 2013
Abbreviated titleIWAIS 2013
CountrySwitzerland
CityAndermatt
Period8/11/0911/11/09

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snow
accretion
power line
damage
visibility
photograph
relative humidity
wind velocity
ice
temperature

Cite this

Makkonen, L., & Wichura, B. (2009). Application of a wet snow model to the Münsterland event. Abstract from 13th International Workshop on Atmospheric Icing of Structures, IWAIS 2013, Andermatt, Switzerland.
Makkonen, Lasse ; Wichura, B. / Application of a wet snow model to the Münsterland event. Abstract from 13th International Workshop on Atmospheric Icing of Structures, IWAIS 2013, Andermatt, Switzerland.
@conference{b36e71c49ce1467abe19e914e627e2e7,
title = "Application of a wet snow model to the M{\"u}nsterland event",
abstract = "A severe wet snow event in the northwest part of Germany (M{\"u}nsterland area) and in neighbouring regions caused damages of electric power lines and wide-spread outages in November 2005. The paper shortly surveys the event, the damages and the meteorological preconditions. Meteorological conditions (temperature and relative humidity) corresponded to wet snow accretion conditions during almost all the time of the event. Maximum wet-snowloads of approximately 50 N/m occurred. They were estimated by evaluation of the snow density from meteorological data and by analysis of diameter of ice accretion from photographs. The wet snow accretion model of Makkonen (1989) was applied to reconstruct the accretion process in time. The paper shows, that the maximum wet-snow load estimates based on observations are in good agreement with the model results when the snow density is estimated asa function of wind velocity (Poots, 1995) and the model input parameter (visibility) is adjusted by a constant factor of 0.5 for night-time observations, as proposed by Rasmussen et al. (1999).",
author = "Lasse Makkonen and B. Wichura",
year = "2009",
language = "English",
note = "13th International Workshop on Atmospheric Icing of Structures, IWAIS 2013, IWAIS 2013 ; Conference date: 08-11-2009 Through 11-11-2009",

}

Makkonen, L & Wichura, B 2009, 'Application of a wet snow model to the Münsterland event' 13th International Workshop on Atmospheric Icing of Structures, IWAIS 2013, Andermatt, Switzerland, 8/11/09 - 11/11/09, .

Application of a wet snow model to the Münsterland event. / Makkonen, Lasse; Wichura, B.

2009. Abstract from 13th International Workshop on Atmospheric Icing of Structures, IWAIS 2013, Andermatt, Switzerland.

Research output: Contribution to conferenceConference AbstractScientific

TY - CONF

T1 - Application of a wet snow model to the Münsterland event

AU - Makkonen, Lasse

AU - Wichura, B.

PY - 2009

Y1 - 2009

N2 - A severe wet snow event in the northwest part of Germany (Münsterland area) and in neighbouring regions caused damages of electric power lines and wide-spread outages in November 2005. The paper shortly surveys the event, the damages and the meteorological preconditions. Meteorological conditions (temperature and relative humidity) corresponded to wet snow accretion conditions during almost all the time of the event. Maximum wet-snowloads of approximately 50 N/m occurred. They were estimated by evaluation of the snow density from meteorological data and by analysis of diameter of ice accretion from photographs. The wet snow accretion model of Makkonen (1989) was applied to reconstruct the accretion process in time. The paper shows, that the maximum wet-snow load estimates based on observations are in good agreement with the model results when the snow density is estimated asa function of wind velocity (Poots, 1995) and the model input parameter (visibility) is adjusted by a constant factor of 0.5 for night-time observations, as proposed by Rasmussen et al. (1999).

AB - A severe wet snow event in the northwest part of Germany (Münsterland area) and in neighbouring regions caused damages of electric power lines and wide-spread outages in November 2005. The paper shortly surveys the event, the damages and the meteorological preconditions. Meteorological conditions (temperature and relative humidity) corresponded to wet snow accretion conditions during almost all the time of the event. Maximum wet-snowloads of approximately 50 N/m occurred. They were estimated by evaluation of the snow density from meteorological data and by analysis of diameter of ice accretion from photographs. The wet snow accretion model of Makkonen (1989) was applied to reconstruct the accretion process in time. The paper shows, that the maximum wet-snow load estimates based on observations are in good agreement with the model results when the snow density is estimated asa function of wind velocity (Poots, 1995) and the model input parameter (visibility) is adjusted by a constant factor of 0.5 for night-time observations, as proposed by Rasmussen et al. (1999).

UR - https://www.compusult.com/web/iwais/iwais-2009

M3 - Conference Abstract

ER -

Makkonen L, Wichura B. Application of a wet snow model to the Münsterland event. 2009. Abstract from 13th International Workshop on Atmospheric Icing of Structures, IWAIS 2013, Andermatt, Switzerland.