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Titel |
50-year return-period wet-snow load estimation based on weather station data for overhead line design in France |
VerfasserIn |
H. Ducloux, B. E. Nygaard |
Medientyp |
Artikel
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Sprache |
Englisch
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ISSN |
1561-8633
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Digitales Dokument |
URL |
Erschienen |
In: Natural Hazards and Earth System Sciences ; 14, no. 11 ; Nr. 14, no. 11 (2014-11-19), S.3031-3041 |
Datensatznummer |
250118752
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Publikation (Nr.) |
copernicus.org/nhess-14-3031-2014.pdf |
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Zusammenfassung |
Historically, as far as wet-snow loads were concerned, overhead line design
was often based on experience or long-term applications with positive results.
New standard like CENELEC EN 50341-1 (2012) take into account characteristic
loads, i.e. 50-year return-period loads, for the overhead line design. This article proposes a method to estimate characteristic wet-snow
loads based on meteorological data recorded at weather stations. The model
used to calculate those loads is mainly inspired by a recent article written
by Nygaard et al. (2013a) in which a new parameterization is proposed for
the classical cylindrical wet-snow accretion model, as described in ISO 12494 standard (2001), annex C.
After a complete description of the model and its parameterization adapted
to French wet-snow events, the statistical issues are examined. Then, the
model is used with the meteorological data of 87 weather stations in order
to calculate wet-snow loads whose relevance has been positively tested
according to real damages recorded in a complete wet-snow event database.
At last, the characteristic loads of those 87 stations have been determined
according to all the loads generated by the model and processed by a peak-over-threshold (POT) method.
A practical method to determine the 90% confidence intervals of those
characteristic values is given. As it is demonstrated that there is only one
value of the ice class (IC) masses proposed by ISO 12494 in each confidence
interval, characteristic loads can be easily expressed in terms of ICs.
That method shows that ICs ranging from R1 (0.5 kg m−1) to R5
(5 kg m−1) could be used for overhead line design in France. |
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