Authors / CoAuthors
Cechet, P.R. | Sanabria, L.A.
Abstract
The Australia/New Zealand wind actions standard (AS/NZS 1170.2 2011), rely to a significant extent on the peak gust wind speed observations collected over more than 70 years by the Australian Bureau of Meteorology (BoM). The Building Code of Australia (BCA) utilises AS/NZS 1170.2 to minimise natural hazard risk to people and buildings. The current wind loading code, and the performance of our infrastructure (residential, commercial, industrial and critical infrastructure) with regards to wind hazard, is based primarily on the Dines anemometer interpretation of the peak gust wind speed (commenced in the 1930's). In the mid-1980's, BoM began a program to replace the aging pressure tube Dines anemometer (paper record) with the Synchrotac and Almos digital cup anemometers. During the anemometer replacement process, many localities had more than one type of anemometer operating for significant periods. recording extreme events. Systematic differences in determining the magnitude of extreme events during this overlap period, raised serious concerns about the utility of the peak gust wind speed database. This study utilises statistical extreme value distribution analysis (Generalised Pareto Distribution; GPD) examining coincident maximum wind gusts over a fixed 30 minute time window. The analysis estimated of the 500-year return-period (RP) peak gust wind exceedance level derived from the coincident Dines and cup anemometer wind gust measurements. The extreme gust wind speeds for seven sites (coincident measurement period of 89 years) were considered, indicating a bias between the Dines and cup anemometers from +7% to +14% over the speed range from 45 to 60 m/s.
Product Type
nonGeographicDataset
eCat Id
73707
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Custodian
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- External Publication
- ( Theme )
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- climate
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2012-01-01T00:00:00
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geoscientificInformation
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