Statistical Analysis Of Extreme Wind Speeds
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Statistical Analysis Of Extreme Winds
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Author : Emil Simiu
language : en
Publisher:
Release Date : 1975
Statistical Analysis Of Extreme Winds written by Emil Simiu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Wind-pressure categories.
Statistical Analysis Of Extreme Wind Speeds
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Author : David Walshaw
language : en
Publisher:
Release Date : 1991
Statistical Analysis Of Extreme Wind Speeds written by David Walshaw and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
Statistical Analysis Of Extreme Winds
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Author : Emil Simiu
language : en
Publisher:
Release Date : 1975
Statistical Analysis Of Extreme Winds written by Emil Simiu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Wind-pressure categories.
Spatial Variation And Interpolation Of Wind Speed Statistics And Its Implication In Design Wind Load
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Author : Wei Ye
language : en
Publisher:
Release Date : 2013
Spatial Variation And Interpolation Of Wind Speed Statistics And Its Implication In Design Wind Load written by Wei Ye and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Consideration of wind load is important for design of engineered structures. Codification of wind load for structural design requires the estimation of the quantiles or return period values of the annual maximum wind speed. The extreme wind speeds are estimated based on the measured wind records at different meteorological stations and affected by the length of the wind record (i.e., sample size) and other factors such as the surrounding terrain and so on. This study is focused on 1) the spatial interpolation of wind speed statistics, 2) the potential of using regional frequency analysis in estimating the extreme wind speed, and 3) the reliability of designed structure at sites with and without sample size effects. For the spatial interpolation, both code recommended values of the wind speed as well as those based on at-site analysis are used, and commonly used spatial interpolation methods including 8 deterministic methods and 6 geostatistical methods have been applied. The preferred methods for each data set are determined based on the (leave-one-out) cross validation analyses. It is shown that the preferred method depends on the considered data set; the use of the ordinary kriging is preferred if a single method is to be selected for all considered data sets. The historical wind records and available meteorological stations are often short and insufficient or unavailable, and the limited sample size will cause the uncertainty in the estimated quantiles. To deal with the data insufficiency in the wind speed records at the meteorological stations, the regional frequency analysis was applied to the data from the same 235 Canadian meteorological stations as mentioned above to calculate the quantiles of the annual maximum wind speed for iii Canada. The obtained estimates of the quantiles of the extreme wind speed based on the regional frequency analysis are compared with those obtained based directly on the at-site analysis. The analysis uses the k-means, hierarchical and self-organizing map clustering to explore potential clusters or regions; statistical tests are then applied to identify homogeneous regions for subsequent regional frequency analysis. Results indicate that the k-means is the preferred exploratory tool for the considered data and the generalized extreme value distribution provides a better fit to the data than the Gumbel distribution for regional frequency analysis. However, the former is associated with low values of the upper bound that do not influence the estimation of 10-to 50-year return period values of annual maximum wind speed but do influence the return period values with return period greater than 500 years. Based on these observations, regional frequency analysis may not be needed as an alternative to the at-site analysis. Furthermore, since the estimated quantiles of the extreme wind speed at a site are uncertain due to the limited sample size, the effect of this statistical uncertainty on the estimated return period value of the wind speed and structural reliability is investigated and two strategies (i .e. (i) a low return period for the nominal wind speed combined with a wind load factor greater than one and (ii) a high return period for the nominal wind speed combined with unity wind load factor) for specifying the factored design wind load are also evaluated to determine the optimal one. Results indicate that at least 20 years of useable data are needed for a station to be included in the extreme value analysis, and the first strategy is preferred to cope with sample size effect for the design at a particular site or in a region with statistically homogeneous wind climate, while the second strategy is recommended for the code making for a country with spatially varying coefficient of variation of annual maximum wind speed since it leads to better reliab ility consistency.
Statistical Analysis Of Extreme Winds
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Author : Emil Simiu
language : en
Publisher:
Release Date : 1975
Statistical Analysis Of Extreme Winds written by Emil Simiu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Winds categories.
Statistical Analysis Of Extreme Winds With List Of References
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Author :
language : en
Publisher:
Release Date : 1975
Statistical Analysis Of Extreme Winds With List Of References written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with categories.
Building To Resist The Effect Of Wind
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Author : United States. National Bureau of Standards
language : en
Publisher:
Release Date : 1977
Building To Resist The Effect Of Wind written by United States. National Bureau of Standards and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Buildings categories.
Australian Extreme Windspeed Baseline Climate Investigation Project
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Author : Robert P. Cechet
language : en
Publisher:
Release Date : 2011
Australian Extreme Windspeed Baseline Climate Investigation Project written by Robert P. Cechet and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Winds categories.
"This study has examined the observed record of peak gust wind speed (daily maximum 3-second averaged gust wind speed) in order to establish the existence of bias between the early part of the record (measurements obtained using pressure-tube Dines anemometers) and the later part of the record (measurements obtained using cup anemometers). All observational data as well as metadata was obtained from the Bureau of Meteorology ... Statistical analysis of the daily maximum gust wind speed observations was conducted by employing extreme value distributions (EVD) to examine the difference between two datasets: 1) time-series of Dines & anemometer observations ... 2) coincident Dines & cup anemometer observations."--Executive summary.
The Analysis Of Extreme Synoptic Winds
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Author : David Allan Gatey
language : en
Publisher:
Release Date : 2011
The Analysis Of Extreme Synoptic Winds written by David Allan Gatey and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Time histories of wind speed and direction from 394 surface observation stations were obtained to calculate synoptic 50-year return period wind speeds for 11 countries in Europe. Preliminary investigation indicated wind speed differences along national borders were successfully reduced by application of a simple consistent methodology to wind speed data. This study considers the ideal methodology for calculating synoptic 50-year return period wind speeds. Wind speed data requires standardisation through quality control measures, exposure correction and adjustment for disjunct sampling. A quality control algorithm was successfully applied to identify shifts of monthly mean wind speeds and data conversion issues. Three exposure correction models were evaluated and two-layer models were found to perform better than internal boundary layer models. The differences arise as a result of how the models adapt to an upstream change of roughness. Furthermore, an empirical model was formed to correct observations at stations which were not recording measurements hourly. Extreme value analyses were carried out using a robust estimator to fit the extreme value distribution type I to storm and yearly maxima. The latter was found to provide more consistent results. Comparison of the resulting 50-year return period wind speeds to existing literature found that several regions were in good agreement, while other regions exhibited similar spatial variation but greater magnitudes. The differences in magnitude were partially related to exposure correction methods, thus lending support to the importance of a single consistent methodology. Directional factors were calculated and subsequently grouped into six regions exhibiting similar directional characteristics. Background wind fields were calculated from mean sea-level pressure data using the geostrophic approximation and consideration of other improved approximations, however, variations in the pressure field led to a breakdown of the methodology. A background 50-year return period wind field calculated from upper-level wind fields was significantly lower than surface wind speed estimates due to spatial and temporal smoothing. Finally, assimilation of the 50-year return period wind speeds from surface observations and the background wind field was explored using the Bratseth scheme for statistical interpolation. The Bratseth scheme provided an overall 50-year return period wind speed map.
Extreme Wind Speeds Gustiness And Variations With Height For Mil Std 210b
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Author : Norman Sissenwine
language : en
Publisher:
Release Date : 1973
Extreme Wind Speeds Gustiness And Variations With Height For Mil Std 210b written by Norman Sissenwine and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Climatology categories.
MIL-STD-210A, 'Climatic Extremes for Military Equipment', is being revised. The revision will include two sets of windspeed design goals for military equipment being developed for worldwide usage over land: (1) the speed up to which 'operations' are expected to proceed, (2) the speed that equipment should 'withstand' without irreversible damage. A study of gustiness and variations of wind with height during strong wind regimes is presented. Nomograms of gust factor versus gust duration and steady windspeed are used to assign the most dynamically effective gust according to equipment dimensions. Based on a power-law relationship, factors for adjusting windspeed to a common height to describe windspeed and gusts over the vertical extent of military equipment usage are presented. Also included is a tabulation of wind statistics for selected stations considered in the search for worldwide wind extremes.