Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Return Levels"”.
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Air quality applications of extreme value theory : return levels of extreme ozone events in Chicago and surrounding areas
… are applied to calculate and compare 20-year return levels at 5 urban and 17 rural/suburban sites in Illinois based upon maximum daily 8-. hour average ozone concentrations from summer (JJA) for two periods (1992- 2002 and 2003-2013) and a threshold of 70 (ppb). Between the two periods, 21 out …
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UNCERTAINTY QUANTIFICATION IN DOWNSCALING OF PRECIPITATION EXTREMES AND ITS APPLICATION TO NEW ENGLAND
… of long-term extreme events such as 25-year return levels. Two major sources of downscaling uncertainty were addressed: uncertainty arising from parametric distribution modeling for precipitation extremes and uncertainty due to the particular predictive model employed for estimation of their …
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Extreme sea levels in the English Channel 1900 to 2006
… of enhanced coastal flooding due to rising sea levels and climate change. Hence, it is of utmost practical importance that probabilities of current and future extreme sea level are accurately evaluated so that the changing flood risk can be assessed and defences upgraded where appropriate. This …
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Extreme Value Analysis of Rainfall Events Over the Kennedy Space Center Complex
… change. Extreme-value theory can quantify the return frequency of the most extreme events, using climatologically short data sets and the assumption that such short climatological periods are stationary. However, the resulting analyses must be used with caution since they may not accurately …
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Extreme Value Analysis of Rainfall Events Over the Kennedy Space Center Complex
… change. Extreme-value theory can quantify the return frequency of the most extreme events, using climatologically short data sets and the assumption that such short climatological periods are stationary. However, the resulting analyses must be used with caution since they may not accurately …
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Variability and long-term trends of climate extremes over the Limpopo, South Africa
… data was chosen, the interest was in deriving return levels of extreme maximum rainfall. The computed data for return levels predicted that the 5-year return period’s return level is approximately 223.89 mm, which suggests that rainfall of 223.89 mm or more per month should occur at that …
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Extreme value theory: Applications to estimation of stochastic traffic capacity and statistical downscaling of precipitation extremes
… of extreme precipitation local-level 25-year return levels are calculated. To obtain uncertainty estimates for future return levels, both a parametric bootstrap and Bayesian procedure are implemented. The Bayesian method consists of a semi-parametric mixture model for daily precipitation where …
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MODELLING DRY AND WET EXTREMES OVER THE CANADIAN PRAIRIE PROVINCES BASED ON THE DYNAMICAL DOWNSCALING AND MULTIVARIATE FREQUENCY ANALYSIS APPROACHES
… the entire study area and changes to various return levels of drought severity, duration and maximum severity were developed based on NARCCAP RCM simulations and multivariate frequency analysis approaches. It was found that the southern and south-western parts of the study area will experience …
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Understanding Coastal and Inland Hydrometeorological Hazards Produced by Extratropical and Tropical Cyclones along the East Coast of the United States
… of TCs resulted in surge exceeding the 1-year return level at each site. If only the closest and strongest TCs are considered, the percentage of TCs that generate surge exceeding the 1-year return level is between 30% and 70% at sites north of Sewell’s Point, VA, and over 65% at almost all …
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Statistical models for dependent and non-stationary extreme events
… may be used for modelling wave heights and river levels in hydrology, wind speeds in structural engineering and share price return levels in economics. Many statistical models and methods of inference exist for the extreme values of univariate sequences of independent and identically distributed …
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Modelling flood heights of the Limpopo River at Beitbridge Border Post using extreme value distributions
… and quantile- quantile plots are used. Finally return levels are calculated from these distributions. The dissertation has revealed that the 100 year return level is 6.759 metres using the maximum likelihood and Bayesian approaches to estimate parameters. Empirical results show that the Fr echet …
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Statistical analysis of bathing water quality in Scotland
… and threshold models to identify suitable return levels which could be applied as discounting limits across all sites. The differences between the return level limits obtained from each of the models, their impact on the levels of compliance classification when all counts exceeding the …
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Reliability based live loads for structural assessment of bridges on heavy-haul railway lines
… loads effects are less sensitive to increase in return period beyond 50 years. This aspect is significant as return period is a measure of safety target when determining design values for loads. The study investigated the impact of traffic volume increase and wagon axle load dependencies. The …