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Bayesian Spatial Modeling of Extreme Precipitation Return Levels
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Journal Article
Bayesian Spatial Modeling of Extreme Precipitation Return Levels
2007
Overview
Quantification of precipitation extremes is important for flood planning purposes, and a common measure of extreme events is the r-year return level. We present a method for producing maps of precipitation return levels and uncertainty measures and apply it to a region in Colorado. Separate hierarchical models are constructed for the intensity and the frequency of extreme precipitation events. For intensity, we model daily precipitation above a high threshold at 56 weather stations with the generalized Pareto distribution. For frequency, we model the number of exceedances at the stations as binomial random variables. Both models assume that the regional extreme precipitation is driven by a latent spatial process characterized by geographical and climatological covariates. Effects not fully described by the covariates are captured by spatial structure in the hierarchies. Spatial methods were improved by working in a space with climatological coordinates. Inference is provided by a Markov chain Monte Carlo algorithm and spatial interpolation method, which provide a natural method for estimating uncertainty.
Publisher
Taylor & Francis,American Statistical Association,Taylor & Francis Ltd
Subject
/ Applications and Case Studies
/ Colorado
/ Continental interfaces, environment
/ Exact sciences and technology
/ Extremes
/ Generalized Pareto distribution
/ Inference from stochastic processes; time series analysis
/ Modeling
/ Probability theory and stochastic processes
/ Regions
/ Sciences and techniques of general use
/ U.S.A
/ Weather
