A Bayesian beta distribution model for estimating rainfall IDF curves in a changing climate

•Estimation of IDF curves for rainfall data comprises a classical task in hydrology.•Stationary assumption can be inadequate and lead to poor quantile estimates.•We model annual maximum series conditioned on the daily rainfall.•The Bayesian beta model is used to produce nonstationary IDF curves for...

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Veröffentlicht in:Journal of hydrology (Amsterdam) 2016-09, Vol.540, p.744-756
Hauptverfasser: Lima, Carlos H.R., Kwon, Hyun-Han, Kim, Jin-Young
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Kwon, Hyun-Han
Kim, Jin-Young
description •Estimation of IDF curves for rainfall data comprises a classical task in hydrology.•Stationary assumption can be inadequate and lead to poor quantile estimates.•We model annual maximum series conditioned on the daily rainfall.•The Bayesian beta model is used to produce nonstationary IDF curves for Korea.•Model provides future climate IDF curves based on climate change scenarios. The estimation of intensity-duration-frequency (IDF) curves for rainfall data comprises a classical task in hydrology studies to support a variety of water resources projects, including urban drainage and the design of flood control structures. In a changing climate, however, traditional approaches based on historical records of rainfall and on the stationary assumption can be inadequate and lead to poor estimates of rainfall intensity quantiles. Climate change scenarios built on General Circulation Models offer a way to access and estimate future changes in spatial and temporal rainfall patterns at the daily scale at the utmost, which is not as fine temporal resolution as required (e.g. hours) to directly estimate IDF curves. In this paper we propose a novel methodology based on a four-parameter beta distribution to estimate IDF curves conditioned on the observed (or simulated) daily rainfall, which becomes the time-varying upper bound of the updated nonstationary beta distribution. The inference is conducted in a Bayesian framework that provides a better way to take into account the uncertainty in the model parameters when building the IDF curves. The proposed model is tested using rainfall data from four stations located in South Korea and projected climate change Representative Concentration Pathways (RCPs) scenarios 6 and 8.5 from the Met Office Hadley Centre HadGEM3-RA model. The results show that the developed model fits the historical data as good as the traditional Generalized Extreme Value (GEV) distribution but is able to produce future IDF curves that significantly differ from the historically based IDF curves. The proposed model predicts for the stations and RCPs scenarios analysed in this work an increase in the intensity of extreme rainfalls of short duration with long return periods.
doi_str_mv 10.1016/j.jhydrol.2016.06.062
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The estimation of intensity-duration-frequency (IDF) curves for rainfall data comprises a classical task in hydrology studies to support a variety of water resources projects, including urban drainage and the design of flood control structures. In a changing climate, however, traditional approaches based on historical records of rainfall and on the stationary assumption can be inadequate and lead to poor estimates of rainfall intensity quantiles. Climate change scenarios built on General Circulation Models offer a way to access and estimate future changes in spatial and temporal rainfall patterns at the daily scale at the utmost, which is not as fine temporal resolution as required (e.g. hours) to directly estimate IDF curves. In this paper we propose a novel methodology based on a four-parameter beta distribution to estimate IDF curves conditioned on the observed (or simulated) daily rainfall, which becomes the time-varying upper bound of the updated nonstationary beta distribution. The inference is conducted in a Bayesian framework that provides a better way to take into account the uncertainty in the model parameters when building the IDF curves. The proposed model is tested using rainfall data from four stations located in South Korea and projected climate change Representative Concentration Pathways (RCPs) scenarios 6 and 8.5 from the Met Office Hadley Centre HadGEM3-RA model. The results show that the developed model fits the historical data as good as the traditional Generalized Extreme Value (GEV) distribution but is able to produce future IDF curves that significantly differ from the historically based IDF curves. 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subjects Bayesian
Bayesian analysis
Beta distribution
Climate change
Estimates
Hydrology
Intensity-duration-frequency curves
Mathematical models
Nonstationarity
Probability distribution functions
Rainfall
Stations
title A Bayesian beta distribution model for estimating rainfall IDF curves in a changing climate
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