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Using a hidden Markov model to analyse extreme rainfall events in Central-East Sardinia

Betrò, Bruno and Bodini, Antonella and Cossu, Quirico Antonio (2008) Using a hidden Markov model to analyse extreme rainfall events in Central-East Sardinia. Environmetrics, Vol. 19 (7), p. 702-713. eISSN 1099-095X. Article.

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DOI: 10.1002/env.944

Abstract

The aim of this paper is to investigate the capability of a hidden Markov model (HMM) in identifying possible recurrent patterns in the occurrence of extreme events over a small area of Central-East Sardinia (Italy), for the purposes of hydrogeological risk prevention. In this area, three intense rainfall events (defined as more than 40 mm in a day) per year are expected during the period September-January. They often assume the characteristics of an extreme event, here defined as more than 100 mm of precipitation in a day. The main interest of modelling daily rainfall data by a HMM lies in the underlying correspondence between the hidden states and the concept of discrete weather states. To model the precipitation at each station, given the weather state, we suggest using a mixture of a point mass at zero and of Weibull distributions, these latter showing a better fit to the considered data than the more usual Gamma and Exponential distributions.

Item Type:Article
ID Code:1880
Status:Published
Refereed:Yes
Uncontrolled Keywords:Extreme events, hidden Markov models, mixtures, Weibull distribution, Sardinia
Subjects:Area 04 - Scienze della terra > GEO/05 Geologia applicata
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > SAR-Servizio Agrometereologico Regionale per la Sardegna, Sassari
Publisher:Wiley
eISSN:1099-095X
Deposited On:18 Aug 2009 10:06

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