Distribución espacial del riesgo de precipitaciones extremas en el Pirineo Aragonés Occidental

Abstract

Extreme rainfall events are very unusual and tend to provoke high magnitude geomorphic processes, with catastrophic economic and human consequences. The hazard is even higher in mountain areas, with huge topographic gradients and high geomorphic instability These extreme events occur with a low frequency and an apparently erratic spatial distribution. This is the reason why the current pluviometric records are inadequate or insufficient for studying the spatial and temporal organisation of the most intense rainstorms. In this paper the spatial distribution of the extreme rainfalls in the Central Spanish Pyrenees has been assessed. A map of extreme precipitation hazard with uncertainty,using statistical techniques and GIS, is proposed. A critical analysis of the statistical methods used in the study of extreme rainfall events is done. Such methods need a study of the statistical significance in order to test their reliability