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B1762
Title: Statistical approaches of the extreme rainfall events variability using hourly data, NW Spain Authors:  Elena Fernandez Iglesias - University of Oviedo (Spain) [presenting]
Gil Gonzalez-Rodriguez - University of Oviedo (Spain)
Jorge Marquinez - University of Oviedo (Spain)
Abstract: Flash floods represent a significant natural hazard in the small mountainous catchments in the NW of Spain. More than 2500 torrents are affected by floods related to short-term storm rainfall. Several studies on rainfall variability have been carried out in Spain. Most of them are focused on the Mediterranean area by using daily data. Little or marginal information is available with hourly data, especially in the Cantabrian area. The aim is to analyze the behavior of these kinds of extreme rainfall events during the last five decades in the Spanish Cantabrian area by using selected hourly precipitation data from six meteorological gauges. By considering large quantiles cutoff, different scenarios of extreme events are handled. The increasing trend of annual series related with the number, duration and total precipitation of these extreme events is statistically analyzed by applying bootstrap tests of isotonicity.