Title:
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Return period curves for extreme 5-min rainfall amounts at the Barcelona urban network
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Author:
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Lana Pons, Francisco Javier; Casas Castillo, M. del Carmen; Serra de Larrocha, Carina; Rodríguez Solá, Raúl; Redaño Xipell, Angel; Burgueño Rivero, August; Martínez Santafé, Maria Dolors
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Física; Universitat Politècnica de Catalunya. GIES - Geofísica i Enginyeria Sísmica |
Abstract:
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Heavy rainfall episodes are relatively common in the conurbation of Barcelona and neighbouring cities (NE Spain), usually due to storms generated by convective phenomena in summer and eastern and south-eastern advections in autumn. Prevention of local flood episodes and right design of urban drainage have to take into account the rainfall intensity spread instead of a simple evaluation of daily rainfall amounts. The database comes from 5-min rain amounts recorded by tipping buckets in the Barcelona urban network along the years 1994–2009. From these data, extreme 5-min rain amounts are selected applying the peaks-over-threshold method for thresholds derived from both 95% percentile and the mean excess plot. The return period curves are derived from their statistical distribution for every gauge, describing with detail expected extreme 5-min rain amounts across the urban network. These curves are compared with those derived from annual extreme time series. In this way, areas in Barcelona submitted to different levels of flood risk from the point of view of rainfall intensity are detected. Additionally, global time trends on extreme 5-min rain amounts are quantified for the whole network and found as not statistically significant. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Física::Impacte ambiental -Àrees temàtiques de la UPC::Desenvolupament humà i sostenible -Precipitation (Meteorology)--Measurement -Urban hydrology -Extreme 5-min rain amounts -Peaks-over-threshold -Mean excess plot -Annual extreme time series -Return periods -GP GLO and GEV distributions -Significant time trends -Barcelona urban network -Precipitacions (Meteorologia)--Mesurament -Hidrologia urbana |
Rights:
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Document type:
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Article - Submitted version Article |
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