Please use this identifier to cite or link to this item:
Title: Characteristics of 2D convective structures in Catalonia (NE Spain): an analysis using radar data and GIS
Author: Barnolas, M.
Rigo, Tomeu
Llasat Botija, María del Carmen
Keywords: Hidrologia
Precipitacions (Meteorologia)
Sistemes d'informació geogràfica
Precipitations (Meteorology)
Geographic information systems
Issue Date: 2010
Publisher: European Geosciences Union (EGU)
Abstract: Flood simulation studies use spatial-temporal rainfall data input into distributed hydrological models. A correct description of rainfall in space and in time contributes to improvements on hydrological modelling and design. This work is focused on the analysis of 2-D convective structures (rain cells), whose contribution is especially significant in most flood events. The objective of this paper is to provide statistical descriptors and distribution functions for convective structure characteristics of precipitation systems producing floods in Catalonia (NE Spain). To achieve this purpose heavy rainfall events recorded between 1996 and 2000 have been analysed. By means of weather radar, and applying 2-D radar algorithms a distinction between convective and stratiform precipitation is made. These data are introduced and analyzed with a GIS. In a first step different groups of connected pixels with convective precipitation are identified. Only convective structures with an area greater than 32 km2 are selected. Then, geometric characteristics (area, perimeter, orientation and dimensions of the ellipse), and rainfall statistics (maximum, mean, minimum, range, standard deviation, and sum) of these structures are obtained and stored in a database. Finally, descriptive statistics for selected characteristics are calculated and statistical distributions are fitted to the observed frequency distributions. Statistical analyses reveal that the Generalized Pareto distribution for the area and the Generalized Extreme Value distribution for the perimeter, dimensions, orientation and mean areal precipitation are the statistical distributions that best fit the observed ones of these parameters. The statistical descriptors and the probability distribution functions obtained are of direct use as an input in spatial rainfall generators.
Note: Reproducció del document publicat a:
It is part of: Hydrology and Earth System Sciences, 2010, vol. 14, p. 129-139
Related resource:
ISSN: 1027-5606
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

Files in This Item:
File Description SizeFormat 
596961.pdf1.64 MBAdobe PDFView/Open

This item is licensed under a Creative Commons License Creative Commons