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Title: Effect of radar rainfall time resolution on the predictive capability of a distributed hydrologic model
Author: Atencia, A.
Mediero, L.
Llasat Botija, María del Carmen
Garrote, L.
Keywords: Radar
Precipitacions (Meteorologia)
Previsió del temps
Precipitations (Meteorology)
Weather forecasting
Issue Date: 2011
Publisher: European Geosciences Union (EGU)
Abstract: The performance of a hydrologic model depends on the rainfall input data, both spatially and temporally. As the spatial distribution of rainfall exerts a great influence on both runoff volumes and peak flows, the use of a distributed hydrologic model can improve the results in the case of convective rainfall in a basin where the storm area is smaller than the basin area. The aim of this study was to perform a sensitivity analysis of the rainfall time resolution on the results of a distributed hydrologic model in a flash-flood prone basin. Within such a catchment, floods are produced by heavy rainfall events with a large convective component. A second objective of the current paper is the proposal of a methodology that improves the radar rainfall estimation at a higher spatial and temporal resolution. Composite radar data from a network of three C-band radars with 6-min temporal and 2 × 2 km2 spatial resolution were used to feed the RIBS distributed hydrological model. A modification of the Window Probability Matching Method (gauge-adjustment method) was applied to four cases of heavy rainfall to improve the observed rainfall sub-estimation by computing new Z/R relationships for both convective and stratiform reflectivities. An advection correction technique based on the cross-correlation between two consecutive images was introduced to obtain several time resolutions from 1 min to 30 min. The RIBS hydrologic model was calibrated using a probabilistic approach based on a multiobjective methodology for each time resolution. A sensitivity analysis of rainfall time resolution was conducted to find the resolution that best represents the hydrological basin behaviour.
Note: Reproducció del document publicat a:
It is part of: Hydrology and Earth System Sciences, 2011, vol. 15, p. 3809-3827
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ISSN: 1027-5606
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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