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| Title: | Effect of radar rainfall time resolution on the predictive capability of a distributed hydrologic model |
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| Author: | Atencia, A.; Mediero, L.; Llasat Botija, María del Carmen; Garrote, L. |
| Other authors: | Universitat de Barcelona |
| 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. |
| Subject(s): | -Radar -Precipitacions (Meteorologia) -Hidrologia -Inundacions -Previsió del temps -Catalunya -Radar -Precipitations (Meteorology) -Hydrology -Floods -Weather forecasting -Catalonia |
| Rights: | cc-by (c) Atencia, A. et al., 2011
http://creativecommons.org/licenses/by/3.0/es |
| Document type: | Article Article - Published version |
| Published by: | European Geosciences Union (EGU) |
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