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Title: | Effect of radar rainfall time resolution on the predictive capability of a distributed hydrologic model |
Author: | Atencia, Aitor Mediero, Luis Llasat Botija, María del Carmen Garrote, Luis |
Keywords: | Radar Precipitacions (Meteorologia) Hidrologia Inundacions Previsió del temps Catalunya Radar Precipitations (Meteorology) Hydrology Floods Weather forecasting Catalonia |
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: http://dx.doi.org/10.5194/hess-15-3809-2011 |
It is part of: | Hydrology and Earth System Sciences, 2011, vol. 15, p. 3809-3827 |
URI: | http://hdl.handle.net/2445/45667 |
Related resource: | http://dx.doi.org/10.5194/hess-15-3809-2011 |
ISSN: | 1027-5606 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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