Ability of a dual polarized X-band radar to estimate rainfall |
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| Authors: | S Diss J Testud J Lavabre P Ribstein E Moreau J Parent du Chatelet |
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| Institution: | 1. Cemagref, Aix en Provence-Equipe Hydrologie Division OHAX 3275 Route Cézanne - CS 40061 13182 AIX EN PROVENCE Cedex 5, France;2. Novimet, 10-12, avenue de l’Europe, 78140 VELIZY, France;3. Université P. & M. Curie (Paris VI), UMR 7619 Sisyphe, 4 place Jussieu, Tour 56, Couloir 46-56, 3° étage, 75252 PARIS Cedex 05, France;4. Météo France, DSO, Centre de Météorologie Radar, Trappes, France |
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| Abstract: | The aim of this study is to assess rainfall estimates by a dual polarized X-band radar. This study was part of the European project FRAMEA (Flood forecasting using Radar in Alpine and Mediterranean Areas). Two radars were set up near the small town of Collobrières in South Eastern France. The first radar was a dual polarized X-band radar (Hydrix®) associated with a ZPHI® algorithm while the second one was an S-band radar (Météo France). We compared radar rainfall data with measurements obtained by two rain gauge networks (Météo France and Cemagref). During the experiments from February 2006 to June 2007, four significant rainfall events occurred. The accuracy of the rain rate obtained with both S-band and X-band radars decreased significantly beyond 60 km, in particular for the X-band radar. At closer ranges, such as 30–60 km from the radars, the X-band and the S-band radar retrievals showed similar performance with Nash criteria around 0.80 for the X-band radar and 0.75 for the S-band radar. Furthermore, the X-band radar did not require calibration on rainfall records, which tends to make it a useful method to assess rainfall in areas without a rain gauge network. |
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| Keywords: | Quantitative precipitation estimation X-band weather radar Rainfall |
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