Sanchez-Diezma, R. (Universitat Politecnica de Catalunya, Dpt. d'Enginyeria Hidraulica Maritima i Ambiental)
Sempere-Torres, Daniel (same affiliation)
Weather Radar indirectly estimates rain intensities (R) by means of reflectivity (Z), but if required to setup convenient relations between R and Z. In this case climatological methods are one of the most atractive to match these relations. In general terms this methods look for a statistical R-Z relation matching Ri-Zi pairs of the probability distributions of R and Z which have the same probability of occurrence. This approach have the advantage that these distributions can be obtained from from concurrent in time and space data or from historical radar and raingauge data when synchronous pairs are not available. A case of study is presented applying this methodology to a Mediterranean region using a long hourly rainfall-rate data set and one year hourly rainfall rate field measured by radar. Finally the obtained R-Z relation is tested comparing synchronic values of hourly rainfall rate from radar (corrected by the R-Z relation) and hourly rainfall rate from a gauge network.