Technique for estimating rainfall from a meteorological...

G - Physics – 01 – S

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G01S 13/95 (2006.01)

Patent

CA 2318455

The invention concerns a method for estimating rainfall rate using a bipolar radar, characterised in that it comprises the following steps: measuring by means of said bipolar radar, over a given interval [r1, r0] with travel radius r relative to said radar, the differential phase PHI dp and the attenuated reflectivity Z along at least one polarisation H or V; determining an estimation of the value of K(r0) of the attenuation in r0 from the measured attenuated reflectivity profile, as well as from the differential phase between r0 and r1; determining an estimation K(r) of the specific attenuation in r on the basis of the attenuation K(r0) thus determined and of the attenuated reflectivity profile Z(r); determining the rainfall rate R(r) with K(r) known.

Procédé pour l'estimation d'un taux précipitant au moyen d'un radar bipolaire, caractérisé par les différentes étapes suivantes: on mesure au moyen dudit radar bipolaire, sur un intervalle [r1, r0] donné de rayon r de trajet par rapport audit radar, la phase différentielle .PHI.dp et la réflectivité atténuée Z selon au moins l'une des polarisations H ou V; on détermine une estimation de la valeur K(r0) de l'atténuation en r0 à partir du profil de réflectivité atténuée ainsi mesuré, ainsi qu'à partir de la différence de la phase différentielle entre r0 et r1; on détermine une estimation K(r) de l'atténuation spécifique en r en fonction de l'atténuation K(r0) ainsi déterminée et du profil de réflectivité atténuée Z(r); on détermine le taux de précipitant R(r) connaissant K(r).

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