Articles | Volume 11, issue 11
Nat. Hazards Earth Syst. Sci., 11, 3067–3079, 2011
Nat. Hazards Earth Syst. Sci., 11, 3067–3079, 2011

Review article 21 Nov 2011

Review article | 21 Nov 2011

Optimal rain rate estimation algorithm for light and heavy rain using polarimetric measurements

A. Elmzoughi1, R. Abdelfattah1,2, V. Santalla Del Rio3, and Z. Belhadj1 A. Elmzoughi et al.
  • 1URISA, Higher School of Communication of Tunis, University of Carthage, Tunisia
  • 2Département Image et Traitement de l'Information, Telecom Bretagne, France
  • 3EE de Telecomunicación, Universidad de Vigo, 36211, Vigo, Spain

Abstract. In this paper, we propose an ameliorated physically-based rain rate estimation algorithm for semi-arid regions using the Rayleigh approximation. The proposed algorithm simultaneously uses the reflectivity and the specific differential phase to provide an accurate estimation for both small and large rain rates. In order to validate the proposed estimator, simulated polarimetric rain rate data based on a dual approach, referring to both physical and statistical models of the rain target, are used. Moreover, experimental radar data (the same as used in Matrosov et al., 2006) taken in light to moderate stratiform rainfalls with rain rates varying between 2 and 15 mm h−1 were collected as part of the GPM pilot experiment. It is shown that the proposed algorithm for rain rate estimation based on the full set of polarimetric radar measurements agree better with in situ disdrometer ones.