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ESTIMATION QUANTITATIVE DES PRECIPITATIONS PAR RADAR METEOROLOGIQUE : INFERENCE DE LA STRUCTURE VERTICALE DES PLUIES, MODELISATION DES ERREURS RADAR-PLUVIOMETRES.

Abstract : THE CÉVENNES-VIVARAIS MEDITERRANEAN HYDROMETEOROLOGICAL OBSERVATORY IS A RESEARCH INITIATIVE AIMED AT IMPROVING THE RAINFALL OBSERVATION. A NUMBER OF INNOVATIVE QUANTITATIVE PRECIPITATION ESTIMATION (QPE) ALGORITHMS AIMED AT A SPACE-TIME ADAPTIVE RADAR DATA PROCESSING WERE DEVELOPED USING THE DATASET OF THE BOLLÈNE 2002 EXPERIMENT. THE LAST INVOLVED THE OPERATIONAL WEATHER RADAR OF BOLLÈNE, WHICH IS PART OF THE ARAMIS NETWORK.
OUR CONTRIBUTION IN THE PRESENT THESIS DEALS WITH THE VERTICAL HETEROGENEITY OF RAINFALL. WE CONSIDER THE VERTICAL PROFILE OF REFLECTIVITY INVERSION METHOD PROPOSED BY ANDRIEU ET CREUTIN (1995). IT IS ADAPTED TO THE CASE OF TIME-VARYING GEOGRAPHICAL SUPPORTS DESIGNED WITH PRELIMINARY RAIN TYPING.
CHARACTERIZING THE ERROR STRUCTURE OF RADAR QUANTITATIVE PRECIPITATION ESTIMATES IS RECOGNIZED AS A MAJOR ISSUE. WE ASSESS THE RADAR QPE WITH RESPECT TO REFERENCE RAIN ESTIMATES DERIVED FROM RAIN GAUGE NETWORKS. A GEOSTATISTICAL FRAMEWORK IS PROPOSED FOR THE ESTABLISHMENT OF SUCH REFERENCE ESTIMATES. ASSUMING THE RESIDUAL BETWEEN RADAR AND REFERENCE VALUE TO BE A RANDOM VARIABLE, WE DESCRIBE RADAR ERROR BY MEAN OF PROBABILITY DISTRIBUTIONS. THE MODEL CONSISTS IN AN ADDITIVE RANDOM ERROR, DESCRIBED BY A RANDOM DISTRIBUTION. SOME ELEMENTS OF SPACE-TIME ERROR STRUCTURE ARE GIVEN.
A NEW APPROACH TO DETERMINE THE VERTICAL PROFILE OF REFLECTIVITY (VPR) IS PROPOSED. IT IS BASED ON A SIMPLIFIED MICROPHYSICS IN SYNERGY WITH RADAR OBSERVATIONS TO SIMULATE THE VPR. A VPR IS DESCRIBED WITH A REDUCED NUMBER OF PHYSICAL PARAMETERS. THE NEW IDENTIFIED VPRS ARE THUS LESS REFINED BUT MORE VALID AND ROBUST THAN THE INITIAL METHOD.
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https://tel.archives-ouvertes.fr/tel-00355957
Contributor : Pierre-Emmanuel Kirstetter <>
Submitted on : Monday, January 26, 2009 - 12:18:41 PM
Last modification on : Thursday, November 19, 2020 - 3:54:29 PM
Long-term archiving on: : Tuesday, June 8, 2010 - 6:01:30 PM

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  • HAL Id : tel-00355957, version 1

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P.E. Kirstetter. ESTIMATION QUANTITATIVE DES PRECIPITATIONS PAR RADAR METEOROLOGIQUE : INFERENCE DE LA STRUCTURE VERTICALE DES PLUIES, MODELISATION DES ERREURS RADAR-PLUVIOMETRES.. Physique [physics]. Université Joseph-Fourier - Grenoble I, 2008. Français. ⟨tel-00355957⟩

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