Statistical distribution of the fractional area affected by rain - ONERA - Office national d'études et de recherches aérospatiales Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research: Atmospheres Année : 2008

Statistical distribution of the fractional area affected by rain

Résumé

The knowledge of the fraction of an area that is affected by rain (or fractional area) is of prime interest for hydrologic studies or for rainfall field modeling. Up to now, the statistical distribution of this parameter has been poorly studied. In the present paper, a model of the statistical distribution of the fraction of an area affected by rain over a given rainfall rate is proposed. It takes into account at the same time the size of the area and the local climatology. The analytic formulation of the distribution is established, considering that rainfall fields can be obtained from a nonlinear filtering of a Gaussian random field. As the analytic derivation of the distribution lies on some assumptions, the model accuracy is first evaluated from numerical simulations. It is then shown that the model reproduces accurately the distribution of fractional areas derived from radar observations of rain fields for various rain thresholds, sizes of area, and climatologies. A generic parameterization is then proposed for areas ranging from 100 × 100 to 300 × 300 km2.
Fichier principal
Vignette du fichier
Journal of Geophysical Research Atmospheres - 2008 - Jeannin - Statistical distribution of the fractional area affected by.pdf (533.8 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-00564815 , version 1 (16-06-2022)

Licence

Copyright (Tous droits réservés)

Identifiants

Citer

N. Jeannin, L. Féral, Henri Sauvageot, L. Castanet, J. Lemorton. Statistical distribution of the fractional area affected by rain. Journal of Geophysical Research: Atmospheres, 2008, 113, pp.D21120. ⟨10.1029/2008JD009780⟩. ⟨hal-00564815⟩
82 Consultations
11 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More