Estimation of rain kinetic energy flux density from radar reflectivity and/or rain rate

N. Yu, B. Boudevillain, P. Hazenberg, R. Uijlenhoet

Research output: Chapter in Book/Report/Conference proceedingConference paper

Abstract

This study offers an approach to estimate the rainfall kinetic energy (KE) by rain intensity (I) and radar reflectivity factor (Z) separately, or jointly, based on the one- or two-moment scaled raindrop size distribution (DSD) formulation, which contains (a) I and/or Z observations, (b) dimensionless probability density function (pdf) and (c) some intrinsic parameters. The key point of this formulation is to explain all variability of the DSD by the evolution of observations, hence the pdf and intrinsic parameters are considered as constants. A robust method is proposed to estimate the climatic values for these parameters, and our 28-month DSD data are used to test this estimation process. The results show that three relationships (KE-I, KE-Z and KE-IZ) which link the observations (I and/or Z) to rainfall kinetic energy (KE) are well established based on the climatic scaled DSD formulation. In particular, the combination of I and Z yields a significant improvement of estimation of KE.
Original languageEnglish
Title of host publicationProceedings of a symposium held in Exeter, UK, april 2011
PublisherIAHS
Pages141-146
Publication statusPublished - 2012

Publication series

NameIAHS publication
Number351
ISSN (Print)0144-7815

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