An empirical model for the variation of rain drop size distribution with rain rate at a few locations in southern India

Details An empirical model for the variation of rain drop size distribution with rain rate at a few locations in southern India An empirical model for the variation of rain drop size distribution with rain rate at a few locations in southern India

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009adspr..43..837h&link_type=abstract

Advances in Space Research, Volume 43, Issue 5, p. 837-844.

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Scientific paper

A Joss Waldvogel impact type disdrometer was installed at four different locations in the Indian peninsula during various periods from 2001 till date. The data are analysed to study the nature of rain drop size distribution (DSD) in this region. Out of the three well known distributions that describe DSD, namely, the Marshall Palmer, Gamma and Lognormal, it has been found that Lognormal distribution fits the DSD in this region better than the other ones. Lognormal distributions for different rain rates were then derived by fitting the lognormal function to the data using a curve fitting software. Then the variation of fit parameters with rain rate was evaluated. Incorporating these variations, into the Lognormal distribution, an empirical equation that describes the DSD in this region for different rain rates was derived. Then this equation was tested with sample data from each of these stations. The data used for validation were not used for fitting lognormal equation to derive the fit parameters. The correlation between the DSD measured and derived using the empirical model was found to be quite good (0.9) except in some cases where the coefficient dropped to 0.75. The empirical model can be updated when more data are available.

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