Rain Drop Size Distribution Modelling in Singapore - Critical Diameters

Author

Lee, Y.H. ; Lakshmi, S. ; Ong, Jin Teong

Author_Institution

Nanyang Technol. Univ., Singapore

fYear

2007

fDate

11-16 Nov. 2007

Firstpage

1

Lastpage

5

Abstract

This paper analyzes and presents the measured drop size distribution (DSD) for five rain rates 4.20, 22.80, 66.54, 100.57 and 141.27 mm/hr in Singapore (1deg20´N, 103deg41´E). The ranges of rain drop diameters that are critical to the DSD are identified and the significance of their relationship is analyzed. The modified gamma model is used to describe the DSD in Singapore. Root mean square error (RMSE) in percentage is calculated for all the rain rates for both lognormal (using maximum likelihood estimators and using moment estimators) and modified gamma models. Over the critical diameter range (0.771 mm to 5.3 mm), the modified gamma model fits very well with the measured data and produces least RMSE compared with other models except at the lower rain rate considered.

Keywords

atmospheric techniques; drops; gamma distribution; maximum likelihood estimation; mean square error methods; method of moments; radiowave propagation; rain; tropospheric electromagnetic wave propagation; RMSE; Singapore; lognormal model; maximum likelihood estimators; microwave signal attenuation; modified gamma model; moment estimators; rain drop size distribution modelling; root mean square error; Drop Size Distribution; critical diameters; lognormal model; modified gamma model; root mean square error;

fLanguage

English

Publisher

iet

Conference_Titel

Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on

Conference_Location

Edinburgh

Print_ISBN

978-0-86341-842-6

Type

conf

Filename

4458343