Journal ArticleDOI
Inference of raindrop size distributions from measurements of rainfall rate and attenuation at infrared wavelengths
A. Maitra,C. J. Gibbins +1 more
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TLDR
In this article, a new technique is proposed to infer the parameters in a generalized three-parameter gamma function model for the distribution of drop sizes in rain, from measurements of rainfall rate and path attenuation through the rain at infrared wavelengths, where raindrop cross sections are essentially independent of frequency, and comparison with simultaneously measured rain attenuations in the millimetric wavebands.Abstract:
A new technique is proposed to infer the parameters in a generalized three-parameter gamma function model for the distribution of drop sizes in rain, from measurements of rainfall rate and path attenuation through the rain at infrared wavelengths, where raindrop cross sections are essentially independent of frequency, and comparison with simultaneously measured rain attenuations in the millimetric wavebands. The technique is shown to be single-valued and stable, for a particular form of the gamma function. The resultant drop size distributions have been used to calculate millimeter-wave rain attenuations which are in excellent agreement with those measured.read more
Citations
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Microwave link dual-wavelength measurements of path-average attenuation for the estimation of drop size distributions and rainfall
R.F. Rincon,Roger H. Lang +1 more
TL;DR: Microwave attenuation measurements made on a 2.3-km microwave link are employed to estimate drop size distributions (DSD), rainfall rate, and rainfall accumulation to develop a dual-wavelength analytical technique to invert two parameters of a path-average gamma DSD.
Journal ArticleDOI
Modeling of raindrop size distributions from multiwavelength rain attenuation measurements
A. Maitra,C. J. Gibbins +1 more
TL;DR: In this paper, the distribution of raindrop sizes, in terms of the lognormal and modified gamma distribution, from multi-wavelength rain attenuation measurements at millimeter and infrared wave bands have been demonstrated.
Journal ArticleDOI
Modelling of Drop Size Distribution of Rain from Rain Rate and Attenuation Measurements at Millimeter and Optical Wavelengths
TL;DR: In this article, a technique for modelling of rain drop size distributions at Calcutta in terms of negative exponential function, from the measurements of rain rate and attenuation over a dual wavelength LOS link at millimeter and optical frequencies, is described.
Dissertation
Modélisation statistique de la diversité multi-site aux fréquences comprises entre 20 et 50 GHz
TL;DR: In this article, the authors propose the definition of a new nouveau modele, le modele WRF-EMM, permettant de generer des statistiques de propagation sur une zone geographique of 100 x 100 km2.
Prediction of electromagnetic wave attenuation due to water in atmosphere. 1. Attenuation due to rain
Alytis Gruodis,Stasys Tamoöißnas +1 more
TL;DR: According to the climatic peculiarities of Lithuania, an appropriate model for calculation of electromagnetic wave attenuation due to rain (rain attenuation) was chosen as discussed by the authors, and a large quantity of precipitation data was computed and the specific rain attenuation considering the peculiarities in localities.
References
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Journal ArticleDOI
The terminal velocity of fall for water droplets in stagnant air
Ross Gunn,Gilbert D. Kinzer +1 more
TL;DR: In this article, the terminal velocities for distilled water droplets falling through stagnant air are accurately determined using a new method employing electronic techniques, and the over-all accuracy of the massterminal-velocity measurements is better than 0.7 per cent.
Journal ArticleDOI
Natural Variations in the Analytical Form of the Raindrop Size Distribution
TL;DR: In this paper, a three-parameter gamma distribution was used for dual-measurement techniques to determine rainfall rate, and the relationship between pairs of integral rainfall parameters using a three parameter gamma drop size distribution was investigated.
Journal ArticleDOI
The relation of raindrop-size to intensity
J. Otis Laws,Donald A. Parsons +1 more
TL;DR: The applicability of such results to conditions of natural rainfall has been thrown in doubt as discussed by the authors, and the results have been found to be affected by the drop-size and velocity of the artificial rains applied.