Experimental comparison of some techniques for estimating natural raindrop size distribution on the south coast of the Caspian Sea, Iran

SH Sadeghi, Z Abdollahi… - Hydrological Sciences …, 2013 - Taylor & Francis
Hydrological Sciences Journal, 2013Taylor & Francis
Abstract Knowledge of the relationship between rainfall intensity and kinetic energy and its
variations in time and space is important for the prediction of erosion hazard. Kinetic energy
and erosivity are also strongly controlled by raindrop size. However, studies on raindrop
measurement and different practical techniques have been rarely documented. The current
study therefore aimed to apply existing raindrop-size measurement techniques—the
photographic, flour-pellet and stain methods, as well as an innovative flour-stain method …
Abstract
Knowledge of the relationship between rainfall intensity and kinetic energy and its variations in time and space is important for the prediction of erosion hazard. Kinetic energy and erosivity are also strongly controlled by raindrop size. However, studies on raindrop measurement and different practical techniques have been rarely documented. The current study therefore aimed to apply existing raindrop-size measurement techniques—the photographic, flour-pellet and stain methods, as well as an innovative flour-stain method—and to evaluate their applicability at several intensities in Mazandaran Province, Iran. The distribution of raindrop size obtained by the different methods was recorded and compared with those obtained through applying a high-speed imaging technique. All the analyses were made with the help of a SPSS software package. The results showed that the raindrop diameters ranged from 0.2 to 5.16 mm at different rainfall intensities. Statistical comparison of the methods using the Duncan test showed that the flour-pellet method presented similar results to the photographic technique; it was concluded that this can be used as a practical and inexpensive method to estimate a wide range of raindrop sizes.
Editor Z.W. Kundzewicz
Citation Sadeghi, S.H., Abdollahi, Z., and Khaledi Darvishan, A., 2013. Experimental comparison of some techniques for estimating natural raindrop size distribution on the south coast of the Caspian Sea, Iran. Hydrological Sciences Journal, 58 (6), 1374–1382.
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