<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Kinetic energy and corresponding erosive force of rainfall are strongly influenced by raindrop. The present paper aims to explore the raindrop size variation during rainfall events with different intensities in northern Iran by applying the processes of camera-taken photographs. Five rainfall intensities of 1 to 10 mm h<sup>–1</sup> that occur frequently in the study area were analyzed. A camera with a very short exposure time was used to record the distribution of raindrops size. The raindrops diameters of the rain events ranged from &lt;0.2 to 5.1 mm while the majority of them were between 1 and 2 mm. The results also showed that the variation of rainfall intensity significantly influenced (P&lt; 0.05) raindrops size. Image processing was proven as an accurate technique of translation between the human visual system and digital imaging devices. The findings of the study can be practically utilized by researchers who work in the field of soil erosion and meteorology.</p>
</abstract>

Kinetic energy and corresponding erosive force of rainfall are strongly influenced by raindrop. The present paper aims to explore the raindrop size variation during rainfall events with different intensities in northern Iran by applying the processes of camera-taken photographs. Five rainfall intensities of 1 to 10 mm h–1 that occur frequently in the study area were analyzed. A camera with a very short exposure time was used to record the distribution of raindrops size. The raindrops diameters of the rain events ranged from <0.2 to 5.1 mm while the majority of them were between 1 and 2 mm. The results also showed that the variation of rainfall intensity significantly influenced (P< 0.05) raindrops size. Image processing was proven as an accurate technique of translation between the human visual system and digital imaging devices. The findings of the study can be practically utilized by researchers who work in the field of soil erosion and meteorology.

Detailed procedure for outdoor measurement of raindrop size distribution using photogrammetry

Department of Watershed Management Engineering, Faculty of Natural Resources and Marine Sciences

Soil Conservation and Watershed Management Research Department

Journal of Hydrology and Hydromechanics

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Kinetic energy and corresponding erosive force of rainfall are strongly influenced by raindrop. The present paper aims to explore the raindrop size variation...

Detailed procedure for outdoor measurement of raindrop size distribution using photogrammetry

Published Online: May 21, 2021

Page range: 171 - 179

Received: Oct 22, 2020

Accepted: Mar 01, 2021

DOI: https://doi.org/10.2478/johh-2021-0007

Keywords
Raindrop Size Distribution, Image processing, Rainfall Intensity, Rain Erosivity

© 2021 Zahra Abdollahi et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Detailed procedure for outdoor measurement of raindrop size distribution using photogrammetry

Published Online: May 21, 2021

Page range: 171 - 179

Received: Oct 22, 2020

Accepted: Mar 01, 2021

DOI: https://doi.org/10.2478/johh-2021-0007

KeywordsRaindrop Size Distribution, Image processing, Rainfall Intensity, Rain Erosivity

© 2021 Zahra Abdollahi et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Raindrop Size Distribution, Image processing, Rainfall Intensity, Rain Erosivity