DOI: 10.5593/SGEM2014/B23/S10.018


Z. Kaczynska, M. Kowalczyk
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-12-4 / ISSN 1314-2704, June 19-25, 2014, Book 2, Vol. 3, 145-152 pp

The primary aim of this study is to determine the velocity distribution on water surface of the river from a digital camera recorded image sequences. The study of an object such as river, which has irregular shape and liquid state, requires the use of signalized points, that can be clearly identified on all video frames. Location of each point in every frame was measured and then transformed into coordinate system associated with the river. For this purpose, a projective transformation of a plane was used. Then, it was possible to calculate the displacement vectors between the successive positions of points in the sequence. Speed ??on the water surface was determined by dividing the value of displacement and the time interval between frames. Based on the discrete speed values, the interpolation was carried out and the velocity distribution maps were created. Velocity distribution maps were generated for the speed values calculated between the positions of points, as well as their components, according to the course of the river and perpendicular to the course of the river. When registering measuring material, three types of points were used in order to investigate the effect of their size and weight on the results. Received distributions were reviewed for compliance with the theoretical assumptions in the field of hydrology. Their utility to determine the shape of the river bottom, or finding obstacles under the surface of the water, was also analyzed. In the end, it was considered which technologies are the best to determine the velocity distribution on water surface and for what kind rivers doing this kind of research is reasonable.

Keywords: sequential images, close-range photogrammetry, river, velocity distribution