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http://dx.doi.org/10.3741/JKWRA.2018.51.8.655

An application of image processing technique for bed materials analysis in gravel bed stream: focusing Namgang  

Kim, Ki Heung (Department of Civil Engineering, Gyeongnam National University of Science and Technology)
Jung, Hea Reyn (Department of Civil Engineering, Gyeongnam National University of Science and Technology)
Publication Information
Journal of Korea Water Resources Association / v.51, no.8, 2018 , pp. 655-664 More about this Journal
Abstract
The riverbed material survey is to investigate the particle size distribution, specific gravity, porosity, etc. as basic data necessary for river channel plan such as calculation of sediment transport and change of river bed. In principle, the survey spots are 1 km interval in the longitudinal direction of the river and 3 points or more in the 1 cross section. Therefore, depending on longitudinal length of the river to be investigated, the number of surveyed sites is very large, and the time and cost for the investigation are correspondingly required. This study is to compare the particle size analysis method with the volumetric method and the image analysis method in work efficiency and cost and to examine the applicability of the image analysis method. It was confirmed that the diameter of the equivalent circle converted by the image analysis method can be applied to the analysis of bed material particle size. In the gravel stream with a particle size of less than 10 cm and a large shape factor, the analytical result of the bed material by the image analysis method is accurate. However, when the shape factor decreases as the particle size increases, the error increases. In addition, analysis results of the work efficiency and cost of the volume method and the image analysis method showed a reduction of about 80%.
Keywords
Bed materials; Particle size distribution; Sediment transport; Volumetric method; Work efficiency;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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