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http://dx.doi.org/10.3741/JKWRA.2014.47.12.1213

Experimental Study on the Sediment Sorting Processes of the Bed Surface by Geomorphic Changes in the Alluvial Channels with Mixed Grain Size  

Jang, Chang-Lae (Department of Civil Engineering, Korea National University of Transportation)
Publication Information
Journal of Korea Water Resources Association / v.47, no.12, 2014 , pp. 1213-1225 More about this Journal
Abstract
The development of bars and sediment sorting processes in the braided channels with the mixed grain sizes are investigated experimentally in this study. The sediment in the steep slope channels discharges with highly fluctuation. However, it discharges with relatively periodic cycles in the mild slope channels. The characteristics and amplitudes of the dominant bars are examined by double fourier analysis. The dimensionless sediment particle size decreases as the longitudinal bed elevation increases. However, the size increases as the longitudinal bed elevation decreases. As the dimensionless critical tractive force in the surface layer ratio to the force in the subsurface layer increases, the surface geometric mean size of sediments and the dimensionless sediment particle size decrease. This means that coarse matrix is formed with the dimensionless tractive force by the sediment selective sorting.
Keywords
mixed bed materials; sediment sorting; dimensionless tractive force; hiding effects;
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Times Cited By KSCI : 1  (Citation Analysis)
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