1. bookVolume 66 (2018): Issue 1 (March 2018)
Journal Details
First Published
28 Mar 2009
Publication timeframe
4 times per year
access type Open Access

Laboratory studies on bedload transport under unsteady flow conditions

Published Online: 22 Nov 2017
Volume & Issue: Volume 66 (2018) - Issue 1 (March 2018)
Page range: 23 - 31
Received: 29 Sep 2016
Accepted: 20 Mar 2017
Journal Details
First Published
28 Mar 2009
Publication timeframe
4 times per year

Two sets of triangular hydrographs were generated in a 12-m-long laboratory flume for two sets of initial bed conditions: intact and water-worked gravel bed. Flowrate ranging from 0.0013 m3 s-1 to 0.0456 m3 s-1, water level ranging from 0.02 m to 0.11 m, and cumulative mass of transported sediment ranging from 4.5 kg to 14.2 kg were measured. Then, bedload transport rate, water surface slope, bed shear stress, and stream power were evaluated. The results indicated the impact of initial bed conditions and flow unsteadiness on bedload transport rate and total sediment yield. Difference in ratio between the amount of supplied sediment and total sediment yield for tests with different initial conditions was observed. Bedload rate, bed shear stress, and stream power demonstrated clock-wise hysteretic relation with flowrate. The study revealed practical aspects of experimental design, performance, and data analysis. Water surface slope evaluation based on spatial water depth data was discussed. It was shown that for certain conditions stream power was more adequate for the analysis of sediment transport dynamics than the bed shear stress. The relations between bedload transport dynamics, and flow and sediment parameters obtained by dimensional and multiple regression analysis were presented.


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