scholarly journals Influence of Gravel-Bed Porosity and Grain Orientation on Bulk Flow Resistance

Water ◽  
2018 ◽  
Vol 10 (5) ◽  
pp. 561 ◽  
Author(s):  
Christy Navaratnam ◽  
Jochen Aberle ◽  
Jie Qin ◽  
Pierre-Yves Henry
Keyword(s):  
Grain Orientation ◽  
Flow Resistance ◽  
Bulk Flow ◽  
Gravel Bed ◽  
Bed Porosity

scholarly journals An experimental investigation on the flow resistance over a porous gravel-bed surface and its non-porous counterpart

2018 ◽  
Vol 40 ◽  
pp. 05073
Author(s):  
Christy Ushanth Navaratnam ◽  
Jochen Aberle ◽  
Jie Qin ◽  
Pierre-Yves Henry
Keyword(s):  
Experimental Investigation ◽  
Surface Structure ◽  
Grain Orientation ◽  
Flow Resistance ◽  
Laboratory Experiments ◽  
Flow Characteristics ◽  
Experimental Setup ◽  
Preliminary Results ◽  
Gravel Bed ◽  
Bed Porosity

This paper presents preliminary results from laboratory experiments which were specifically designed to determine the flow resistance over a water-worked gravel-bed and its impermeable counterpart (cast-bed). The technique used to create the cast-bed is introduced, followed by the description of the experimental setup and the procedure to quantify flow resistance over both the water-worked and cast-bed. The influence of the grain orientation on flow resistance was investigated in an additional set of experiments by rotating the cast-bed through 180° in the flume. The main focus of the paper is on the comparison of the bulk flow characteristics for the three different cases for which the beds are characterized not only by the same characteristic grain-diameter but also by an identical surface structure. The obtained results show that the porous, non-porous bed and rotated bed result in different flow resistance and that both bed porosity and grain-orientation have a significant effect on flow resistance.

Flow resistance of gravel bed channels

2014 ◽  
Vol 29 (1) ◽  
pp. 126-132 ◽  
Author(s):  
Wen C. WANG ◽  
David R. DAWDY
Keyword(s):  
Flow Resistance ◽  
Gravel Bed

scholarly journals Block ramps for stream power attenuation in gravel-bed streams: a review

2020 ◽  
Author(s):  
Rakesh Kumar Chaudhary ◽  
Nayan Sharma ◽  
Zulfequar Ahmad
Keyword(s):  
Energy Dissipation ◽  
Flow Resistance ◽  
Simple Technique ◽  
State Of The Art ◽  
Flow Characteristics ◽  
Stream Power ◽  
Gravel Bed ◽  
The Past ◽  
Gravel Bed Streams ◽  
Block Ramp

Abstract Application of block ramp technique in steep gradient streams for energy dissipation as well as to maintain river stability finds increasing favor amongst researchers and practitioners in river engineering. This paper dwells on a comprehensive state-of-the-art review of flow resistance, energy dissipation,flow characteristics, stability, and drag force on block ramp by various investigators in the past. The forms and equations for each type are thoroughly discussed with the objective of finding the grey areas and gaps. While, more research is warranted further to improve the equations, essential for design analysis. Block ramps can be a promising simple technique to achieve reasonable attenuation of devastating fluvial forces unleashed in gravel-bed streams during cloud bursts.

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