An experimental flume study on the formation of transverse ribs

1978 ◽  
Author(s):  
T J Day ◽  
B C McDonald





Hydrobiologia ◽  
2018 ◽  
Vol 820 (1) ◽  
pp. 165-173 ◽  
Author(s):  
Atish N. Vadher ◽  
Jonathan Millett ◽  
Rachel Stubbington ◽  
Paul J. Wood


2014 ◽  
Vol 39 ◽  
pp. 81-87
Author(s):  
T. Kakinuma ◽  
T. Inoue ◽  
R. Akahori ◽  
A. Takeda

Abstract. The authors made erodible bed experiments under steady flow condition at the Chiyoda Experimental Flume, a large-scale facility constructed on the floodplain of the Tokachi River, and observed sand waves on the bed of the flume. In this study, the characteristics of the sand waves are examined along the longitudinal survey lines and confirmed to be dunes. Next, the authors estimated Manning's roughness coefficients from the observed hydraulic values and assumed that the rise of the coefficients attributed to the sand wave development. Finally, vertical flow distribution on the sand waves are examined, and observed velocity distribution on the crest of waves found to be explained by the logarithmic distribution theory.



2021 ◽  
Author(s):  
Jan-Pascal Boos ◽  
Benjamin Gilfedder ◽  
Sven Frei

<p>Rivers and streams are the dominant transport vectors for microplastic (MP) input into marine environments. During transport, complex physicochemical interactions between particles, water and river sediments influence particle mobility and retention. The specific transport mechanisms of MP in fluvial systems are not yet fully understood, and the main reason lies in the limitation in reliable data derived from experimental analysis.</p><p>In our subproject of the ‘CRC 1357 Microplastics’, we investigate the hydrodynamic mechanisms that control the transport and retention behavior of MP in open channel flows and streambed sediments. In an experimental flume environment, we create realistic hydrodynamic and hyporheic flow conditions by using various porous media (e.g. glass beads or sand) and bedform structures (e.g. riffle-pool sequences, ripples and dunes), modelled from real stream systems.</p><p>The method developed here can quantitatively analyze the transport of pore-scale particles (1-40 µm) based on fluorometric techniques. Particle velocity distributions and particle transport are measured using Particle-Image-Velocimetry and Laser-Doppler-Velocimetry. With our setup, we can quantitatively investigate time-resolved MP transport and retention through the aqueous and solid phase in a flume scale experiment.</p>



Author(s):  
Florent Grasso ◽  
Hervé Michallet ◽  
Eric Barthélemy
Keyword(s):  


2018 ◽  
Vol 40 ◽  
pp. 02018 ◽  
Author(s):  
Till Branß ◽  
Francisco Núñez-González ◽  
Andreas Dittrich ◽  
Jochen Aberle

Natural levees can be observed worldwide in nearly all river systems characterized by frequent flooding in combination with the transport of suspended bed material. Several parameters and processes have been suggested to explain the formation and the highly variable geometry of natural levees. However, the effect of bedforms migrating in the main-channel has not been amongst the studied parameters and processes. To fill this gap, this study investigates the relationship between bedforms and natural levee formation by flume experiments. Experiments were conducted in a 2 m wide and 30 m long sediment recirculating flume, monitoring the bed level elevation in the main channel by ultrasonic sensors as well as recording the levee development on the floodplain by a camera. The effect of different bed configurations on the developed levees is compared, and discussed, showing that bedforms could enhance levee formation.



1990 ◽  
Vol 15 (4) ◽  
pp. 313-328 ◽  
Author(s):  
G. Govers ◽  
W. Everaert ◽  
J. Poesen ◽  
G. Rauws ◽  
J. De Ploey ◽  
...  


Aquaculture ◽  
2011 ◽  
Vol 319 (3-4) ◽  
pp. 459-465 ◽  
Author(s):  
R.A. Corner ◽  
P.A. Davies ◽  
A.J.S. Cuthbertson ◽  
T.C. Telfer
Keyword(s):  
Sea Lice ◽  


1979 ◽  
Vol 61 (1/2) ◽  
pp. 67 ◽  
Author(s):  
Alan V. Jopling ◽  
Donald L. Forbes
Keyword(s):  


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