Effects of macro bed roughness elements in a fish pass: Scale model investigation

2020 ◽  
pp. 1843-1851
Author(s):  
D. Bousmar ◽  
A. Bodarwe ◽  
T. Cabo ◽  
X. Rollin
Keyword(s):  
Model Investigation ◽  
Scale Model ◽  
Fish Pass ◽  
Roughness Elements ◽  
Bed Roughness

Scale model investigation of ventilation parameters in a block cave mine

2021 ◽  
pp. 556-562
Author(s):  
A. Jha ◽  
Y. Pan ◽  
P. Tukkaraja ◽  
S.J. Sridharan
Keyword(s):  
Model Investigation ◽  
Scale Model

scholarly journals MEASUREMENTS OF MASS TRANSPORT OVER A ROUGH BED

1984 ◽  
Vol 1 (19) ◽  
pp. 78 ◽  
Author(s):  
J.F.A. Sleath
Keyword(s):  
Reynolds Numbers ◽  
Mean Velocity ◽  
Low Reynolds Numbers ◽  
Average Value ◽  
Wave Flume ◽  
Roughness Elements ◽  
Rough Bed ◽  
Median Diameter ◽  
Bed Roughness ◽  
High Reynolds

Measurements have been made with a laser doppler anemometer of the time-mean velocity of the fluid close to the bed in a wave flume. Both a rough bed, consisting of gravel of median diameter 11 mm, and a smooth bed were investigated. With the rough bed the time-mean velocity at a given height was found to be strongly dependent on position relative to prominent roughness elements. At one point the time-mean drift at a given height might be in the direction of wave propagation while, at another, in the opposite direction. Significant variation in time-mean drift with horizontal position was observed at all values of Reynolds number tested. The effect of bed roughness on the average value of the time-mean velocity at a given height was found to be most marked at low Reynolds numbers: the maximum near bed value with this gravel bed was about 3 times that for a smooth bed at the lowest Reynolds numbers tested. At the highest Reynolds numbers there was no clear difference between the rough and smooth bed values even though the boundary layer over the rough bed was fully turbulent whereas that over the smooth bed was laminar. However, at these high Reynolds numbers both the rough and the smooth beds showed a reduction in drift velocity below that predicted by Longuet-Higgins (9) because of the increased importance of higher harmonics in the flow.

scholarly journals Recharge and Nitrate Transport Through the Deep Vadose Zone of the Loess Plateau: A Regional‐Scale Model Investigation

2018 ◽  
Vol 54 (7) ◽  
pp. 4332-4346 ◽  
Author(s):  
Tuvia Turkeltaub ◽  
Xiaoxu Jia ◽  
Yuanjun Zhu ◽  
Ming‐An Shao ◽  
Andrew Binley
Keyword(s):  
Loess Plateau ◽  
Vadose Zone ◽  
Regional Scale ◽  
Model Investigation ◽  
Scale Model ◽  
Nitrate Transport ◽  
The Loess Plateau
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