scholarly journals LABORATORY TESTS ON ARTIFICIAL SEAWEED

1970 ◽  
Vol 1 (12) ◽  
pp. 63
Author(s):  
W.A. Price ◽  
K.W. Tomlinson ◽  
D.H. Willis
Keyword(s):  
Coal Particle ◽  
Laboratory Tests ◽  
Water Velocity ◽  
Bed Sediment ◽  
Velocity Measurements ◽  
Wave Conditions ◽  
Particle Velocities ◽  
Model Water

Tests are described m which the effect of artificial seaweed on bed sediment movements due to waves was studied in a model Water velocities near the bed and coal particle velocities on the bed, within the seaweed array, were measured over a range of wave conditions and densities of packing of the seaweed The water velocity measurements were erratic, probably due to additional turbulence caused by the seaweed Coal particle movements on the bed were slowed down in the presence of seaweed.

scholarly journals Analysis of in situ water velocity distributions in the lowland river floodplain covered by grassland and reed marsh habitats - a case study of the bypass channel of Warta River (Western Poland)

2017 ◽  
Vol 65 (4) ◽  
pp. 325-332 ◽  
Author(s):  
Ireneusz Laks ◽  
Krzysztof Szoszkiewicz ◽  
Tomasz Kałuża
Keyword(s):  
Acoustic Doppler Current Profiler ◽  
Water Velocity ◽  
Concrete Slabs ◽  
Lowland River ◽  
Vegetation Types ◽  
Velocity Measurements ◽  
Flow Energy ◽  
Current Profiler

AbstractThe analysis of in situ measurements of velocity distribution in the floodplain of the lowland river has been carried out. The survey area was located on a bypass channel of the Warta River (West of Poland) which is filled with water only in case of flood waves. The floodplain is covered by grassland and reed marsh habitats. The velocity measurements were performed with an acoustic Doppler current profiler (ADCP) in a cross-section with a bed reinforced with concrete slabs. The measured velocities have reflected the differentiated impact of various vegetation types on the loss of water flow energy. The statistical analyses have proven a relationship between the local velocities and the type of plant communities.

scholarly journals FULL SCALE NEAR SURFACE WATER PARTICLE VELOCITIES AND PRESSURES ACTING ON AN INCLINED TUBULAR MEMBER

1980 ◽  
Vol 1 (17) ◽  
pp. 113
Author(s):  
Fritz Busching ◽  
Eckehard Martini
Keyword(s):  
Reynolds Numbers ◽  
Wave Force ◽  
Field Investigation ◽  
Velocity Measurements ◽  
Near Surface ◽  
Water Particle ◽  
Wave Kinematics ◽  
Pressure Distributions ◽  
Particle Velocities ◽  
Offshore Wave

A field investigation programme on simultaneous wave force and water particle velocity measurements is decribed with reference to an inclined tubular member subjected to offshore wave kinematics. First measurements at supercritical Reynolds numbers indicate strong irregularities in successively taken pressure distributions on the circumference of the test section as well as in the velocity vectors. The influence of superimposed tidal currents is obvious.

scholarly journals NEAR SHORE MORPHODYNAMIC OF DRAINED BEACHES

2011 ◽  
Vol 1 (32) ◽  
pp. 8 ◽  
Author(s):  
Leonardo Damiani ◽  
Antonio Felice Petrillo ◽  
Alessandra Saponieri
Keyword(s):  
Unsaturated Zone ◽  
Morphological Study ◽  
Laboratory Tests ◽  
Drainage System ◽  
Hydrodynamic Effect ◽  
Shore Zone ◽  
Infiltration Capacity ◽  
The World ◽  
Near Shore ◽  
Wave Conditions

The paper deals with a morphological study on a drained beach, under different wave conditions. The Beach Drainage System (BDS) should artificially increase beach infiltration capacity by installing a drain under the beach face. The system produces a water table lowering and, consequently, an increasing of unsaturated zone (Damiani et Al.,2009); moreover, a vertical infiltration flow increases effective weight of grains, producing a better stability. According to the above hydrodynamic effect BDS should influence cross shore sediment transport in the shore zone. Many BDS prototypes have been installed around the world; also in Italy some examples are available, i.e. Ostia (Damiani et Al.,2003), Alassio and Procida (Vicinanza et Al.,2009). Field monitoring is very useful to assess the effectiveness of the system, even if with uncertainties in results, affected by the impossibility to control the boundary conditions. Laboratory tests (Damiani et Al.,2009) could be used in defining how does the system work in different wave conditions and drain configurations.

HYDRAULIC RESISTANCES OF ANTECHAMBER AND WATER RECIEVING CHAMBERS

2018 ◽  
pp. 44-46
Author(s):  
M Mamajanov ◽  
B Shakirov ◽  
B.B Shakirov
Keyword(s):  
Pressure Loss ◽  
Laboratory Tests ◽  
Current Flow ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Pumping Station ◽  
Loss Coefficients ◽  
Pumping Units ◽  
Inlet Chamber ◽  
Model Water

In this article itisconcidereddiscusses current flow forebays and the conditions for its entry into the water inlet chamber at different numerical combinations of pumping units. The results of laboratory tests on model water inlet pumping station installations to determine the pressure loss coefficients and hydraulic resistances and optimum operating conditions.

scholarly journals Water Velocity Measurements on a Vertical Barrier Screen at the Bonneville Dam Second Powerhouse

Energies ◽  
2011 ◽  
Vol 4 (11) ◽  
pp. 2038-2048 ◽  
Author(s):  
James S. Hughes ◽  
Z. Daniel Deng ◽  
Mark A. Weiland ◽  
Jayson J. Martinez ◽  
Yong Yuan
Keyword(s):  
Water Velocity ◽  
Velocity Measurements ◽  
Vertical Barrier

Particle velocity and sediment transport at the limit of deposition in sewers

2013 ◽  
Vol 67 (5) ◽  
pp. 959-967 ◽  
Author(s):  
J. J. Ota ◽  
G. S. Perrusquía
Keyword(s):  
Shear Stress ◽  
Sediment Transport ◽  
Particle Velocity ◽  
Water Velocity ◽  
Angle Of Repose ◽  
Bed Load ◽  
Bed Shear Stress ◽  
Transport Capacity ◽  
Sediment Particle ◽  
Velocity Measurements

This paper focuses on the sediment particle while it is transported at the limit of deposition in storm sewers, i.e. as bed load at the limit of concentration that leads to sediment deposition. Although many empirical sediment transport equations are known in the literature, there is only limited knowledge concerning particle velocity. Sediment particle and sphere velocity measurements were carried out in two pipe channels and these results led to the development of a semi-theoretical equation for sediment transport at the limit of deposition in sewers. Even in the transport process without deposition, sediment movement is slower than water velocity and depends on the angle of repose of sediment with a diameter d on the roughness k of the pipe channel. Instead of classical dimensionless bed shear stress ψ, a modified dimensionless bed shear stress ψ (d/k)2/3 was suggested, based on the angle of repose and this parameter was proved to be significant for quantifying the transport capacity. The main purpose of this article is to emphasize the importance of careful observation of experiments. Not only number of tests, but physical understanding are essential for better empirical equations.

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