Wave and tidal current sorting of shelf sediments southwest of England (summary only)

1975 ◽  
Vol 279 (1288) ◽  
pp. 219-220 ◽  
Keyword(s):  
Tidal Current ◽  
Tidal Currents ◽  
Transport Processes ◽  
Bottom Current ◽  
Sediment Grain Size ◽  
Median Diameter ◽  
Shelf Sediments ◽  
Induced Currents ◽  
Wave Induced ◽  
Drag Velocity

The relative roles of waves and tidal currents in sediment transport processes on the continental shelf off Lands End, southwest of England, are discussed in the light of ( a ) sediment grain size and boundary layer measurements in tidal currents, ( b ) regional variation in sediment parameters in relation to peak tidal and wave-induced currents, and ( c ) photographic and television observations of bedforms. ( a ) The sediments in this temperate study area are mainly zoogenic sands. The size parameters have been determined by settling velocity in a specially developed sedimentation tower. The average median diameter of sediments from 144 stations is dm^ — 1.40^ (medium grade sand), with a standard deviation of 0.43^. The linear bottom current which will just move this range of particle size must attain a drag velocity ( U *) of 2.37 cm s - 1 . This value is exceeded, only slightly, by the maximum drag velocity of 2.6 cm s - 1 measured in a bottom tidal current in the area. Thus, tidal currents alone are just competent to move the sediments. This movement is intermittent and limited to certain states of the tide.

scholarly journals Numerical simulation of the three-dimensional wave-induced currents on unstructured grid

2017 ◽  
Vol 31 (5) ◽  
pp. 539-548
Author(s):  
Ping Wang ◽  
Ning-chuan Zhang ◽  
Shuai Yuan ◽  
Wei-bin Chen
Keyword(s):  
Numerical Simulation ◽  
Unstructured Grid ◽  
Three Dimensional ◽  
Induced Currents ◽  
Wave Induced ◽  
Dimensional Wave

scholarly journals ESTIMATION OF ELECTRICITY GENERATED FROM TIDAL ENERGY IN BEDONO VILLAGE OF DEMAK REGENCY

2020 ◽  
Vol 4 (9) ◽  
pp. 13-17
Author(s):  
Agus Margiantono ◽  
Titik Nurhayati ◽  
Wahib Hasbullah
Keyword(s):  
Electric Power ◽  
Current Velocity ◽  
Tidal Current ◽  
Tidal Energy ◽  
Tidal Currents ◽  
Active Power ◽  
Tidal Current Velocity ◽  
The Village

In some places in the village of Bedono Demak Regency there is a location with high tidal current velocity, the coordinates of the Location is 6 ° 55'29.0 "S 110 ° 29'11.4" E. In this study estimated the amount of electric power that can be generated from tidal currents in the village Bedono. Estimates are made by modeling the location and the Darrieus turbine using the CFD (Computating Fluid Dinamyc) Software. From the research that has been done to get the results of electric power that can be produced in the village Bedono highest at 14-16 times 3469.413W and lowest 39.002W at 22-24 hours according to the CFD is the highest active power occurred at 14-16 at 3197.064W and the lowest 35.941W at 22-24 hours.

scholarly journals Predictive model for wave-induced currents and 3D beach evolution based on FAVOR Method

2010 ◽  
Vol 2 (2) ◽  
pp. 68-74
Author(s):  
Masamitsu Kuroiwa ◽  
Mazen Abualtayef ◽  
Tetsushi Takada ◽  
Ahmed Khaled Sief ◽  
Yuehi Matsubara
Keyword(s):  
Predictive Model ◽  
Induced Currents ◽  
Wave Induced

Sediment Resuspension and Transport by Internal Solitary Waves

2019 ◽  
Vol 51 (1) ◽  
pp. 129-154 ◽  
Author(s):  
Leon Boegman ◽  
Marek Stastna
Keyword(s):  
Internal Waves ◽  
Laboratory Experiments ◽  
Sediment Resuspension ◽  
Vital Role ◽  
Continental Margins ◽  
Scale Models ◽  
Key Driver ◽  
Induced Currents ◽  
Wave Induced ◽  
Oriented Research

Large-amplitude internal waves induce currents and turbulence in the bottom boundary layer (BBL) and are thus a key driver of sediment movement on the continental margins. Observations of internal wave–induced sediment resuspension and transport cover significant portions of the world's oceans. Research on BBL instabilities, induced by internal waves, has identified several mechanisms by which the BBL is energized and sediment may be resuspended. Due to the complexity of the induced currents, process-oriented research using theory, direct numerical simulations, and laboratory experiments has played a vital role. However, experiments and simulations have inherent limitations as analogs for oceanic conditions due to disparities in Reynolds number and grid resolution, respectively. Parameterizations are needed for modeling resuspension from observed data and in larger-scale models, with the efficacy of parameterizations based on the quadratic stress largely determining the accuracy of present field-scale efforts.

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