Settling Velocity of Suspended Sediments in Muthupet Estuary, India and Bouregreg Estuary, Morocco

2020 ◽  
pp. 125-146
Author(s):  
K. L. Priya ◽  
S. Haddout ◽  
S. Adarsh
Keyword(s):  
Settling Velocity ◽  
Suspended Sediments

Numerical Computation of Suspended Sediment Around a Marine Pipeline Close to the Flat Seabed

2011 ◽  
Author(s):  
Muk Chen Ong ◽  
Lars Erik Holmedal ◽  
Dag Myrhaug
Keyword(s):  
Suspended Sediment ◽  
Settling Velocity ◽  
Suspended Sediments ◽  
Navier Stokes ◽  
Suspended Sediment Transport ◽  
Flow Simulations ◽  
Reynolds Number Flow ◽  
Normal Distance ◽  
Number Flow ◽  
High Reynolds

The purpose of this paper is to investigate suspended sediment transport around a marine pipeline near the seabed by solving the Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations with the standard k-ε model. High Reynolds number flow simulations are considered in the present study. The suspended sediments are seeded upstream of the pipeline. Particle trajectories of the suspended sediments downstream of the pipeline have been visualized by using a Lagrangian approach. Effects of the gap (i.e. the normal distance between the pipeline and the seabed) and the sediment weight (i.e. taking into account sediment settling velocity) have been investigated and discussed.

scholarly journals SEDIMENT TRANSPORT DUE TO CURRENT-SUPPORTED TURBIDITY CURRENTS OVER AN ERODIBLE BED

2018 ◽  
pp. 33
Author(s):  
Celalettin Emre Ozdemir ◽  
Sahar Haddadian
Keyword(s):  
Boundary Layer ◽  
Settling Velocity ◽  
Critical Shear Stress ◽  
Suspended Sediments ◽  
Turbidity Currents ◽  
Gravitational Acceleration ◽  
Boundary Layer Turbulence ◽  
Erosion Coefficient ◽  
Self Motion

Wave- and current-supported turbidity currents (WCSTCs), are one of the chief participants in shaping the marine geomorphology. What makes WCSTCs different from other turbidity currents is that boundary layer turbulence is required to suspend the sediments rather than the self-motion of the turbidity currents. In the presence of a mild slope, the gravitational acceleration drives the suspended sediments offshore (Sternberg et al., 1996; Wright et al., 2001). Depending on what dominates the boundary layer turbulence (BLT), we further define two major subclasses of WCSTCs: (i) wave-supported (WSTCs), and (ii) current-supported turbidity currents (CSTCs). Although significant advances have been made on the details of WSTCs (Ozdemir et al., 2011; Yu et al., 2014; Cheng et al., 2015), less is known about CSTCs. The objective of present study is to investigate the role of alongshore currents on CSTC dynamics over an erodible bottom boundary. The focus here is to identify the possible role of erosion on CSTC dynamics, and assess the coupling between current-induced BLT and suspended sediments for various bed erodibility parameters, i.e. critical shear stress, erosion coefficient, and settling velocity.

On the factors affecting the settling velocity of fine suspended sediments in a shallow estuary

2015 ◽  
Vol 71 (2) ◽  
pp. 163-175 ◽  
Author(s):  
K. L. Priya ◽  
P. Jegathambal ◽  
E. J. James
Keyword(s):  
Settling Velocity ◽  
Suspended Sediments ◽  
Factors Affecting ◽  
Shallow Estuary

Methodology of Calculation the Terminal Settling Velocity Distribution of Irregular Particles for High Values of the Reynold’s Number/Metodologia Wyliczania Rozkładu Granicznej Prędkości Opadania Ziaren Nieregularnych Dla Wysokich Wartości Liczb Reynoldsa

2014 ◽  
Vol 59 (2) ◽  
pp. 553-562 ◽  
Author(s):  
Agnieszka Surowiak ◽  
Marian Brożek
Keyword(s):  
Velocity Distribution ◽  
Settling Velocity ◽  
Random Variables ◽  
Independent Random Variables ◽  
Calculation Algorithm ◽  
Shape Coefficient ◽  
Geometrical Properties ◽  
Size And Shape ◽  
Physical Density ◽  
Settling Velocity Distribution

Abstract Settling velocity of particles, which is the main parameter of jig separation, is affected by physical (density) and the geometrical properties (size and shape) of particles. The authors worked out a calculation algorithm of particles settling velocity distribution for irregular particles assuming that the density of particles, their size and shape constitute independent random variables of fixed distributions. Applying theorems of probability, concerning distributions function of random variables, the authors present general formula of probability density function of settling velocity irregular particles for the turbulent motion. The distributions of settling velocity of irregular particles were calculated utilizing industrial sample. The measurements were executed and the histograms of distributions of volume and dynamic shape coefficient, were drawn. The separation accuracy was measured by the change of process imperfection of irregular particles in relation to spherical ones, resulting from the distribution of particles settling velocity.

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