Oscillating turbulent boundary layer with suspended sediments

A dynamic boundary layer model with simultaneous interactions between constant, oscillatory, and turbulent flow; suspended sediments; and erosion is developed. The model appears to be verified as well as the existing data permits. In purely oscillatory flow most of the state variables appear to be associated with a turbulent kinetic energy maximum developing near the bottom and phase angle π/2 and propagating upward thereafter. The maximum horizontal sediment flux is approximately proportional to the third power of the maximum turbulent stress. A channel flow with constant pressure gradient may be strongly reduced by the presence of waves. The waves may also increase the suspended sediment concentration significantly.

[1]  Masayuki Kashiwayanagi,et al.  Experiments on the turbulence statistics and the structure of a reciprocating oscillatory flow , 1983, Journal of Fluid Mechanics.

[2]  J. F. A. Sleath,et al.  Sea bed mechanics , 1984 .

[3]  Peter Bradshaw,et al.  Engineering Calculation Methods for Turbulent Flow , 1981 .

[4]  R. Simons,et al.  Sediment Transport due to Waves and Tidal Currents , 1984 .

[5]  A.M.O. Smith,et al.  Turbulence models and their application in hydraulics: W. Rodi, University of Karlsruhe, International Association for Hydraulic Research, Rotterdamseweg 185, 2600 MH Delft, The Netherlands , 1981 .

[6]  Klaus Bremhorst,et al.  A Modified Form of the k-ε Model for Predicting Wall Turbulence , 1981 .

[7]  D. Drew.  Mathematical Modeling of Two-Phase Flow , 1983 .

[8]  J. Lumley,et al.  A First Course in Turbulence , 1972 .

[9]  W. T. Bakker,et al.  NEAR-BOTTOM VELOCITIES IN WAVES WITH A CURRENT , 1978 .

[10]  R. Simons,et al.  The interaction between waves and a turbulent current: waves propagating with the current , 1982, Journal of Fluid Mechanics.

[11]  Robert J. Moffat,et al.  Structure of transitionally rough and fully rough turbulent boundary layers , 1986, Journal of Fluid Mechanics.

[12]  G. Weatherly,et al.  Some effects of suspended sediment stratification on an oceanic bottom boundary layer , 1981 .

[13]  B. Johns.  Chapter 3 Turbulence Modelling Beneath Waves Over Beaches , 1983 .

[14]  O. Madsen,et al.  The continental-shelf bottom boundary layer , 1986 .

[15]  F. Pourahmadi,et al.  Modelling solid-fluid turbulent flows with application to predicting erosive wear , 1983 .

[16]  Jørgen Fredsøe,et al.  A Sediment Transport Model for Straight Alluvial Channels , 1976 .

[17]  Ivar G. Jonsson,et al.  EXPERIMENTAL AND THEORETICAL INVESTIGATIONS IN AN OSCILLATORY TURBULENT BOUNDARY LAYER , 1976 .

[18]  I. Brevik,et al.  Flume experiment on waves and currents. I. Rippled bed , 1979 .

[19]  J. L. Lumley,et al.  Two-phase and non-Newtonian flows , 1975 .

[20]  D. A. Drew.  Production and Dissipation of Energy in the Turbulent Flow of a Particle-Fluid Mixture, With Some Results on Drag Reduction , 1976 .