Case Study: Turbulent Flow and Sediment Distributions in a Groyne Field

This study presents measurements and analysis of three-dimensional turbulent flow structure and characteristics of suspended particulate matter distribution. Measurements of velocity vectors provided accurate mapping of the flow pattern inside the groyne field. Although the velocity distributions reveal the validity of the power law for depth range 0.1<\Iz/h\N<0.5, the reduction of velocity magnitude to zero value was observed near the flow free surface. The turbulent kinetic energy distributions follow the slope of the semitheoretical description at 0.1<\Iz/h\N<0.5 and increase at the upper flow layers. The composition of the suspended material changes substantially throughout the groyne field area due to the replacement of nonorganic compounds by organic compounds. The effect of ship-induced currents is shown to be responsible for the rise of suspended sediment concentration up to 17% in comparison with undisturbed conditions and changes in the composition of the suspended material.

[1]  V. Nikora,et al.  Structure of River Turbulence behind Warm‐Water Discharge , 1994 .

[2]  I. Kimura,et al.  Fundamental properties of flows in open channels with dead zone , 1997 .

[3]  M. Thiele,et al.  Turbulence structure in a river reach with sand bed , 1998 .

[4]  Ramon Cabrera,et al.  New Acoustic Meter for Measuring 3D Laboratory Flows , 1994 .

[5]  Alexander N. Sukhodolov,et al.  Experimental and numerical validation of the dead-zone model for longitudinal dispersion in rivers , 1998 .

[6]  A. Hildrew.  Whole river ecology: spatial scale and heterogeneity in the ecology of running waters , 1996 .

[7]  J. Kirby.  Rational approximations in the parabolic equation method for water waves , 1986 .

[8]  Wim S. J. Uijttewaal,et al.  Exchange Processes between a River and Its Groyne Fields: Model Experiments , 2001 .

[9]  E. Tipping,et al.  Deposition and resuspension of fine particles in a riverine ‘dead zone’ , 1993 .

[10]  B. Przedwojski,et al.  Bed topography and local scour in rivers with banks protected by groynes , 1995 .

[11]  Ian R. Wood,et al.  Longitudinal Dispersion with Dead Zones , 1977 .

[12]  Iehisa Nezu,et al.  Turbulence in open-channel flows , 1993 .

[13]  Sam S. Y. Wang,et al.  Verification of a three-dimensional numerical model simulation of the flow in the vicinity of spur dikes , 1995 .

[14]  Tawatchai Tingsanchali,et al.  2‐D Depth‐Averaged Flow Computation near Groyne , 1990 .

[15]  V. Nikora,et al.  ADV Measurements of Turbulence: Can We Improve Their Interpretation? , 1998 .

[16]  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 .

[17]  P. Carling,et al.  River hydraulics, sediment transport and training works : their ecological relevance to European rivers , 1996 .

[18]  Denis Dartus,et al.  THREE-DIMENSIONAL COMPUTATION OF FLOW AROUND GROYNE , 1997 .

[19]  D. G. Watts,et al.  Spectral analysis and its applications , 1968 .