Morphological Changes induced by River Training Structures: Bandal-like structures and Groins

Synopsis This paper is focused on the investigation of the characteristics of flow patterns and bed deformation around river training structures like groins with emphasis on the so-called bandal-like structures. Through laboratory experiments and numerical simulations, the complex sediment transport mechanism influenced by bandal-like structures is clarified. The experimental studies were conducted in a straight flume with two structures positioned on one side of channel for the measurements of the velocity field and deformed bed level near the structures under lived-bed scour condition. A morphological model based on unstructured meshes was developed to simulate the flow patterns and bed variation around the structures, which solves the RANS (Reynolds-averaged Navier Stokes) equations for 3D flow calculation with the standard k-e model for turbulence closure, and the sediment transport calculation considering the bed load transport rate through the mass-balance equation. The experimental and numerical results for flow velocity distributions and deformed bed level around the structures field were analyzed and the applicability of bandal-like structures as a low cost alternative method compared to the conventional structures as groins is discussed.

[1]  R. Garde,et al.  Study of Scour Around Spur-Dikes , 1961 .

[2]  Hajime Nakagawa,et al.  Numerical simulation of flow and local scour around hydraulic structures , 2006 .

[3]  Mushtaq Ahmad.  Experiments On Design And Behavior Of Spur Dikes , 1953 .

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

[5]  Abdul Karim Barbhuiya,et al.  Local scour at abutments: A review , 2004 .

[6]  S. Maeno,et al.  INFLUENCE OF THE SPUR DIKE PERMEABILITY ON FLOW AND SCOURING DURING A SURGE PASS , 2003 .

[7]  B. Melville.  Local Scour at Bridge Abutments , 1992 .

[8]  L. Rijn,et al.  Mathematical modelling of morphological processes in the case of suspended sediment transport , 1987 .

[9]  Takashi Hosoda,et al.  NUMERICAL SIMULATION ON LOCAL SCOURING AROUND A SPUR DIKE USING EQUILIBRIUM AND NON-EQUILIBRIUM SEDIMENT TRANSPORT MODELS , 2007 .

[10]  Carlos V. Alonso,et al.  GEOMETRY OF SCOUR HOLES ASSOCIATED WITH 90 DEGREE SPUR DIKES. TECHNICAL NOTE , 1999 .

[11]  T. Ishigaki,et al.  LOCAL SCOUR INDUCED BY 3D FLOW AROUND ATTRACTING AND DEFLECTING GROINS , 2004 .

[12]  Wolfgang Rodi,et al.  Calculation of flow and pollutant dispersion in meandering channels , 1985, Journal of Fluid Mechanics.

[13]  Masanori Michiue,et al.  MOVABLE BED SCOUR AROUND SUBMERGED SPUR-DIKES , 2001 .

[14]  Peng Jing,et al.  Numerical Modeling of Local Scour around Spur Dikes , 2002 .

[15]  Masanori Michiue,et al.  EXPERIMENTAL STUDY OF FLOW BEHAVIOR AROUND SUBMERGED SPUR-DIKE ON RIGID BED , 2000 .

[16]  F. D. Shields,et al.  Local Scour Associated with Angled Spur Dikes , 2002 .

[17]  W. Rodi,et al.  3D NUMERICAL MODELING OF FLOW AND SEDIMENT TRANSPORT IN OPEN CHANNELS , 2000 .

[18]  Tadaoki Itakura,et al.  Open Channel Flow with Suspended Sediments , 1980 .

[19]  N. Surian,et al.  Morphological response to river engineering and management in alluvial channels in Italy , 2003 .

[20]  A. Tominaga,et al.  Diverse riverbed figuration by using skew spur-dike groups , 2006 .

[21]  F. D. Shields,et al.  Design for Stream Restoration , 2003 .

[22]  Abdul,et al.  VORTEX FLOW FIELD IN A SCOUR HOLE AROUND ABUTMENTS , 2003 .

[23]  T. Hosoda,et al.  Three-Dimensional Numerical Model for Flow and Bed Deformation around River Hydraulic Structures , 2005 .

[24]  U. C. Kothyari,et al.  Scour around spur dikes and bridge abutments , 2001 .

[25]  M. A. Gill.  Erosion of Sand Beds around Spur Dikes , 1972 .

[26]  Anton Kruger,et al.  Large-scale particle image velocimetry for flow analysis in hydraulic engineering applications , 1998 .

[27]  Nallamuthu Rajaratnam,et al.  EROSION NEAR GROYNE-LIKE STRUCTURES , 1983 .

[28]  F. Douglas Shields,et al.  Experiment in Stream Restoration , 1995 .

[29]  H. Einstein,et al.  The Bed-Load Function for Sediment Transportation in Open Channel Flows , 1950 .

[30]  Nallamuthu Rajaratnam,et al.  Flow Near Groin‐Like Structures , 1983 .

[31]  H. Kozerski,et al.  Entry and Deposits of Suspended Particulate Matter in Groyne Fields of the Middle Elbe and its Ecological Relevance , 2003 .

[32]  T F Kwan,et al.  A STUDY OF ABUTMENT SCOUR , 1988 .

[33]  Abdul Karim Barbhuiya,et al.  Velocity and turbulence in a scour hole at a vertical-wall abutment , 2006 .

[34]  Hajime Nakagawa,et al.  On the Formation of Stable River Course , 2004 .

[35]  Hajime Nakagawa,et al.  PREDICTION OF LOCAL SCOUR DEPTH AROUND BANDAL-LIKE STRUCTURES , 2006 .

[36]  Hao Zhang,et al.  Study on Flow and Bed Evolution in Channels with Spur Dykes , 2005 .

[37]  W. Uijttewaal.  Effects of Groyne Layout on the Flow in Groyne Fields: Laboratory Experiments , 2005 .

[38]  Bruce W. Melville,et al.  Local scour and flow measurements at bridge abutments , 1994 .