Difference between revisions of "Analytical models for bar patterns and braiding threshold"
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Blondeaux P. and Seminara G. (1983): Bed topography and instabilities in sinuous channels. In: River Meandering, Proc. Conf. Rivers 1983, New Orleans, Ed. C.M. Elliott, ASCE, 1984, pp.747-758. | Blondeaux P. and Seminara G. (1983): Bed topography and instabilities in sinuous channels. In: River Meandering, Proc. Conf. Rivers 1983, New Orleans, Ed. C.M. Elliott, ASCE, 1984, pp.747-758. | ||
| − | Colombini M., Seminara G., Tubino M. (1987): Finite-amplitude alternate bars. J. Fluid Mech., | + | Colombini M., Seminara G., Tubino M. (1987): Finite-amplitude alternate bars. J. Fluid Mech., 181, pp.213-232. |
| + | http://dx.doi.org/10.1017/S0022112087002064 | ||
| − | Crosato A. and Mosselman E. (2009): Simple physics-based predictor for the number of river bars and the transition between meandering and braiding, Water Resources Res., AGU, 45, W03424 | + | Crosato A. and Mosselman E. (2009): Simple physics-based predictor for the number of river bars and the transition between meandering and braiding, Water Resources Res., AGU, 45, W03424. |
| + | http://onlinelibrary.wiley.com/doi/10.1029/2008WR007242/abstract | ||
| − | Struiksma N., Olesen K.W., Flokstra C., de Vriend H.J. (1985): Bed deformation in curved alluvial channels. J. Hydr. Res., IAHR, | + | Struiksma N., Olesen K.W., Flokstra C., de Vriend H.J. (1985): Bed deformation in curved alluvial channels. J. Hydr. Res., IAHR, 23, (1), pp.57-79. |
| + | http://www.tandfonline.com/doi/abs/10.1080/00221688509499377#.UZN6d8pIXoY | ||
===Sample applications=== | ===Sample applications=== | ||
Latest revision as of 14:07, 15 May 2013
Analytical models for bar patterns and braiding threshold
Type
Hydromorphological models
Basic principles
Linearized fundamental equations for conservation of water mass and water flow momentum, time-averaged over all turbulent fluctuations, spatially averaged over water depth (2DH) or nor spatially averaged (3D). Linearized parameterized relation for effect of helical flow on bed shear stress direction. Linearized equilibrium sediment transport predictor or advection-relaxation equation for sediment transport. Linearized empirical relation for effect of sloping beds on sediment transport magnitude and direction. Linearized Exner equation for conservation of sediment mass.
Outputs
Number of bars per cross-section, bar length, bar stability.
Rivertypes
Related Pressures
- Surface water abstraction
- Groundwater abstractions
- Alteration of instream habitat
- Sand and gravel extraction
- Sedimentation and sediment input
- Embankments, levees or dikes
- Loss of vertical connectivity
- Impoundment
- Alteration of riparian vegetation
- Channelisation / cross section alteration
Related Measures
- Improve/Create water storage
- Reduce water consumption
- Increase minimum flows
- Recycle used water
- Improve water retention
- Reduce surface water abstraction with return
- Water diversion and transfer
- Reduce surface water abstraction without return
- Reduce groundwater extraction
- Create low flow channels in over-sized channels
- Narrow water courses
- Widen water courses
- Allow/increase lateral channel migration or river mobility
- Remeander water courses
- Shallow water courses
Useful references
Selected software systems
REGMEANDER
Theoretical background
Blondeaux P. and Seminara G. (1983): Bed topography and instabilities in sinuous channels. In: River Meandering, Proc. Conf. Rivers 1983, New Orleans, Ed. C.M. Elliott, ASCE, 1984, pp.747-758.
Colombini M., Seminara G., Tubino M. (1987): Finite-amplitude alternate bars. J. Fluid Mech., 181, pp.213-232. http://dx.doi.org/10.1017/S0022112087002064
Crosato A. and Mosselman E. (2009): Simple physics-based predictor for the number of river bars and the transition between meandering and braiding, Water Resources Res., AGU, 45, W03424. http://onlinelibrary.wiley.com/doi/10.1029/2008WR007242/abstract
Struiksma N., Olesen K.W., Flokstra C., de Vriend H.J. (1985): Bed deformation in curved alluvial channels. J. Hydr. Res., IAHR, 23, (1), pp.57-79. http://www.tandfonline.com/doi/abs/10.1080/00221688509499377#.UZN6d8pIXoY
