0D analytical models for morphology on long time scales

0D analytical models for morphology on long time scales

Type

Hydromorphological models

Basic principles

Fundamental equations for conservation of water mass and water flow momentum under the assumption of steady uniform flow, spatially averaged over cross-section and time-averaged over all turbulent fluctuations. Equilibrium sediment transport predictor. Exner equation for conservation of sediment mass.

Outputs

Flow velocities, water depths, water levels, flow shear stresses. Sediment transport, bed level, erosion, sedimentation.

Rivertypes

• Landscape unit
•    Landscape unit

Related Pressures

• Surface water abstraction
• Groundwater abstractions
• Hydropeaking
• Sediment discharge from dredging
• Reservoir flushing
• Hydrological regime modification
• Interbasin flow transfers
• Discharge diversions and returns
• Colinear connected reservoir
• Artificial barriers downstream from the site
• Artificial barriers upstream from the site
• 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
• Reduce undesired sediment input
• Manage dams for sediment flow
• Reduce erosion
• Add/feed sediment
• Prevent sediment accumulation in reservoirs
• Improve continuity of sediment transport
• Trap sediments
• Facilitate downstream migration
• Manage sluice and weir operation for fish migration
• Remove barrier
• Install fish pass/bypass/side channel for upstream migration
• Modify culverts, syphons, piped streams
• Fish-friendly turbines and pumping stations

Useful references

Theoretical background

Jansen P.Ph., van Bendegom L., van den Berg J., de Vries M., Zanen A. (1979): Principles of river engineering; The non-tidal alluvial river. Pitman, London.

Ribberink J.S. and van der Sande J.T.M. (1985): Aggradation in rivers due to overloading - analytical approaches. J. Hydr. Res., IAHR, 23, (3), pp.273-283. http://www.tandfonline.com/doi/abs/10.1080/00221688509499355#.UZN4fcpIXoY