Chapter
Apr 26, 2012
Stability Analysis in Stream Restoration
Publication: World Environmental and Water Resources Congress 2008: Ahupua'A
Abstract
A perturbation stability analysis is used for development of a stable-channel alignment. By introducing a small perturbation into the equations governing flow and sediment transport and analyzing the growth rate of the perturbation, the analysis leads to the `dominant' channel-wavelength and the channel alignment that has the greatest stability. A channel with such alignment will be the least destructive in terms of bank erosion and migration, and it will be a channel with minimal maintenance requirements. Graphs are developed that describe the dominant meander wavelength and phase shift as a function of primary flow and sediment variables. A numerical example is provided showing how the graphs are used to determine the optimum channel alignment given flow and sediment characteristics. Two channel stabilization projects are also described that benefitted from the stability analysis.
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Copyright
© 2008 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
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ASCE Technical Topics:
- Alignment
- Channel stabilization
- Channels (waterway)
- Design (by type)
- Ecological restoration
- Ecosystems
- Engineering fundamentals
- Environmental engineering
- Geometrics
- Highway and road design
- Hydraulic engineering
- Hydraulic structures
- River bank stabilization
- River engineering
- Rivers and streams
- Sediment
- Sediment transport
- Water and water resources
- Waterways
Authors
Affiliations
IIHR-Hydroscience and Engineering, University or Iowa, Iowa City, IA 52242. E-mail: [email protected]
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.