Wind induced waves in narrow irrigation canals

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SUMMARY

This discussion focuses on estimating maximum wave heights generated by wind in narrow irrigation canals, specifically a canal that is 5 meters deep with 1:2 side slopes and a 4.6-meter wide base. The participants are currently applying wave theory for dams and shore protection, which is not directly applicable to narrow water bodies. They seek methodologies to quantify wave height in such confined spaces, acknowledging that wave generation will differ significantly from wider water bodies. The conversation highlights a lack of existing research on this specific topic.

PREREQUISITES
  • Understanding of wave theory as applied to hydraulic engineering
  • Familiarity with irrigation canal design and specifications
  • Knowledge of freeboard calculations for flood prevention
  • Ability to interpret hydraulic design standards and research papers
NEXT STEPS
  • Research "wave generation in narrow channels" to find applicable studies
  • Explore "hydraulic modeling software" for simulating wave behavior in confined spaces
  • Investigate "freeboard design criteria" specific to irrigation canals
  • Review the provided studies from the USBR for relevant methodologies
USEFUL FOR

Hydraulic engineers, irrigation system designers, and researchers focused on water management and wave dynamics in confined water bodies will benefit from this discussion.

Philip_Crawfor
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Hi,

We are trying to estimate the likely maximum wave generated from wind blowing along an irrigation canal. We will subsequently estimate runup and the required freeboard to prevent overtopping.

Our canal is ~ 5m deep, has 1:2 side-slopes and a 4.6m wide base. The canal is aligned with the prevalent wind for ~8 km but within this reach there are a number of significant kinks.

Currently we are using wave theory for dams / shore protection but these assume wide water bodies. Does anyone know how to quantify the wave height for a narrow canal? I would assume wave generation to be considerably less for a water body that is narrow like a canal.

We are unable to find any research on this topic. Any advice would be greatly appreciated.
 
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