Iowa Vanes
In the field of water regulation, Iowa Vanes ("vane" = English for wing, baffle) represent an alternative to groynes and sheet piling for bank reinforcement.
Professor A. Jacob Odgaard of the University of Iowa first introduced it in 1984 on the East Nishnabotna River and the West Fork Cedar River to prevent erosion and river bed displacement in the area of highway bridges.
functionality
Fields of guide walls (so-called vanes ) are created on the outer bank of a river bend. They stand vertically and are rotated approx. 10 to 25 ° outwards from the undisturbed flow direction. In the event of a flood, the water flows over them and creates a secondary flow due to the diversion close to the ground . This directs the bedload flow to the outer bank. The main streamline shifts to the inside. The consequence is a deposit of debris on the erosion-prone outer flank of the water. The Vanes sometimes become part of the rubble bank.
Construction methods
All construction methods of technical hydraulic engineering that are sufficiently anchored in the ground are suitable in principle:
- Sheet piling
- Concrete body on pile foundation
- Wooden sleepers between steel profiles
credentials
See also
Web links
- Iowa vanes fact sheet
- Iowa vanes , PDF file