Vatnsfell dam, Iceland – experimental study of flood discharge structures.
2006 (English)Conference paper (Refereed)
The main dam of Vatnsfell hydroelectric scheme is a 30 m high rock-fill dam with concrete slab facing. The design adopts a bottom spillway and a so-called converging overfall spillway. They share a energy dissipation structure of the type spatial stilling basin. Hydraulic model studies are made to evaluate and optimize the hydraulic behavior of the converging spillway, the bottom spillway and the common stilling basin. The layout offers a unique combination of interesting hydraulic features. A cover is suggested on the converging spillway chute to suppress the cross-wave. A splitter wall, centrally placed under the cover, is used to achieve uniform approach flow to the stilling basin. The basin is modified in terms of baffle-block layout and location of the end sill and side-walls. The energy dissipation should behave satisfactorily no matter when the overfall spillway and the bottom outlet are used separately or simultaneously. Other aspects examined include the spillway discharge capacity, water-surface profile in the chute, water pressure on the chute and side-walls, forces on the baffles and end sill, risk for erosion downstream the rip-rap and the behaviour of hydraulic jump at the radial gate.
Place, publisher, year, edition, pages
Vafnsfell dam, flood duscharge structure, spillway, model tests
IdentifiersURN: urn:nbn:se:kth:diva-179788OAI: oai:DiVA.org:kth-179788DiVA: diva2:889453
HYDRO 2006, Sept 2006, Porto Carras, Greece
QC 2016010172015-12-252015-12-252016-01-07Bibliographically approved