Improving spillway discharge safety at Bergeforsen
2011 (English)Conference paper (Refereed)
Bergeforsen is a 35 m high embankment dam. The technical discharge capacity of the existing spillway is 2300 m3/s at full reservoir retention level (FRRL). To meet new design flood criteria a first major rehabilitation was carried out 2003, which allowed discharge of an extreme flood at a water level higher than the FRRL. Recent underwater inspections of the spillway and energy converter have however revealed a need for rehabilitation and adaptation of the concrete structures to the design flood flow conditions. To make it possible to take the spillway out of operation for the time period required for adequate repairs it has been decided to rebuild the dam, adding an alternative spillway structure that will serve as discharge facility during the upgrade of the existing spillway. For this reason, a new 25-m gated spillway, with a stilling basin followed by a curved tunnel section, will be constructed in the left river bank. Once the existing spillway is rehabilitated the combined discharge capacity will make it possible to safely pass the revised design flood at a reservoir level not exceeding the FRRL. A physical model was built to asssit in the design decision, the purpose of which is to verify and optimize engineering solutions for increased discharge capacity, so that the design flood is released without jeopardizing the stuctural integrity of the dam.
Place, publisher, year, edition, pages
IdentifiersURN: urn:nbn:se:kth:diva-179767OAI: oai:DiVA.org:kth-179767DiVA: diva2:889422
Int. Symp. Modern Technologies & Long-term Behavior of Dams, Sept 2011, Zhengzhou, China
QC 201601072015-12-242015-12-242016-01-07Bibliographically approved