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Modification of flood discharge structure for updated design flood at Letsi dam
Vattenfall R&D.
WSP.
WSP.
Vattenfall AB.
2006 (English)Conference paper (Refereed)
Abstract [en]

In its safety evaluations of the Letsi dam in northern Sweden, a number of safety issues were identified. The main concern was associated with the safe discharge of its updated design flood, which was some 25% higher than that the dam was originally designed for. To adapt the dam to the higher safety standard, the flood discharge structure, consisting of upper spillway channel, plunge pool and canal downstream, had to be modified. To guarantee satisfactory flow behaviors and cost efficiency, the re-shaping of the waterway was optimized through hydraulic model tests. The final refurbishment measures included sidewall heightening of the upper channel, addition of partition wall in its middle, enlargement and deepening of the plunge pool and a new canal downstream with erosion protection. When the rebuilding of the dam was completed, the spillway was tested to release a flood of about 1500 m3/s, followed by visual and diver inspections. From the prototype release, several auxiliary measures were recommended, including some that were tested in the model but not realized at the time of the release.

Place, publisher, year, edition, pages
2006.
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-179789OAI: oai:DiVA.org:kth-179789DiVA: diva2:889454
Conference
Dam Safety 2006, Sept. 2006, Boston, USA
Note

QC 20160107

Available from: 2015-12-25 Created: 2015-12-25 Last updated: 2016-01-07Bibliographically approved

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Yang, James
Civil Engineering

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