Labyrinth spillways are almost as old as dam engineering. In
spite of the fact that they appear as a very good
technical-economical compromise, only 0.1% of large dams are
equipped with such weirs. The main reason for this is that
traditional labyrinth weirs usually cannot be installed on top of
concrete gravity dams as they require a large foundation surface.
In 2003 an improved concept of traditional labyrinth spillway
emerged, with alveoli developed in overhangs from a reduced support
area: the Piano Key Weir (PKW). The Piano Key Weir is a weir of
particular geometry, associating to a labyrinth shape the use of
overhangs to reduce the basis length. The main advantage of Piano
Key Weirs is that it can be directly placed on a dam crest. As a
result of extreme fl oods in the recent past, a growing demand for
safety in society, and revised hydrological calculations, the need
for reliable spillways has consequently become higher. In this
context, the Piano Key Weir proves to be an interesting solution to
increase the hydraulic capacity of spillway devices.
The book contains the state-of-the-art on this still
non-conventional hydraulic structure, and is divided into six main
themes:
- Physical Modeling. Hydraulic capacity
- Physical Modeling. Downstream fittings
- Numerical Modeling
- Hydraulic Design
- Planned and achieved projects
- Nomenclature, Database, Future developments.
The papers in Labyrinth and Piano Key Weirs demonstrate that dam
engineering currently experiences a strong revival of labyrinth
oriented weirs, and are particularly of interest to academia,
researchers and professionals working in the area of hydraulic
engineering, and to dam control authorities and dam owners.
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