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dc.contributor.author
Fuchs, Helge
dc.date.accessioned
2018-04-09T13:35:52Z
dc.date.available
2018-04-09T13:08:10Z
dc.date.available
2018-04-09T13:35:52Z
dc.date.issued
2017
dc.identifier.uri
http://hdl.handle.net/20.500.11850/256475
dc.identifier.doi
10.3929/ethz-b-000256475
dc.description.abstract
Surfing is a popular water sport in regions with ocean access. In countries without ocean access, standing river waves occurring in flood situations are often employed for surfing. The hydraulic conditions involving high flow velocities and large recirculation zones then impose a risk of injury to the surfers. As an alternative, artificial surf wave conditions are provided at a number of river locations in Europe and worldwide. In most locations, a wave-type hydraulic jump is generated at a bottom drop. Based on the experiences with those engineered surf waves, adjustable installations demonstrate a positive effect on the surf wave characteristics. Physical laboratory experiments were conducted to quantify the effect of adjustable flaps on the generated wave characteristics at abrupt bottom drops. Whereas the wave-jump at a plain bottom drop without flap is very sensitive to the tailwater flow depth, adjustable flaps prevent the change of flow type from the favored wave-jump to non-surfable conditions for a wider range of downstream flow depths. Depending on the approach flow conditions, flaps significantly increase the wave height. However, adjustable flaps may also implicate additional limitations to the parameter range. Flaps with a small angle led to a wave height reduction, as compared to the plain bottom drop without flap. This paper details the above descriptions, and selected wave-type flow features are discussed. The research thus contributes to the general process understanding of surfable river waves and safer surf conditions, as compared to the common use of standing waves in rivers at flood situations.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
International Association for Hydro-Environment Engineering and Research (IAHR)
en_US
dc.rights.uri
http://rightsstatements.org/page/InC-NC/1.0/
dc.title
Effect of adjustable flaps on river surf waves at abrupt drops
en_US
dc.type
Conference Paper
dc.rights.license
In Copyright - Non-Commercial Use Permitted
ethz.book.title
E-proceedings of the 37th IAHR World Congress
en_US
ethz.size
7 p.
en_US
ethz.version.deposit
acceptedVersion
en_US
ethz.event
37th IAHR World Congress
en_US
ethz.event.location
Kuala Lumpur, Malaysia
en_US
ethz.event.date
August 13-18, 2017
en_US
ethz.publication.place
S.l.
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02611 - V. Wasserbau, Hydrologie u. Glaziologie / Lab. Hydraulics,Hydrology,Glaciology
en_US
ethz.relation.isReferencedBy
handle/20.500.11850/185327
ethz.date.deposited
2018-04-09T13:08:11Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2018-04-09T13:36:01Z
ethz.rosetta.lastUpdated
2018-11-06T17:36:07Z
ethz.rosetta.versionExported
true
ethz.COinS
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