Long wave flow interaction with a single square structure on a sloping beach

Research output: Contribution to journalArticleResearchpeer review

Authors

  • Gian C. Bremm
  • Nils Goseberg
  • Torsten Schlurmann
  • Ioan Nistor

External Research Organisations

  • Coastal Defence and Nature Conservation Agency (NLWKN)
  • University of Ottawa
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Details

Original languageEnglish
Pages (from-to)821-844
Number of pages24
JournalJournal of Marine Science and Engineering
Volume3
Issue number3
Publication statusPublished - 5 Aug 2015

Abstract

In the context of dam breaks, tsunami, and flash floods, it is paramount to quantify the time-history of forces by the rapidly transient flow to vertical structures and the characteristics of the induced flow patterns. To resemble on-land tsunami-induced flow, a free-surface-piercing structure is exposed to long leading depression waves in a tsunami flume where long waves run up and down a 1:40 smooth and impermeable sloping beach after its generation by a volume-driven wave maker. The structure and its surrounding were monitored with force transducers, pressure gauges and cameras. Preparatory steady-state experiments were accomplished to determine the drag force coefficient of the square cylinder at various water depths. The flow during wave run-up and draw-down acting on the structure resulted in distinct flow pattern which were characteristic for the type of flow-structure interaction. Besides bow wave propagating upstream, a standing or partially-standing wave was observed in front of the structure together with a wake formation downstream, while a von Kármán vortex street developed during the deceleration phase of the flow motion and during draw-down. Force measurements indicated a sudden increase in the stream-wise total force starting with the arrival of the flow front during initial run-up. Lateral velocities showed significant oscillations in correlation with the von Kármán vortex street development. A comparison of the total measured base force with the analytically-calculated share of the drag force revealed that forces were prevailingly drag-dominated.

ASJC Scopus subject areas

Cite this

Long wave flow interaction with a single square structure on a sloping beach. / Bremm, Gian C.; Goseberg, Nils; Schlurmann, Torsten et al.
In: Journal of Marine Science and Engineering, Vol. 3, No. 3, 05.08.2015, p. 821-844.

Research output: Contribution to journalArticleResearchpeer review

Bremm, GC, Goseberg, N, Schlurmann, T & Nistor, I 2015, 'Long wave flow interaction with a single square structure on a sloping beach', Journal of Marine Science and Engineering, vol. 3, no. 3, pp. 821-844. https://doi.org/10.3390/jmse3030821, https://doi.org/10.3390/jmse3030821
Bremm, G. C., Goseberg, N., Schlurmann, T., & Nistor, I. (2015). Long wave flow interaction with a single square structure on a sloping beach. Journal of Marine Science and Engineering, 3(3), 821-844. https://doi.org/10.3390/jmse3030821, https://doi.org/10.3390/jmse3030821
Bremm GC, Goseberg N, Schlurmann T, Nistor I. Long wave flow interaction with a single square structure on a sloping beach. Journal of Marine Science and Engineering. 2015 Aug 5;3(3):821-844. doi: 10.3390/jmse3030821, 10.3390/jmse3030821
Bremm, Gian C. ; Goseberg, Nils ; Schlurmann, Torsten et al. / Long wave flow interaction with a single square structure on a sloping beach. In: Journal of Marine Science and Engineering. 2015 ; Vol. 3, No. 3. pp. 821-844.
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