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J. Mar. Sci. Eng. 2015, 3(3), 821-844;

Long Wave Flow Interaction with a Single Square Structure on a Sloping Beach

Coastal Research Station, Lower Saxony Water Management, Coastal Defense and Nature Conservation Agency, An der Mühle 5, Norderney D-26548, Germany
Franzius-Institute for Hydraulic, Estuarine and Coastal Engineering, Leibniz University Hannover, Nienburger Straße 4, Hannover D-30167, Germany
Department of Civil Engineering, University of Ottawa, 161 Louis Pasteur, Ottawa, ON K1N 6N5, Canada
Author to whom correspondence should be addressed.
Academic Editor: Valentin Heller
Received: 21 June 2015 / Accepted: 29 July 2015 / Published: 5 August 2015
(This article belongs to the Special Issue Tsunami Science and Engineering)
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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. View Full-Text
Keywords: tsunami on land flow; flow-structure interaction; vortex shedding; drag force; inertia force tsunami on land flow; flow-structure interaction; vortex shedding; drag force; inertia force

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Bremm, G.C.; Goseberg, N.; Schlurmann, T.; Nistor, I. Long Wave Flow Interaction with a Single Square Structure on a Sloping Beach. J. Mar. Sci. Eng. 2015, 3, 821-844.

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