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Basic Research: Wave-ripple Bedforms

Primary investigators: Yovanni Catano and Marcelo H. García.

Abstract

Scour pattern around cylinder.

The study is being conducted at the Hydrosystems Laboratory of the University of Illinois at Urbana-Champaign, and comprises an examination of the interaction between a finite cylinder and a movable sand bed influenced by waves and co-existing flow.

Experiments are being carried out in a tilting water flume of 49 m (161 ft) in length, 1.83 m (6 ft) wide, and 1.22 m (4 ft) deep; the slope of the flume for the current experiments is S = 0. The flume is constructed of a steel floor and Plexiglas sidewalls through out the phenomena can be observed. The current was achieved by recirculation of water in the flume. Mostly regular waves were generated by a piston type wavemaker. The generator consists of a flat, vertical steel plate equipped with wooden wipers to prevent leakage around the plate. The wave generator is driven by a hydraulic ram that is capable of producing either periodic or random motion of the plate.

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Cylinder propogation under the influence of waves only.

Keywords

bedforms; combined flow; ripples; sediment transport; sandwaves; spectral analysis; shallow waters; burial of cylinders; burial; cylinder; scour; scour around objects; sediment dynamics