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Water 2014, 6(8), 2164-2174; doi:10.3390/w6082164
Article

The Effects of Surface Debris Diversion Devices on River Hydrodynamic Conditions and Implications for In-Stream Hydrokinetic Development

Civil and Environmental Engineering Department, University of Alaska Fairbanks, P.O. Box 755900, Fairbanks, AK 99775, USA
Received: 19 March 2014 / Revised: 21 June 2014 / Accepted: 16 July 2014 / Published: 24 July 2014
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Abstract

Floating objects designed to divert woody debris—known as debris diversion devices—can protect hydrokinetic turbines deployed in rivers; they also change the hydrodynamic conditions of a river, at least locally. Modifications associated with velocity adjustments in both magnitude and direction would be expected. Thus, one could assume that extra macro-turbulent levels would be found immediately behind a device and downstream of that location. This article presents a set of cross-sectional and longitudinal velocity measurements carried out to quantify these effects. Results show important changes in the velocity components. In addition, significant changes in the vorticity field, calculated along cross-sectional profiles, demonstrate the role of a submerged chain used to maintain the debris diversion device in place. More importantly, findings suggest that hydrokinetic turbines should not be installed in a river’s central area behind a debris diversion device, due to the additional turbulence created by the submerged chain.
Keywords: surface woody debris; debris diversion devices; vorticity; hydrokinetics; river hydrodynamics; macro-turbulence surface woody debris; debris diversion devices; vorticity; hydrokinetics; river hydrodynamics; macro-turbulence
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Toniolo, H. The Effects of Surface Debris Diversion Devices on River Hydrodynamic Conditions and Implications for In-Stream Hydrokinetic Development. Water 2014, 6, 2164-2174.

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