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Making water flow: a comparison of the hydrodynamic characteristics of 12 different benthic biological flumes

Jonsson, P.R. and Van Duren, L.A. and Amielh, M. and Asmus, R. and Aspden, R.J. and Daunys, D. and Friedrichs, M. and Friend, P.L. and Olivier, F. and Pope, N. and Precht, E. and Sauriau, P-G. and Schaaff, E. (2006) Making water flow: a comparison of the hydrodynamic characteristics of 12 different benthic biological flumes. Aquatic Ecology, 40, 409-438. ISSN 1386-2588.

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Official URL: http://dx.doi.org/10.1007/s10452-006-9049-z

Abstract

Flume tanks are becoming increasingly important research tools in aquatic ecology, to link biological to hydrodynamical processes. There is no such thing as a “standard flume tank”, and no flume tank is suitable for every type of research question. A series of experiments has been carried out to characterise and compare the hydrodynamic characteristics of 12 different flume tanks that are designed specifically for biological research. These facilities are part of the EU network BioFlow. The flumes could be divided into four basic design types: straight, racetrack, annular and field flumes. In each facility, two vertical velocity profiles were measured: one at 0.05 m s−1 and one at 0.25 m s−1. In those flumes equipped with Acoustic Doppler Velocimeters (ADV), time series were also recorded for each velocity at two heights above the bottom: 0.05 m and 20% of the water depth. From these measurements turbulence characteristics, such as TKE and Reynolds stress, were derived, and autocorrelation spectra of the horizontal along-stream velocity component were plotted. The flume measurements were compared to two sets of velocity profiles measured in the field. Despite the fact that some flumes were relatively small, turbulence was fully developed in all channels. Straight and racetrack flumes generally produced boundary layers with a clearly definable logarithmic layer, similar to measurements in the field taken under steady flow conditions. The two annular flumes produced relatively thin boundary layers, presumably due to secondary flows developing in the curved channels. The profiles in the field flumes also differed considerably from the expected l [KEYWORDS: Benthic boundary layer ; Biological–Physical interaction ; Flume tanks ; Hydrodynamics - methods]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:11962
Deposited On:23 Nov 2011 01:00
Last Modified:24 Apr 2012 16:31

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