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Laboratory measurements of flow and turbulence in discontinuous distributions of ligulate seagrass.

Maltese, Antonino and Cox, Eleanor and Folkard, Andrew M. and Ciraolo, Giuseppe (2007) Laboratory measurements of flow and turbulence in discontinuous distributions of ligulate seagrass. Journal of Hydraulic Engineering, 133 (7). pp. 750-760. ISSN 0733-9429

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Abstract

Turbulent flow characteristics were investigated in laboratory flume studies of a ligulate plant canopy interrupted by a gap representing discontinuities observed in seagrass prairies. The reliability of velocity measurements obtained using an acoustic Doppler velocimeter within the canopy was shown using specifically designed experiments. In relatively fast flow (mean velocity 5.5 cm s−1), the mean flow profile was logarithmic above the canopy, had an inflection point near its top, and uniformly low values within it. Within the gap, a recirculation cell formed. Reynolds stress maxima were approximately coincident with the mean flow inflection point. Quadrant analysis revealed an ejection-dominated upper layer, a sweep-dominated region around the top of the canopy and within the gap, and no dominant quadrant within the canopy. In slower flow (mean velocity 1.7 cm s−1) the plants were quasiemergent and the flow fields more uniform. Sweeps similarly dominated the region near the top of the canopy and within the gap. In both flows, autocorrelation of longitudinal velocity fluctuations showed a Lagrangian time scale maximum at the downstream end of the gap.

Item Type: Article
Journal or Publication Title: Journal of Hydraulic Engineering
Additional Information: AF's roles: formulated the idea, co-led the discussion and interpretation of results, wrote a significant portion of text. RAE_import_type : Journal article RAE_uoa_type : Earth Systems and Environmental Sciences
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 2176
Deposited By: ep_importer
Deposited On: 07 Apr 2008 14:05
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:51
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/2176

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