Dynamic reconfiguration of aquatic plants and its interrelations with upstream turbulence and drag forces

Fabio Siniscalchi, Vladimir Nikora

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

This article explores the interrelations between flow, fluctuating drag forces, and dynamic reconfiguration experienced by four freshwater plant species in response to turbulent open-channel flow. The study is based on experiments conducted in a laboratory flume using single specimens of Ranunculus penicillatus, Fontinalis antipyretica, Myriophyllum alterniflorum, and Callitriche stagnalis. A significant correlation between drag fluctuations, plant movements, and upstream turbulence was found. The data also revealed that the plants in general exhibited spatial flapping-like motion, with the propagation velocity of perturbations along the plant being approximately constant and comparable to the upstream flow velocity. The analysis of statistical moments, spectra, cross-correlations, and coherence functions provided strong support to the conclusion that the dynamic reconfiguration directly affects the drag force exerted on the plants, in addition to the effect of the upstream turbulence.
Original languageEnglish
Pages (from-to)46-55
Number of pages10
JournalJournal of Hydraulic Research
Volume51
Issue number1
Early online date8 Feb 2013
DOIs
Publication statusPublished - 2013

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aquatic plant
drag
Drag
Turbulence
turbulence
Open channel flow
Flow velocity
open channel flow
flow velocity
perturbation
Experiments
experiment

Keywords

  • aquatic vegetation
  • drag
  • dynamic reconfiguration of plants
  • open-channel flow
  • turbulence

Cite this

Dynamic reconfiguration of aquatic plants and its interrelations with upstream turbulence and drag forces. / Siniscalchi, Fabio; Nikora, Vladimir.

In: Journal of Hydraulic Research, Vol. 51, No. 1, 2013, p. 46-55.

Research output: Contribution to journalArticle

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abstract = "This article explores the interrelations between flow, fluctuating drag forces, and dynamic reconfiguration experienced by four freshwater plant species in response to turbulent open-channel flow. The study is based on experiments conducted in a laboratory flume using single specimens of Ranunculus penicillatus, Fontinalis antipyretica, Myriophyllum alterniflorum, and Callitriche stagnalis. A significant correlation between drag fluctuations, plant movements, and upstream turbulence was found. The data also revealed that the plants in general exhibited spatial flapping-like motion, with the propagation velocity of perturbations along the plant being approximately constant and comparable to the upstream flow velocity. The analysis of statistical moments, spectra, cross-correlations, and coherence functions provided strong support to the conclusion that the dynamic reconfiguration directly affects the drag force exerted on the plants, in addition to the effect of the upstream turbulence.",
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AB - This article explores the interrelations between flow, fluctuating drag forces, and dynamic reconfiguration experienced by four freshwater plant species in response to turbulent open-channel flow. The study is based on experiments conducted in a laboratory flume using single specimens of Ranunculus penicillatus, Fontinalis antipyretica, Myriophyllum alterniflorum, and Callitriche stagnalis. A significant correlation between drag fluctuations, plant movements, and upstream turbulence was found. The data also revealed that the plants in general exhibited spatial flapping-like motion, with the propagation velocity of perturbations along the plant being approximately constant and comparable to the upstream flow velocity. The analysis of statistical moments, spectra, cross-correlations, and coherence functions provided strong support to the conclusion that the dynamic reconfiguration directly affects the drag force exerted on the plants, in addition to the effect of the upstream turbulence.

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