Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR026032 |
The Effect of Biofilms on Turbulent Flow over Permeable Beds | |
Farzan Kazemifar; Gianluca Blois; Marcelo Aybar; Patricia Perez Calleja; Robert Nerenberg; Sumit Sinha; Richard J. Hardy; Jim Best; Gregory H. Sambrook Smith; Kenneth T. Christensen | |
2020-12-14 | |
发表期刊 | Water Resources Research |
出版年 | 2020 |
英文摘要 | Despite an increasingly large body of work advancing our understanding of flow interactions occurring at the interface of a turbulent flow overlying a permeable bed, little is known concerning how such flow may be affected by the presence of biofilms, which exist in nearly all aquatic environments. This paper quantifies the effects on flow exerted by biofilms grown over experimental laboratory permeable beds until biofilm detachment, and then compares this to the residual effects after its detachment. The investigation is conducted in a flow channel by immersing two‐dimensional permeable beds with idealized geometry and different porosities in order to explore different bed permeabilities. Sequences of increasingly higher flow velocity conditions followed by lower flow, were considered to explore the effect of detachment. Measurements were performed using particle image velocimetry. The total wall shear stress and friction velocity were found to increase in the presence of pre‐grown biofilm, and decrease after biofilm detachment, when compared at the same pump frequency. The dimensionless Reynolds stresses, at constant pump frequency, collapsed for different bed configurations in the outer layer, while for the inner layer, the presence of biofilm led to a decrease in dimensionless Reynolds stress. Quadrant analysis shows that this decrease was primarily due to a reduction in strong Q2 contributions. These results suggest that models for flow and transport over permeable media in aquatic environments cannot neglect the role of biofilms in modifying turbulence. This article is protected by copyright. All rights reserved. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/308230 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Farzan Kazemifar,Gianluca Blois,Marcelo Aybar,et al. The Effect of Biofilms on Turbulent Flow over Permeable Beds[J]. Water Resources Research,2020. |
APA | Farzan Kazemifar.,Gianluca Blois.,Marcelo Aybar.,Patricia Perez Calleja.,Robert Nerenberg.,...&Kenneth T. Christensen.(2020).The Effect of Biofilms on Turbulent Flow over Permeable Beds.Water Resources Research. |
MLA | Farzan Kazemifar,et al."The Effect of Biofilms on Turbulent Flow over Permeable Beds".Water Resources Research (2020). |
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