Effect of biofilm on the rheological properties of cohesive sediment

Effect of biofilm on the rheological properties of cohesive sediment
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生物膜对粘性沉积物流变特性的影响

DOI:
10.1007/s10750-012-1140-y
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发表时间:
2012-06
期刊:
影响因子:
2.6
通讯作者:
Chen Minghong
Chen Minghong
中科院分区:
生物学3区
文献类型:
--
作者:
Fang Hongwei;Zhao Huiming;Shang Qianqian;Chen Minghong

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生物膜是生物代谢活动的产物,对粘性沉积物的理化性质有重要影响。然而,很少有人努力确定生物膜生长对特定沉积物性质的实质性影响,例如流变学性质。了解与生物膜的生长和量化的时间尺度,这些变化发生的变化是很重要的了解生物膜如何介导沉积物的性质和过程和沉积物输运力学的发展。实验研究了生物膜对粘性泥沙流变特性的影响。对不同生长阶段有、无生物膜沉积物的流变特性进行了测定和比较。实验结果表明,生物膜的生长对粘性沉积物的流变特性有显著影响。提出了生物膜沉积物的流变方程和流变特性随时间变化的表达式。这些方程,以及生物膜沉积物的信息,是重要的生物沉积学过程列入模型的沉积动力学。
Biofilm, a product of metabolic activity, has an important effect on the physico-chemical properties of cohesive sediment. However, little effort has been made to determine the substantial effects of biofilm growth on specific sediment properties, for example rheological properties. Understanding the changes associated with biofilm growth and quantifying the time scales over which these changes occur are important for understanding how biofilms mediate sediment properties and processes and the development of sediment transport mechanics. The effect of biofilm on the rheological properties of cohesive sediment was investigated experimentally. The rheological properties of sediment slurries with and without biofilm at different growth phases were measured and compared. Measurement showed biofilm growth has a significant effect on the rheological properties of cohesive sediment. Rheological equations for biofilm sediment and expressions for rheological properties which change over time are proposed. These equations, and information on biofilm sediment, are important for inclusion of biosedimentological processes in models of sediment dynamics.
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