Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2015WR018517 |
A mechanistic model (BCC-PSSICO) to predict changes in the hydraulic properties for bio-amended variably saturated soils | |
Carles Brangari, Albert1,2; Sanchez-Vila, Xavier1,2; Freixa, Anna3; M. Romani, Anna3; Rubol, Simonetta4; Fernandez-Garcia, Daniel1,2 | |
2017 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:1 |
文章类型 | Article |
语种 | 英语 |
国家 | Spain; USA |
英文摘要 | The accumulation of biofilms in porous media is likely to influence the overall hydraulic properties and, consequently, a sound understanding of the process is required for the proper design and management of many technological applications. In order to bring some light into this phenomenon we present a mechanistic model to study the variably saturated hydraulic properties of bio-amended soils. Special emphasis is laid on the distribution of phases at pore-scale and the mechanisms to retain and let water flow through, providing valuable insights into phenomena behind bioclogging. Our approach consists in modeling the porous media as an ensemble of capillary tubes, obtained from the biofilm-free water retention curve. This methodology is extended by the incorporation of a biofilm composed of bacterial cells and extracellular polymeric substances (EPS). Moreover, such a microbial consortium displays a channeled geometry that shrinks/swells with suction. Analytical equations for the volumetric water content and the relative permeability can then be derived by assuming that biomass reshapes the pore space following specific geometrical patterns. The model is discussed by using data from laboratory studies and other approaches already existing in the literature. It can reproduce (i) displacements of the retention curve toward higher saturations and (ii) permeability reductions of distinct orders of magnitude. Our findings also illustrate how even very small amounts of biofilm may lead to significant changes in the hydraulic properties. We, therefore, state the importance of accounting for the hydraulic characteristics of biofilms and for a complex/more realistic geometry of colonies at the pore-scale. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000394911200006 |
WOS关键词 | POROUS-MEDIA ; WATER-RETENTION ; BIOFILM GROWTH ; PHYSICAL-PROPERTIES ; CONDUCTIVITY ; FLOW ; MICROORGANISMS ; IMPACT ; PERMEABILITY ; TRANSPORT |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
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/21155 |
专题 | 资源环境科学 |
作者单位 | 1.UPC, Dept Civil & Environm Engn, Barcelona, Spain; 2.UPC, CSIC, Associated Unit, Hydrogeol Grp, Barcelona, Spain; 3.Univ Girona, Inst Aquat Ecol, Dept Environm Sci, Girona, Spain; 4.Univ Southern Calif, Marine Environm Biol Sect, Dept Biol Sci, Los Angeles, CA USA |
推荐引用方式 GB/T 7714 | Carles Brangari, Albert,Sanchez-Vila, Xavier,Freixa, Anna,et al. A mechanistic model (BCC-PSSICO) to predict changes in the hydraulic properties for bio-amended variably saturated soils[J]. WATER RESOURCES RESEARCH,2017,53(1). |
APA | Carles Brangari, Albert,Sanchez-Vila, Xavier,Freixa, Anna,M. Romani, Anna,Rubol, Simonetta,&Fernandez-Garcia, Daniel.(2017).A mechanistic model (BCC-PSSICO) to predict changes in the hydraulic properties for bio-amended variably saturated soils.WATER RESOURCES RESEARCH,53(1). |
MLA | Carles Brangari, Albert,et al."A mechanistic model (BCC-PSSICO) to predict changes in the hydraulic properties for bio-amended variably saturated soils".WATER RESOURCES RESEARCH 53.1(2017). |
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