Simulation of solute transport across low-permeability barrier walls

2006 ◽  
Vol 85 (3-4) ◽  
pp. 247-270 ◽  
Author(s):  
Philip T. Harte ◽  
Leonard F. Konikow ◽  
George Z. Hornberger
Keyword(s):  
Solute Transport ◽  
Permeability Barrier ◽  
Low Permeability

Effects of a low-permeability layer on unstable flow pattern and land-sourced solute transport in coastal aquifers

2021 ◽  
pp. 126397
Author(s):  
Jiaxu Zhang ◽  
Chunhui Lu ◽  
Chengji Shen ◽  
Chenming Zhang ◽  
Jun Kong ◽  
...  
Keyword(s):  
Solute Transport ◽  
Flow Pattern ◽  
Coastal Aquifers ◽  
Low Permeability ◽  
Unstable Flow

scholarly journals Editorial of Special Issue “Advances in Groundwater Flow and Solute Transport: Pushing the Hidden Boundary”

Water ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 457
Author(s):  
Hongbin Zhan ◽  
Quanrong Wang ◽  
Zhang Wen
Keyword(s):  
Numerical Methods ◽  
Groundwater Flow ◽  
Solute Transport ◽  
Vadose Zone ◽  
Regional Scale ◽  
Chemical Transport ◽  
Low Permeability ◽  
Special Issue ◽  
Flow And Transport ◽  
Wide Range

The theme of this special issue is to explore the new territories beyond conventional subsurface flow and transport theories. We have selected 12 articles in this special issue and these articles cover a wide range of problems including (1) Non-Fickian chemical transport in various environments; (2) Non-Darcian flow; (3) Flow and transport in low-permeability media; (4) Vadose zone process; (5) Regional scale groundwater flow and groundwater-surface interaction; (6) Innovative numerical methods. The major contributions of these papers are summarized in this editorial.

scholarly journals Molecular Insights into the Low Permeability Barrier of Gram-Negative Pathogens

2016 ◽  
Vol 110 (3) ◽  
pp. 35a
Author(s):  
Cesar A. Lopez Bautista ◽  
S. Gnanakaran ◽  
Helen Zgurskaya
Keyword(s):  
Permeability Barrier ◽  
Low Permeability ◽  
Gram Negative

The role of β-lactamase and the permeability barrier on the activity of cephalosporins against members of the Bacteroides fragilis group

1987 ◽  
Vol 33 (3) ◽  
pp. 262-266 ◽  
Author(s):  
François Malouin ◽  
François Lamothe
Keyword(s):  
Clavulanic Acid ◽  
Bacterial Species ◽  
Bacteroides Fragilis ◽  
Permeability Barrier ◽  
Low Permeability ◽  
Minimal Inhibitory Concentrations ◽  
Bacteroides Fragilis Group ◽  
Agar Dilution ◽  
Species Specific

The role of β-lactamase and the permeability barrier on the activity of some β-lactams against 53 strains of the Bacteroides fragilis group was investigated. Minimal inhibitory concentrations of cefamandole, cefoxitin, and cephalothin were determined with or without the addition of clavulanic acid and (or) ethylenediaminetetraacetate using an agar dilution technique. A significant increase of susceptibility with clavulanic acid indicated a role for β-lactamase, and with ethylenediaminetetraacetate, a role for a permeability barrier. We found that both β-lactamase and low permeability decreased the activity of the β-lactams to some extent depending on the bacterial species and the antibiotic. The species-specific exception was B. distasonis which showed only a permeability barrier to all antibiotics tested.

scholarly journals SOLUTE TRANSPORT MODELLING IN LOW-PERMEABILITY HOMOGENEOUS AND SATURATED SOIL MEDIA

2021 ◽  
Vol 36 (2) ◽  
pp. 25-32
Author(s):  
Muhammad Zaheer ◽  
Hadayat Ullah ◽  
Saad Ahmed Mashwani ◽  
Ehsan ul Haq ◽  
Syed Husnain Ali Shah ◽  
...  
Keyword(s):  
Solute Transport ◽  
Preferential Flow ◽  
Relative Concentration ◽  
Breakthrough Curves ◽  
Saturated Soil ◽  
Low Permeability ◽  
Transport Modelling ◽  
Variation Of Parameters ◽  
Solute Transport Modeling ◽  
Soil Media

Fickian and non-Fickian behaviors were often detected for contaminant transport activity owed to the preferential flow and heterogeneity of soil media. Therefore, using diverse methods to measure such composite solute transport in soil media has become an important research topic for solute transport modeling in soil media. In this article, the continuous-time random walk (CTRW) model was applied to illustrate the relative concentration of transport in low-permeability homogeneous and saturated soil media. The solute transport development was also demonstrated with the convection-dispersion equation (CDE) and Two Region Model (TRM) for comparison. CXTFIT 2.1 software was used for CDE and TRM, and CTRW Matlab Toolbox v.3.1 for the CTRW simulation of the breakthrough curve. It was found that higher values of determination coefficient (R2) and lower values of root mean square error (RMSE) concerning the best fits of CDE, TRM, and CTRW. It was found that in the comparison of CDE, TRM, and CTRW, we tend to use CTRW to describe the transport behavior well because there are prevailing Fickian and non-Fickian transport. The CTRW gives better fitting results to the breakthrough curves (BTCs) when β has an increasing pattern towards 2.00. In this study, the variation of parameters in three methods was investigated and results showed that the CTRW modeling approach is more effective to determine non-reactive contaminants concentration in low-permeability soil media at small depths.

scholarly journals A methodology for characterizing the hydraulic effectiveness of an annular low-permeability barrier

2011 ◽  
Vol 120 (1-4) ◽  
pp. 68-80 ◽  
Author(s):  
Víctor Vilarrasa ◽  
Jesús Carrera ◽  
Anna Jurado ◽  
Estanislao Pujades ◽  
Enric Vázquez-Suné
Keyword(s):  
Permeability Barrier ◽  
Low Permeability
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