scholarly journals Influences of Flow Transients and Porous Medium Heterogeneity on Colloid-Associated Contaminant Transport in the Vadose Zone

2003 ◽  
Author(s):  
James Saiers ◽  
Joseph Ryan
Keyword(s):  
Porous Medium ◽  
Contaminant Transport ◽  
Vadose Zone ◽  
Medium Heterogeneity ◽  
Flow Transients

Effects of Porous Medium Heterogeneity on Vadose Zone Desiccation: Intermediate-Scale Laboratory Experiments and Simulations

2012 ◽  
Vol 11 (4) ◽  
pp. vzj2011.0168 ◽  
Author(s):  
M. Oostrom ◽  
V.L. Freedman ◽  
T.W. Wietsma ◽  
J.H. Dane ◽  
M.J. Truex
Keyword(s):  
Porous Medium ◽  
Vadose Zone ◽  
Laboratory Experiments ◽  
Intermediate Scale ◽  
Medium Heterogeneity

Hydrodynamic Dispersion Coefficient of Urea in Silty Loam Soil

2019 ◽  
Vol 6 (04) ◽  
Author(s):  
RAM PAL ◽  
H C SHARMA ◽  
M IMTIYAZ
Keyword(s):  
Transport Phenomenon ◽  
Porous Medium ◽  
Contaminant Transport ◽  
Dispersion Coefficient ◽  
Hydrodynamic Dispersion ◽  
Soil Columns ◽  
Soil Medium ◽  
Adverse Health Effects ◽  
Silty Loam ◽  
Loam Soil

The modern theme of agriculture is not only to increase production but also to minimize undesirable environmental effects. Leaching of surface-applied fertilizer is the major source of groundwater pollution. Nitrogenous fertilizers are the most popular among the Indian farmers, which on leaching reach the groundwater in different forms (NH4-N, NO3-N, etc). NO3-N leaches faster than other types, remains in-reactive in groundwater, moves with the velocity of groundwater and contaminates it. Contamination arises when NO3-N accumulates in groundwater and consumed in high amount by humans and animals, may result in adverse health effects. For the study of contaminant transport phenomenon in porous medium, a general convection dispersion equation is used, in which dispersion coefficient is one of the primary parameters necessary to be determined for a particular soil. Keeping it in view a study was conducted to assess different available techniques to determine the dispersion coefficient with the help of soil columns having silty loam soil as soil medium. The value of the dispersion coefficient obtained for silty loam soil, by this method was equal to 0.00576 m2.

The effect of subsurface military detonations on vadose zone hydraulic conductivity, contaminant transport and aquifer recharge

2013 ◽  
Vol 146 ◽  
pp. 8-15 ◽  
Author(s):  
Jeffrey Lewis ◽  
Jan Burman ◽  
Christina Edlund ◽  
Louise Simonsson ◽  
Rune Berglind ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Contaminant Transport ◽  
Vadose Zone ◽  
Aquifer Recharge
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