Nitrate Leaching Through Unsaturated Soil Columns: Comparison Between Numerical and Analytical Solutions

2006 ◽  
Vol 6 (4) ◽  
pp. 735-743 ◽  
Author(s):  
A. Al-Darby ◽  
G. Abdel-Nasser .
Keyword(s):  
Unsaturated Soil ◽  
Analytical Solutions ◽  
Nitrate Leaching ◽  
Soil Columns

Examination of the Penetration of Enteric Viruses in Soils under Simulated Conditions in the Laboratory

1985 ◽  
Vol 17 (10) ◽  
pp. 197-199 ◽  
Author(s):  
P. H. Jørgensen
Keyword(s):  
Sewage Sludge ◽  
Unsaturated Soil ◽  
Sandy Loam ◽  
Soil Column ◽  
Enteric Viruses ◽  
Soil Surface ◽  
Coxsackievirus B3 ◽  
Soil Columns ◽  
Sand Column ◽  
Loam Soil

In two different unsaturated soil columns percolated with artificial rainwater under simulated aerated conditions, transport of coxsackievirus B3 and adenovirus 1 below 3.5 cm under the soil surface could not be demonstrated. The viruses were applied to the columns as seeded sewage sludge. Under saturated conditions transport of water-suspended coxsackievirus B3 was faster in a soil column with sandy loam soil than in a diluvial sand column.

Leaching and transformability of transgenic DNA in unsaturated soil columns

2010 ◽  
Vol 73 (1) ◽  
pp. 67-72 ◽  
Author(s):  
John Poté ◽  
Maria Teresa Ceccherini ◽  
Walter Rosselli ◽  
Walter Wildi ◽  
Pascal Simonet ◽  
...  
Keyword(s):  
Unsaturated Soil ◽  
Soil Columns

Transport of phthalate-esters in undisturbed and unsaturated soil columns

1991 ◽  
Vol 8 (2) ◽  
pp. 111-133 ◽  
Author(s):  
T. Zurmühl ◽  
W. Durner ◽  
R. Herrmann
Keyword(s):  
Unsaturated Soil ◽  
Phthalate Esters ◽  
Soil Columns

Vapor transport in unsaturated soil columns: Implications for vapor extraction

1992 ◽  
Vol 28 (2) ◽  
pp. 323-335 ◽  
Author(s):  
John S. Gierke ◽  
Neil J. Hutzler ◽  
David B. McKenzie
Keyword(s):  
Unsaturated Soil ◽  
Vapor Transport ◽  
Soil Columns ◽  
Vapor Extraction

scholarly journals 2D Plane Strain Consolidation Process of Unsaturated Soil with Vertical Impeded Drainage Boundaries

Processes ◽  
2018 ◽  
Vol 7 (1) ◽  
pp. 5 ◽  
Author(s):  
Minghua Huang ◽  
Dun Li
Keyword(s):  
Analytical Solution ◽  
Laplace Transform ◽  
Plane Strain ◽  
Unsaturated Soil ◽  
Analytical Solutions ◽  
Soil Layer ◽  
Permeability Ratio ◽  
Consolidation Process ◽  
The Time Domain ◽  
Excess Pore Pressures

The consolidation process of soil stratum is a common issue in geotechnical engineering. In this paper, the two-dimensional (2D) plane strain consolidation process of unsaturated soil was studied by incorporating vertical impeded drainage boundaries. The eigenfunction expansion and Laplace transform techniques were adopted to transform the partial differential equations for both the air and water phases into two ordinary equations, which can be easily solved. Then, the semi-analytical solutions for the excess pore-pressures and the soil layer settlement were derived in the Laplace domain. The final results in the time domain could be computed by performing the numerical inversion of Laplace transform. Furthermore, two comparisons were presented to verify the accuracy of the proposed semi-analytical solutions. It was found that the semi-analytical solution agreed well with the finite difference solution and the previous analytical solution from the literature. Finally, the 2D plane strain consolidation process of unsaturated soil under different drainage efficiencies of the vertical boundaries was illustrated, and the influences of the air-water permeability ratio, the anisotropic permeability ratio and the spacing-depth ratio were investigated.

scholarly journals A Nitrification Inhibitor, Nitrapyrin, Reduces Potential Nitrate Leaching through Soil Columns Treated with Animal Slurries and Anaerobic Digestate

Agronomy ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 865
Author(s):  
Caterina Giacometti ◽  
Martina Mazzon ◽  
Luciano Cavani ◽  
Claudio Ciavatta ◽  
Claudio Marzadori
Keyword(s):  
Nitrate Leaching ◽  
Nitrate Concentration ◽  
Nitrification Inhibitor ◽  
N Immobilization ◽  
Pig Slurry ◽  
Soil Columns ◽  
N Accumulation ◽  
Anaerobic Digestate ◽  
Microbial Nitrogen ◽  
Microbial N

A leaching experiment was designed to study the effects of a commercial nitrification inhibitor containing nitrapyrin on nitrification, microbial nitrogen (N) immobilization, and nitrate leaching. Soil columns were treated with 100 mg N kg−1 from pig slurry, cattle slurry, and anaerobic digestate in a mixture with or without the nitrification inhibitor. Destructive sampling was carried out after 0, 7, and 28 days of incubation in the dark at 18 °C. At each sampling date, artificial rain (200 mm of 0.01 M calcium chloride over 4 h) was added to the soil columns. The leachate was collected, and the soil was removed from the columns and sectioned into 5 cm segments. Results indicated that after 28 days of incubation, nitrapyrin enhanced ammoniacal N accumulation in the top layers of the soil columns and reduced the nitrate concentration in the leachates with pig slurry and anaerobic digestate. Furthermore, in the soil columns treated with anaerobic digestate, nitrapyrin promoted microbial N immobilization. These findings suggest that the use of nitrapyrin in a mixture with animal slurry and anaerobic digestate has the potential to reduce nitrate leaching and increase N retention in the topsoil, affording both environmental and economic advantages.

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