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809087 
Journal Article 
Soil mixing depth after atmospheric deposition. I. Model development and validation 
Drivas, P; Bowers, T; Yamartino, R 
2011 
1 
Atmospheric Environment
ISSN: 1352-2310
EISSN: 1873-2844 
PERGAMON-ELSEVIER SCIENCE LTD 
OXFORD 
45 
25 
4133-4140 
8 
English 
WOS:000293107600002 
Abstract: Knowledge of a soil mixing depth, or the migration depth of various pollutants in soil, is necessary to assess the soil chemical concentration resulting from atmospheric deposition of a specific air emission source. A mathematical model has been developed that describes the depth and time behavior of the soil concentration of an inert chemical after atmospheric deposition on surfaces. The soil mixing model is based on one-dimensional diffusion theory, and analytic solutions have been derived for the cases of: (1) instantaneous surface deposition; (2) continuous surface deposition; and (3) a finite period of continuous surface deposition, followed by a deposition-free time period. Comparisons of the model with measured soil depth profiles resulting from atmospheric deposition showed good agreement for lead, cesium, and dioxins. The best-fit effective diffusion coefficients in undisturbed soils varied from 0.5cm2 yr−1 to 2cm2 yr−1. The soil mixing depth was found to be a strong function of the atmospheric deposition time period. Calculated soil mixing depths in undisturbed soils were 2cm after one year, 5cm after five years, and 10cm after 20 years of continuous atmospheric deposition on the soil surface. 
SOILS -- Composition;ATMOSPHERIC deposition;SOIL pollution;EMISSIONS (Air pollution);SOILS -- Lead content;CESIUM;DIOXINS;MATHEMATICAL models;SOIL depth 
08