Toluene biodegradation rates in unsaturated soil systems versus liquid batches and their relevance to field conditions

2012 ◽  
Vol 97 (17) ◽  
pp. 7887-7898 ◽  
Author(s):  
Sara Picone ◽  
Tim Grotenhuis ◽  
Pauline van Gaans ◽  
Johan Valstar ◽  
Alette Langenhoff ◽  
...  
Keyword(s):  
Unsaturated Soil ◽  
Field Conditions ◽  
Soil Systems ◽  
Toluene Biodegradation

A column study of static nonequilibrium fluid pressures in sand during prolonged drainage

1994 ◽  
Vol 31 (2) ◽  
pp. 299-303 ◽  
Author(s):  
S. Lee Barbour ◽  
Ernest K. Yanful
Keyword(s):  
Hydraulic Conductivity ◽  
Numerical Modelling ◽  
Unsaturated Soil ◽  
Fluid Pressure ◽  
Coarse Sand ◽  
Residual Water ◽  
Residual Saturation ◽  
Sand Column ◽  
Soil Systems ◽  
Theoretical Analyses

In the design of layered soil systems, such as the design of liners or covers over unsaturated soil, a key design concern is the magnitude of negative fluid pressure that will develop along the base of the liner or cover. In the absence of evaporation or vapour migration, the maximum negative fluid pressures will develop near the cessation of drainage. Previous theoretical analyses and numerical modelling of these systems have indicated that this pressure will be the pressure at which an underlying sand reaches its residual water content. The hydraulic conductivity of the sand at these pressures is so small that "static" nonequilibrium pressures are sustained over long periods of time. In this note, laboratory verification is provided for the magnitude of these pressures based on drainage of a fine and coarse sand column. Key words : covers, liners, air-entry value, residual saturation, layering, drainage.

Modeling of the gaseous diffusion coefficient through unsaturated soil systems

1997 ◽  
Vol 29 (1) ◽  
pp. 1-21 ◽  
Author(s):  
C.E. Schaefer ◽  
R.R. Arands ◽  
H.A. van der Sloot ◽  
D.S. Kosson
Keyword(s):  
Diffusion Coefficient ◽  
Unsaturated Soil ◽  
Gaseous Diffusion ◽  
Soil Systems

scholarly journals Characteristics of Heat and Water Transfer in Unsaturated Soil Zone under Field Conditions.

1997 ◽  
Vol 10 (1) ◽  
pp. 20-31 ◽  
Author(s):  
Toshitsugu MOROIZUMI ◽  
Haruhiko HORINO ◽  
Toshisuke MARUYAMA ◽  
Yuichi SATO ◽  
Koichi SATO
Keyword(s):  
Unsaturated Soil ◽  
Water Transfer ◽  
Field Conditions ◽  
Soil Zone
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