Unsaturated Soil
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2021 ◽  
pp. 106447
Author(s):  
Qian Zhai ◽  
Weimin Ye ◽  
Harianto Rahardjo ◽  
Alfrendo Satyanaga ◽  
Guoliang Dai ◽  
...  

2021 ◽  
Vol 5 ◽  
pp. 100290
Author(s):  
Kennedy C. Onyelowe ◽  
Chilakala B. Mahesh ◽  
Bandela Srikanth ◽  
Chidobere Nwa-David ◽  
Jesuborn Obimba-Wogu ◽  
...  

Author(s):  
Monami Kondo ◽  
Yasuhide Sakamoto ◽  
Yoshishige Kawabe ◽  
Kengo Nakamura ◽  
Noriaki Watanabe ◽  
...  

AbstractThis work developed a model for predicting the volatilization flux from the unsaturated soil contaminated by volatile chemical substances (VCSs) such as mercury and benzene. The model considers a series of phenomena under the unsaturated condition such as multi-phase flow consisting of a non-aqueous phase liquid, water, and gases together with the permeation of rainfall into the surface soil, the volatilization/condensation of VCSs, and the adsorption/desorption of VCSs. On this basis, this work clarified a mechanism for the generation of a volatilization flux at the ground surface. In addition, the effects of various transport phenomena in the surface soil on the magnitude and seasonal changes in this flux due to variations in weather factors such as rainfall level, temperature, and air pressure were quantitatively evaluated. This newly developed prediction model can be utilized to estimate dynamic variations in the flux under real-environmental conditions.


2021 ◽  
Vol 5 (4) ◽  
pp. 153
Author(s):  
Gaoliang Tao ◽  
Qing Wang ◽  
Qingsheng Chen ◽  
Sanjay Nimbalkar ◽  
Yinjie Peng ◽  
...  

At present, there are only a few existing models that can be used to predict the relative permeability of unsaturated soil under deformations, and the calculation process is relatively complex. In order to fit the measured value of the relative permeability coefficient of unsaturated soil before deformation, this work employs the simplified unified model of the relative permeability coefficient of unsaturated soil, and it obtains the index λ before deformation of the soil. In addition, the value of index λ remains unchanged before and after deformation. Based on the actual measured value of the soil–water characteristic curve before deformation, the air-entry value prediction model is used to predict the air-entry value of soil with different initial void ratios. The relative permeability coefficient of unsaturated soil is then conveniently predicted using the graphical method in combination with the simplified unified model. The method is validated by using the test data of silt loam, sandy loam, and unconsoildated sand. The results show that the predicted results are consistent with the measured values. The prediction method in this paper is simple and overcomes the limitations associated with the determination of the index λ. It expands the application range of the unsaturated relative permeability coefficient model while improving the accuracy of predictions.


Author(s):  
Arindam Malakar ◽  
Daniel D. Snow ◽  
Michael Kaiser ◽  
Jordan Shields ◽  
Bijesh Maharjan ◽  
...  

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