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Field Results and Model Predicted Unsaturated Hydraulic Behavior of Evapotranspiration Cover
Evapotranspiration (ET) landfill cover, having several advantages over the conventional cover, is now being widely used for landfill closure. Effectiveness of an ET cover depends on site-specific factors such as climate, soil hydraulic properties, and vegetation. The variation of the degree of saturation (S) and matric suction (Ψ) of soil due to the fluctuation in the environmental parameters, mostly precipitation and temperature may affect the performance of an ET cover. The objective of the current research is to inspect the S and Ψ variation of a test section ET cover soil under actual climatic condition and simulate these results through numerical modeling. Test section ET cover (lysimeter), having dimension of 12 m × 12 m × 1.2 m (40 ft × 40 ft × 4 ft), constructed at the City of Denton landfill, Texas, was selected for this study. Moisture content and matric suction were measured by sensors, installed in the lysimeter at different depths. Local fine-grained soil was used during the construction of the lysimeter. Soil water characteristic curve (SWCC) of the lysimeter soil was determined in the laboratory. Finite-Element (FE) model PLAXIS 2D was used to numerically simulate the water movement through unsaturated soil cover. Based on the input soil and climatic parameters, the change in the Ψ and S was investigated in the model and compared with the field instrumentation data. The generated model could reproduce the relative fluctuation of Ψ and S with the varying precipitation input. The average variation in Ψ and S was found to be 24% and 6.71%, respectively, in the shallower depth (0.3 m), while the variation was found 28% and 22% for the deeper depth (0.76 m). The study revealed that FE modeling can provide a practical indication of soil hydraulic behavior of ET cover systems on a broader scale.
Field Results and Model Predicted Unsaturated Hydraulic Behavior of Evapotranspiration Cover
Evapotranspiration (ET) landfill cover, having several advantages over the conventional cover, is now being widely used for landfill closure. Effectiveness of an ET cover depends on site-specific factors such as climate, soil hydraulic properties, and vegetation. The variation of the degree of saturation (S) and matric suction (Ψ) of soil due to the fluctuation in the environmental parameters, mostly precipitation and temperature may affect the performance of an ET cover. The objective of the current research is to inspect the S and Ψ variation of a test section ET cover soil under actual climatic condition and simulate these results through numerical modeling. Test section ET cover (lysimeter), having dimension of 12 m × 12 m × 1.2 m (40 ft × 40 ft × 4 ft), constructed at the City of Denton landfill, Texas, was selected for this study. Moisture content and matric suction were measured by sensors, installed in the lysimeter at different depths. Local fine-grained soil was used during the construction of the lysimeter. Soil water characteristic curve (SWCC) of the lysimeter soil was determined in the laboratory. Finite-Element (FE) model PLAXIS 2D was used to numerically simulate the water movement through unsaturated soil cover. Based on the input soil and climatic parameters, the change in the Ψ and S was investigated in the model and compared with the field instrumentation data. The generated model could reproduce the relative fluctuation of Ψ and S with the varying precipitation input. The average variation in Ψ and S was found to be 24% and 6.71%, respectively, in the shallower depth (0.3 m), while the variation was found 28% and 22% for the deeper depth (0.76 m). The study revealed that FE modeling can provide a practical indication of soil hydraulic behavior of ET cover systems on a broader scale.
Field Results and Model Predicted Unsaturated Hydraulic Behavior of Evapotranspiration Cover
Alam, Md. Jobair Bin (author) / Bhandari, Prabesh (author) / Hossain, Md. Sahadat (author)
Geo-Congress 2022 ; 2022 ; Charlotte, North Carolina
Geo-Congress 2022 ; 1-11
2022-03-17
Conference paper
Electronic Resource
English
Field Results and Model Predicted Unsaturated Hydraulic Behavior of Evapotranspiration Cover
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