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Showing 1 to 20 of 66 for “"soil column"”.
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The Soil-Column Method and Other Techniques for Evaluating Soil Fungicides
Made available in DSpace on 2014-12-05T20:30:14Z (GMT). No. of bitstreams: 1 6200635.pdf: 3515548 bytes, checksum: 513c85d3bdf7e1cd6a4459abd892711a (MD5) Previous issue date: 1961
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Evaluation of Soil Aquifer Treatment in a Lab Scale Soil Column Experiment
Soil aquifer treatment (SAT) during managed aquifer recharge has been studied as a method of providing additional environmental barriers to pathogens and contaminants in indirect potable reuse (IPR) applications. A soil column study was conducted by Hampton Roads Sanitation District in order to …
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Evaluation of struvite leaching potential relative to monoammonium phosphate through field and soil column trials
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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The coupled transport of water and heat in a vertical soil column under atmospheric excitation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1980.
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The Numerical Analysis of Infiltration, Considering Hysteresis, Into a Vertical Soil Column at Equilibrium Under Gravity
Made available in DSpace on 2014-12-10T17:12:22Z (GMT). No. of bitstreams: 1 6500933.pdf: 8839137 bytes, checksum: 182c1b66f2dd7f0cbd3d39a985cf94c2 (MD5) Previous issue date: 1964
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Carbon and nitrogen dynamics on a forest site receiving continual papermill sludge applications: a soil column study
… via land application depends upon sludge-induced soil changes associated with carbon (C) and nitrogen (N) cycles within the soil/plant system. The C, N, and hydrologic cycles within a soil/sludge system receiving a year-round, daily application of paper mill sludge were studied. Soil samples were …
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Application of oxygen microbubbles for in situ biodegradation of p-xylene contaminated ground water in a soil column
… of p-xylene was studied in a 2.75 inch diameter column using oxygen microbubbles to supply the electron acceptor. One objective was to demonstrate that pxylene can be biodegraded in the soil column and to follow the degradation and pressure drops as a function of time. The next objective was to …
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Evaluation of Contaminant Removal Through Soil Aquifer Treatment by a Lab Scale Soil Column Experiment Including a Trace Contaminant Spike Test
Soil aquifer treatment (SAT), the removal of contaminants during percolation through soil, is a strategy employed in managed aquifer recharge (MAR), one method of indirect potable water reuse. As part of Hampton Roads Sanitation District's (HRSD) MAR project, The Sustainable Water Initiative for …
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Stormwater treatment during infiltration and its effect on shallow urban groundwater quality in the Cape Flats Aquifer: field study and soil-column experiments
… treatment during infiltration through the soil, and to investigate whether stormwater infiltration could result in deterioration of groundwater quality in the underlying Cape Flats Aquifer. Research was conducted in the field by monitoring stormwater and groundwater quality at the study …
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Simulation of concentration effects on mobility and persistence of alachlor
… investigation was divided into two components: soil column study and model study. In the soil column study, PVC pipe was hand packed to a depth of 30 cm with Catlin silt loam soil. The surface of the soil columns was contaminated with alachlor at rates of 3, 30 and 3000 kg a.i./ha. Columns were …
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One-dimensional site response analyses in potentially liquefiable soil profiles
The seismic performance of soil profiles with potentially liquefiable deposits is a complex phenomenon that requires a thorough understanding of the soil properties and ground motion characteristics. The limitations of simplified liquefaction assessment methods have prompted an increase in the use …
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The effects of winter cover cropping on nutrient leaching through repacked soil columns
… ecosystems. This study utilized laboratory-scale soil columns and the one-dimensional water and solute transport model HYDRUS-1D to quantify and understand the potential decrease in nitrogen and phosphorus loss through tile drainage due to cover crops, as well as compare the amount of nitrogen and …
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Effect of formulation on the movement of atrazine, alachlor, and metribuzin in a coarse-textured soil
… in a Plainfield sand was evaluated in field and soil column experiments. Controlled release formulations included starch-based encapsulations of the three herbicides and a commercially available microencapsulation.
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Effects of Experimental Scale on the Adsorption of Two Pharmaceutical Drugs Detected in Municipal Wastewater Effluent
… groundwater, and municipal drinking water. Soil aquifer treatment (SAT) is a promising method for treating these emerging compounds through combined adsorption and degradation of target compounds in soil. This thesis examines the consistency of results from typical studies like adsorption …
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Utilization of carbon-rich waste materials to reduce pesticide movement to groundwater in a sandy coarse-textured soil
Pesticide use on coarse-textured soils frequently leads to groundwater contamination. Based on the fact that organic carbon is the primary contributor to pesticide sorption in soil-water systems, a resolution of this problem is anticipated through external application of organic carbon sources. In …
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Velocity and celerity in a forested headwater catchment : a combined experimental and modelling approach
… irrigation experiments at different scales, from soil column to hillslope, to a sub-catchment scale analysis in a forested headwater catchment characterised by fractured bedrock. Our field experiments proved the importance of bedrock cleavage orientation in controlling subsurface flow direction …
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Seismic Site Response and Extraction of Dynamic Soil Behavior From Downhole Array Measurements
… computed ground motions, and include randomized soil column properties representing the Mississippi Embayment to evaluate depth dependent site coefficients. Probabilistic seismic hazard maps considering effects of thick soil deposit for Mississippi Embayment are proposed.
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Subsurface transport of fertilizer-applied nitrogen on the eastern shore of Virginia
… the transportation of nitrogen through the soil column, past the crop root zone to groundwater. Then MOC (Method of Characterization), a groundwater model, was used to transport the nitrogen that had reached the water table offsite. Results were compared to existing field data in an attempt …
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The influence of redox dynamics on nitrogen cycling and nitrous oxide emissions from soils
Soils are a dominant source of nitrous oxide (N2O), a potent greenhouse gas. The complexity of drivers of N2O production and emissions has hindered our ability to predict the magnitude and spatial dynamics of N2O fluxes. Soil moisture can be considered a key driver because it influences oxygen …
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Approximate analytical solutions for modeling subsurface flow
… unsaturated flow of water in a homogeneous soil column of finite length with arbitrary initial conditions. The boundary conditions considered at the soil surface correspond to pre-ponding and post-ponding infiltration.
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