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Showing 1 to 13 of 13 for “"SEAM3D"”.
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A Numerical Model (SEAM3D) to Assess the Biotransformation of Chlorinated Ethenes at a TCE/BTEX Contaminated Site
Numerical models (GMS MODFLOW, SEAM3D, and SEAM3D Interface) were applied to simulate groundwater flow, petroleum hydrocarbon compound (PHC) transport and biodegradation, and the transport and biotransformation of chlorinated ethenes at Site FT-002 Plattsburgh Air Force Base (PAFB), NY. Site FT-002 …
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Sequential Electron Acceptor Model of Intrinsic Bioremediation at a BTEX Contaminated LUST Site in Laurel Bay, South Carolina
… sequential electron acceptor computer model, SEAM3D, developed by Waddill and Widdowson (1997) was used to simulate contaminant transport at a leaking underground storage tank site in Beaufort, South Carolina. Gasoline containing benzene, toluene, ethylbenzene, and xylene (BTEX) as well as …
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Numerical Modeling for the Solute Uptake from Groundwater by Plants-Plant Uptake Package
… to time. The new package is integrated into SEAM3D to create a new SEAM3D Plant Uptake Package, or PUP. The model is then verified by comparing results for root sorption in one side to the SEAM3D Reaction Package, and results for plant uptake to the SEAM3D Source Sink Mixing Package. The …
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Mathematical Modeling of Reductive Transformation Kinetics of Branched Degradation Pathways of Groundwater Contaminants
… implemented in solute transport codes such as SEAM3D (Waddill and Widdowson 2000). However, TNT degrades through more complex branched pathways, and kinetic models are lacking in the current literature. This research study was undertaken with the objective of extending the kinetic model …
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Impacts of Sequential Microbial Electron Accepting Processes on Natural Attenuation of Selected Petroleum Hydrocarbons in the Subsurface Environment
… electron acceptor fate and transport model SEAM3D (Waddill and Widdowson, 1997) to evaluate the impact of including iron(III)-reducing conditions during numerical simulations of natural attenuation. Results for this phase of the study indicated that the mass of hydrocarbon simulated as …
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Assessment of Intrinsic Bioremediation at a PCE Contaminated Site
… the groundwater data. The microcosm model used SEAM3D to simulate the results of the microcosm experiments (concentration versus time data) to estimate the biodegradation rates of PCE and its daughter products. The SEAM3D reductive dechlorination package, based on Monod kinetics, predicted for …
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RECOVERY-RD: The Development of a Biotransformation Model for Sediment Systems Contaminated with PCBs
… transport in stratified sediment, and SEAM3D, a numerical transport model for contaminated groundwater systems. The predictions made by RECOVERY-RD are verified using a series of test cases organized to test each phase of the modification process individually. The results show that the …
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Effect of Unsteady Surface Water Hydraulics on Mixing-Dependent Hyporheic Denitrification in Riverbed Dunes
… through a riverbed dune using MODFLOW and SEAM3D, and varied SW depth, degree of sediment heterogeneity, amplitude and frequency of sinusoidal fluctuations, among others to determine these effects. We found that increasing steady state surface water depth from 0.1 to 1.0 m increased …
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Controls on Mixing and Non-Mixing Dependent Denitrification in River Hyporheic Zones
… to SW is less understood. I used MODFLOW and SEAM3D to simulate hyporheic flow cells induced by riverbed dunes and upwelling GW together with mixing dependent denitrification of an upwelling nitrate (NO3-) plume. My basecase model scenario entailed dissolved organic carbon (DOC) and dissolved …
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Mixing and Attenuation of Upwelling Groundwater Contaminants in the Hyporheic Zone
… reaction. The numerical models MODFLOW and SEAM3D were then used to simulate the experimental data to better understand hydraulic and transport processes underlying laboratory observations and provide sensitivity analysis on hydraulic and reaction kinetic parameters. Visualization techniques …
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In the Zone: the Effects of Soil Pipes and Dunes on Hyporheic and Riparian Zone Hydraulics and Biogeochemistry
… MODFLOW but now pairing with the transport code SEAM3D to simulate microbially-mediated aerobic metabolism of dissolved organic carbon and dissolved oxygen, the combined effects of dune translation and microbial growth and death were explored. Major findings include that neglecting microbial …
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Methodology for Using a Non-Linear Parameter Estimation Technique for Reactive Multi-Component Solute Transport Modeling in Ground-Water Systems
… multi component reactive solute transport model SEAM3D. The reactive multi-component solutes considered in this study are chlorinated ethenes. Previous studies have shown that this class of compounds can be degraded by four different biodegradation mechanisms, and the degradation path is a …
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Influence of Petroleum Deposit Geometry on Long Term Persistence of Residual Crude Oil
Following the DWH oil spill event, crude oil reaching the shoreline of Gulf of Mexico produced petroleum oil deposit with a range of distinct geometries, including sphere tar balls and horizontal tar sheets. Numerical models were developed based on the Deep Water Horizon oil spill conditions to …