Barbara A. Bekins

TL;DR: Simulation results confirm that the main degradation pathway can be attributed to methanogenic degradation of organic compounds in the smear zone and the vadose zone resulting in a contaminant plume dominated by high CH(4) concentrations and highlight the need to better delineate gas fluxes at the model boundaries, which will help constrain contaminant degradation rates, and ultimately source zone longevity.

TL;DR: Inverse modeling was successful when coupled transport and degradation processes were incorporated into the model and a single dissolution rate coefficient was used for all BTEX components, and results were similar for simulations obtained using several alternative conceptual models of the hydrologic system and biodegrades.

TL;DR: In this article, the authors combine a numerical model of groundwater flow with critical taper theory to quantify the effects of sediment and decollement permeability, sediment thickness, sediment partitioning between accretion and underthrusting, and plate convergence rate on steady state pore pressure.

TL;DR: In this paper, a parsimonious transport model was applied at 14 sites across the U.S. to identify key processes affecting distribution of agricultural nitrate in groundwater, and the results revealed important interactions among biogeochemical and physical factors.

TL;DR: In this article, the USGS solute transport and biodegradation code BIOMOC was used in conjunction with UCODE to quantify field-scale hydrocarbon dissolution and degradation at a crude-oil spill research site located near Bemidji, MN.