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NIGHTHAWK - A Program for Modeling Saturated Batch and Column Experiments Incorporating Equilibrium and Kinetic Biogeochemistry
MATOTT, L. S. AND A. J. RABIDEAU. NIGHTHAWK - A Program for Modeling Saturated Batch and Column Experiments Incorporating Equilibrium and Kinetic Biogeochemistry . COMPUTERS & GEOSCIENCES. Elsevier Science Ltd, New York, NY, 36(2):253-256, (2010).
Development of the NIGHTHAWK software was motivated by an interest in simulating saturated subsurface biodegradation processes while accounting for the effects of interrelated inorganic geochemical reactions.
NIGHTHAWK simulates the fate and transport of biogeochemically reactive contaminants in the saturated subsurface. Version 1.2 supports batch and one- dimensional advective-dispersive-reactive transport involving a number of biogeochemical processes, including: microbially-mediated degradation, inorganic redox chemistry, aqueous-phase equilibrium speciation, kinetic and equilibrium precipitation and dissolution of minerals, and a variety of sorption processes, including surface complexation, competitive ion exchange, and linear/nonlinear isotherms. Governing equations are solved using finite-differences and a fully kinetic operator-splitting technique. To demonstrate NIGHTHAWK and evaluate its performance, the program was applied to scenarios involving nitrate biodegradation and sequential parent-daughter decay. NIGHTHAWK simulation results and computational performance compared favorably to two alternative modeling codes.