Science Inventory

NIGHTHAWK - A Program for Modeling Saturated Batch and Column Experiments Incorporating Equilibrium and Kinetic Biogeochemistry

Citation:

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).

Impact/Purpose:

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.

Description:

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.

URLs/Downloads:

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Record Details:

Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Product Published Date: 02/01/2010
Record Last Revised: 04/22/2010
OMB Category: Other
Record ID: 194985