Long‐Term Simulation of Decreased Acid Loading on Forested Watershed
Publication: Journal of Environmental Engineering
Volume 120, Issue 2
Abstract
The response of a northeastern U.S. hardwood forest to wet and dry deposition of hydrogen ion and sulfate deposition was performed using the hydrobiogeochemical, lumped‐parameter Terrestrial Aquatic Model for Ecosystems (TAME). Results of model calibration and output stream chemistry show that ion‐exchange and mineral dissolution processes in the B and C horizons buffer the acidic, ambient atmospheric deposition [ and 718 eq‐H+/(ha/yr)] in this hydrologically tight and flashy watershed. Watershed response to a 50% decrease in total deposition of acidity over twenty years indicates that the watershed is linear with respect to sulfate (50% decrease in mass outflow) but less responsive with respect to acid neutralizing capacity, ANC (11% increase in stream volume‐weighted average ANC concentrations). Only moderate improvements in ANC can be expected from emission controls and decreased sulfate deposition.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 120 • Issue 2 • March 1994
Pages: 291 - 312
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Jan 27, 1992
Published online: Mar 1, 1994
Published in print: Mar 1994
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