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Simulating Runoff from a Grid Based Mercury Model: Flow Comparisons
Citation:
GOLDEN, H. E. AND C. D. KNIGHTES. Simulating Runoff from a Grid Based Mercury Model: Flow Comparisons. Presented at Computational Methods in Water Resources Conference, San Francisco, CA, July 06 - 10, 2008.
Impact/Purpose:
To assess the ecological exposure risks associated with anthropogenically increased atmospheric mercury (Hg) deposition, soil Hg concentrations, and consequent surface water fluxes.
Description:
Several mercury cycling models, including general mass balance approaches, mixed-batch reactors in streams or lakes, or regional process-based models, exist to assess the ecological exposure risks associated with anthropogenically increased atmospheric mercury (Hg) deposition, soil Hg concentrations, and consequent surface water fluxes. However, few mercury models exist at the scale of watersheds and include the coupling of processes involving multiple sources (atmospheric and terrestrial) and transformations of Hg, and watershed loading to surface water bodies. This is particularly important in large basins, where few mercury modeling studies have been conducted. We are refining a grid-based watershed Hg model (GBMM v2.0, Tetra Tech, 2006) that computes mass balances for hydrology, sediment, and mercury within each GIS raster grid cell and produces flux estimates of each to a tributary network.