Multiagency Critical Loads
The Multiagency Critical Load (CL) pilot project was conducted for the National Park Service, U.S. EPA, and U.S. Forest Service. The goal was to estimate the steady-state CL (and associated exceedance) values for protecting stream resources against biological harm from acidification. The study area was the Blue Ridge, Ridge and Valley, and Central Appalachian ecoregions of Virginia and West Virginia.
One important objective of this research was to develop an alternative approach for estimating base cation weathering (BCw) across the regional landscape. The BCw term is arguably the key term for estimating CL using the Steady State Water Chemistry (SSWC) model (or any other aquatic steady state CL model). We used the dynamic model MAGIC (Model of Acidification of Groundwater in Catchments) to estimate watershed-specific values of effective BCw. Based on empirical relationships between simulated BCw and key stream chemistry variables and watershed characteristics, we extrapolated simulated BCw and other spatial variables to the regional population of streams, allowing regional calculation of CL and CL exceedance using SSWC.
This report is available for downloading here.
Appalachian Trail Project
E&S Environmental Chemistry is working as a collaborator on the Appalachian Trail MEGA-Transect Atmospheric Deposition Effects Study. This ongoing work is being conducted for the National Park Service under direction of the U.S. Geological Survey. E&S's role in the project involves compiling various spatial databases to assist in sampling site selection, developing a geological sensitivity classification system, extrapolating site-specific results to the broader landscape within the Appalachian Trail corridor, and synthesizing and integrating of project findings.
This project is ongoing. Results are not yet available.