Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 4 of 4
Full-Text Articles in Engineering
Environmental Impacts To Stream Acidification And Brook Trout Populations In The Great Smoky Mountains National Park, Keil Jason Neff
Environmental Impacts To Stream Acidification And Brook Trout Populations In The Great Smoky Mountains National Park, Keil Jason Neff
Doctoral Dissertations
This research supports development of aquatic resource management strategies to address acid deposition in the Great Smoky Mountain National Park (GRSM) by 1) developing relationships between baseflow and stormflow chemical constituents and examining effects of elevation, area, geology, soil, and vegetation on stream chemistry; 2) evaluating physiological condition in brook trout in relation to changes in stream chemistry during stream acidification episodes, and 3) evaluating brook trout metrics with respect to stream chemistry, basin characteristics, and ecologically relevant hydrologic parameters. (1) Stream chemistry was monitored in eight GRSM streams considering basin area, site elevation, Anakeesta geology, soil, and vegetation. Following …
Effects Of 2000-2050 Global Climate Change On Ozone And Particulate Matter Air Quality In The United States Using Models-3/Cmaq System, Yun-Fat Lam
Doctoral Dissertations
The Models-3/Community Multi-scale Air Quality modeling system (CMAQ), coupled with Goddard Institute for Space Studies (GISS) atmospheric General Circulation Model (GCM), fifth Generation Mesoscale Model system (MM5), and Goddard Earth Observing System-CHEMistry (GEOS-Chem), was used to simulate atmospheric concentration of ozone and particulate matter over the continental United States 12-km and 36-km (CONUS) domains at year 2000 and year 2050. In the study, GISS GCM model outputs interfaced with MM5 were utilized to supply the current and future meteorological conditions for CMAQ. The conventional CMAQ profile initial and boundary conditions were replaced by time-varied and layer-varied GEOS-Chem outputs. The future …
Improving Ozone Sip Modeling In Complex Terrain At A Fine Grid Resolution, Yunhee Kim
Improving Ozone Sip Modeling In Complex Terrain At A Fine Grid Resolution, Yunhee Kim
Doctoral Dissertations
Meteorological variables such as temperature, wind speed, wind directions, and Planetary Boundary Layer (PBL) heights have critical implications for air quality simulations. Sensitivity simulations with five different PBL schemes associated with three different Land Surface Models (LSMs) were conducted to examine the impact of meteorological variables on the predicted ozone concentrations using the Community Multiscale Air Quality (CMAQ) version 4.5 with local perspective. Additionally, the nudging analysis for winds was adopted with three different coefficients to improve the wind fields in the complex terrain at 4-km grid resolution. The simulations focused on complex terrain having valley and mountain areas for …
Long-Term Acid Deposition Effects On Soil And Water Chemistry In The Noland Divide Watershed, Great Smoky Mountains National Park, Usa, Meijun Cai
Doctoral Dissertations
Impacts of long-term acid deposition on soil and water chemistry are of particular concern in the Great Smoky Mountains National Park (GRSM), receiving some of the highest acid deposition rates in the eastern United States and limited by inadequate acid buffering capacity. In the GRSM, the Noland Divide watershed (NDW) has been monitored since 1991 for water chemistries of precipitation, throughfall, soil, and stream. The impacts of long-term acidic deposition on stream water quality in the NDW were investigated through: 1) development of an ion input-output budget; 2) analysis of trends and seasonal patterns for major ions; 3) comparison of …