SURFACE WATER NITRATE VARIABILITY IN NORTH CAROLINA: ESTIMATION FROM MONITORING DATA, LAND USE, AND POINT SOURCES
Public Deposited- Last Modified
- March 19, 2019
- Creator
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Smedsmo, Jamie
- Affiliation: Gillings School of Global Public Health, Department of Environmental Sciences and Engineering
- Abstract
- In this study, we estimate nitrate concentrations across the state of North Carolina to improve monitoring and management of nitrogen over-enrichment. Riverine nitrate concentrations were estimated at times and locations where it was not observed using a combination of land use regression and space/time geostatistics. We demonstrate how the two methods are complimentary, with an increase in R2 from 0.21 with the land use regression only model to R2 0.73 with the combined model. The time-averaged land use regression model identified source variables including (1) Developed Areas (2) Manure Mass (3) NPDES Point Sources (4) Septic Sewer System Density (5) Wastewater Treatment Residual Fields; Waste Treatment Residuals have not commonly been identified previously as important at a large area scale. Maps of riverine nitrate concentrations show strong spatial patterns, with higher concentrations near the urban areas in the Piedmont region and lower concentrations in the Blue Ridge and Plains regions.
- Date of publication
- August 2015
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- DOI
- Identifier
- Resource type
- Rights statement
- In Copyright
- Advisor
- MacDonald Gibson, Jacqueline
- Serre, Marc
- Characklis, Gregory
- Degree
- Master of Science
- Degree granting institution
- University of North Carolina at Chapel Hill Graduate School
- Graduation year
- 2015
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- Place of publication
- Chapel Hill, NC
- Access right
- There are no restrictions to this item.
- Date uploaded
- August 25, 2015
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