SWAT Literature Database for Peer-Reviewed Journal Articles

Title:
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Modeling phosphorus in the Lake Allatoona watershed using SWAT: II. Effect of land use change 
Authors:
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Z. Lin, D.E. Radcliffe, L.M. Risse, J.J. Romeis, and C.R. Jackson 
Year:2007 
Journal:Journal of Environmental Quality 
Volume:38 
Pages:121-129 
Article ID: 
DOI:10.2134/jeq2007.0111 
URL (non-DOI journals): 
Model:SWAT 
Broad Application Category:hydrologic & pollutant 
Primary Application Category:land use change 
Secondary Application Category:nutrient cycling and transport 
Watershed Description:
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Upper Etowah, Shoal Creek, Little/Noonday, Owl/Kellogg, Acworth/Allatoona, and Stamp/Rowland subwatersheds of the 2,870 km^2 Lake Allatoona watershed in northern Georgia. 
Calibration Summary:
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Validation Summary: 
General Comments: 
Abstract:Lake Allatoona is a large reservoir northeast of metropolitan Atlanta, GA, threatened by excessive algal growth. We used the calibrated Soil and Water Assessment Tool (SWAT) models developed in our companion paper to estimate the annual P load to Lake Allatoona in 1992 and in 2001 after significant changes occurred in land use. Land use data in 1992 and 2001 from the Multi-Resolution Land Characteristics (MRLC) Consortium showed that forest land use decreased during this period by about 20%, urban land use increased by about 225%, and pasture land uses increased by about 50%. Simulation results showed that the P load to Lake Allatoona increased from 176.5 to 207.3 Mg, which were 87.8% and 103.1%, respectively, of the total P (TP) annual cap (201 Mg) set by the Georgia Environmental Protection Division (GAEPD) for discharge into Lake Allatoona. In the early 1990s, the greatest sources of the TP load to Lake Allatoona (and their percentages of the total load) were pasture (33.6%), forest (27.5%), and point sources (25.0%). Urban land uses contributed about 6.0% and row-crop agriculture contributed about 6.8%. A decade later, the greatest two TP sources were pasture (52.7%) and urban (20.9%) land uses. Point-source P loads decreased significantly to 11.6%. Permit limits on poultry processing plants reduced the point-source P loads, but increasing urban and pasture land uses increased nonpoint sources of P. To achieve further reductions in the P load to Lake Allatoona, contributions from pasture and urban nonpoint sources will need to be addressed. 
Language:English 
Keywords: