HR: 08:15h
AN: H41G-02    [Abstracts]
TI: SWAT Model of Etowah River Basin Phosphorus Transport
AU: * Radcliffe, D E
EM: dradclif@uga.edu
AF: Crop and Soil Sciences Department, Univeristy of Georgia, Athens, GA 30602 United States
AU: Lin, Z
EM: linzhulu@uga.edu
AF: Crop and Soil Sciences Department, Univeristy of Georgia, Athens, GA 30602 United States
AB: The Etowah River Basin forms the watershed of Lake Allatoona in North Georgia. Lake Allatoona is classified as in transition to eutrophic and the state has placed a cap on annual phosphorus (P) loads to the lake. Our objective was to develop a watershed-scale model of P transport to Lake Allatoona using the Soil Water Assessment Tool (SWAT). We used the Parameter Estimator (PEST) software for auto-calibration of daily water flow and manual calibration for SS and P concentrations. We also used PEST to conduct a sensitivity analysis. PEST did an excellent job of calibrating flow, although there was a tendency to under-predict peak flow during storms. There was a tendency to under-predict base-flow concentrations of SS and P and it was difficult to judge how well the model was calibrated for storm SS and P predictions due to the sparse observed data set. The most sensitive parameters for predicting P yield were two hydrologic parameters (one of which was curve number) followed by 3 parameters related to P in soil. Sediment-related parameters were also among the 10 most sensitive parameters.
DE: 1804 Catchment
DE: 1846 Model calibration (3333)
DE: 1847 Modeling
DE: 1862 Sediment transport (4558)
DE: 1871 Surface water quality
SC: Hydrology [H]
MN: Fall Meeting 2005