Respectively, Post-Doc Research Fellow, Department of Geography, University of Guelph, Guelph, Ontario, Canada NIG 2W1 (previous address: South Dakota Water Resources Inst., Ag Engineering 211 Box 2120, Brookings, South Dakota 57007); and Associate Professor, School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, Louisiana 70803 (E-Mail/Wu: firstname.lastname@example.org).
EVALUATION OF THE APPLICABILITY OF THE SWAT MODEL FOR COASTAL WATERSHEDS IN SOUTHEASTERN LOUISIANA1
Article first published online: 8 JUN 2007
JAWRA Journal of the American Water Resources Association
Volume 42, Issue 5, pages 1247–1260, October 2006
How to Cite
Wu, K. and Xu, Y. J. (2006), EVALUATION OF THE APPLICABILITY OF THE SWAT MODEL FOR COASTAL WATERSHEDS IN SOUTHEASTERN LOUISIANA. JAWRA Journal of the American Water Resources Association, 42: 1247–1260. doi: 10.1111/j.1752-1688.2006.tb05298.x
Paper No. 04229 of the Journal of the American Water Resources Association (JAWRA)
- Issue published online: 8 JUN 2007
- Article first published online: 8 JUN 2007
- geospatial analysis;
- Manning's roughness coefficient;
- watershed management;
- coastal watershed
ABSTRACT: The Soil and Water Assessment Tool (SWAT) has been used for hydrologic analyses at various watershed scales. However, little is known about the model's performance in coastal watersheds. In this study SWAT was evaluated for its applicability in three Louisiana coastal watersheds: the Amite, Tickfaw, and Tangipahoa River watersheds. The model was calibrated with daily discharge from 1976 to 1977 and validated from 1979 to 1999 for the Amite and Tangipahoa and with daily discharge from 1979 to 1989 for the Tickfaw. Deviation of mean discharge and the Nash-Sutcliffe model efficiency were used to evaluate model behavior. The study found that Manning's roughness coefficient for the main channel, SCS curve number, and soil evaporation compensation factor were the most sensitive parameters for these coastal watersheds. The Manning's roughness coefficient showed the greatest effect on the response time of surface runoff, suggesting the critical role of channel routing in hydrologic modeling for lowland watersheds. The SWAT model demonstrated an excellent performance, with Nash-Sutcliffe efficiencies of 0.935, 0.940, and 0.960 for calibrations of the Amite, Tickfaw, and Tangipahoa watersheds, respectively, and of 0.851, 0.811, and 0.867 for validations. The modeling results demonstrate that SWAT is capable of simulating hydrologic processes for medium scale to large scale coastal lowland watersheds in Louisiana.