Paper No. JAWRA-08-0093-P of the Journal of the American Water Resources Association (JAWRA). © 2009 American Water Resources Association. Discussions are open until October 1, 2009.
Evaluation of a Watershed Model for Estimating Daily Flow Using Limited Flow Measurements1
Article first published online: 25 MAR 2009
© 2009 American Water Resources Association
JAWRA Journal of the American Water Resources Association
Volume 45, Issue 2, pages 475–484, April 2009
How to Cite
Du, B., Ji, X., Harmel, R. D. and Hauck, L. M. (2009), Evaluation of a Watershed Model for Estimating Daily Flow Using Limited Flow Measurements. JAWRA Journal of the American Water Resources Association, 45: 475–484. doi: 10.1111/j.1752-1688.2009.00303.x
- Issue published online: 25 MAR 2009
- Article first published online: 25 MAR 2009
- Received May 25, 2008; accepted September 1, 2008.
- Soil and Water Assessment Tool;
- daily flow estimation;
- model evaluation;
- Upper Oyster Creek watershed;
Abstract: The Soil and Water Assessment Tool (SWAT) model was evaluated for estimation of continuous daily flow based on limited flow measurements in the Upper Oyster Creek (UOC) watershed. SWAT was calibrated against limited measured flow data and then validated. The Nash-Sutcliffe model Efficiency (NSE) and mean relative error values of daily flow estimations were 0.66 and 15% for calibration, and 0.56 and 4% for validation, respectively. Also, further evaluation of the model’s estimation of flow at multiple locations was conducted with parametric paired t-test and nonparametric sign test at a 95% confidence level. Among the five main stem stations, four stations were statistically shown to have good agreement between predicted and measured flows. SWAT underestimated the flow of the fifth main stem station possibly because of the existence of complex flood control measures near to the station. SWAT estimated the daily flow at one tributary station well, but with relatively large errors for the other two tributaries. The spatial pattern of predicted flows matched the measured ones well. Overall, it was concluded from the graphical comparisons and statistical analyses of the model results that SWAT was capable of reproducing continuous daily flows based on limited flow data as is the case in the UOC watershed.