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Published online 25 May 2007
Published in J Environ Qual 36:996-1005 (2007)
DOI: 10.2134/jeq2006.0228
© 2007 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Modeling Riverine Nitrate Export from an East-Central Illinois Watershed Using SWAT

X. Hua,*, G. F. McIsaacb, M. B. Davidb and C. A. L. Louwersb

a Dep. of Civil and Environmental Engineering, 4158 Newmark Lab., 205 North Mathews Avenue, Urbana, IL
b Dep. of Natural Resources and Environmental Sciences, Univ. of Illinois at Urbana Champaign W-503 Turner Hall, 1102 South Goodwin Avenue, Urbana, IL


Figure 1
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  		Fig. 1. Upper Embarras River watershed and subwatershed divisions used in this study.

 

Figure 2
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  		Fig. 2. Simulated vs. observed monthly stream flow in the upper Embarras River for (a) the calibration period (1994–2002) and (b) the validation period (1985–1993).

 

Figure 3
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  		Fig. 3. Simulated vs. measured annual stream flow in the upper Embarras River for (a) the calibration period (1994–2002) and (b) the validation period (1985–1993).

 

Figure 4
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  		Fig. 4. Time series of simulated and measured annual riverine NO3 flux in the upper Embarras River for (a) the calibration period (1994–2002) and (b) the validation period (1985–1993).

 

Figure 5
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  		Fig. 5. Time series of simulated and measured monthly riverine NO3 flux in the upper Embarras River for (a) the calibration period (1994–2002) and (b) the validation period (1985–1993).

 

Figure 6
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  		Fig. 6. Model residuals (simulated minus observed) for the validation period.

 

Figure 7
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  		Fig. 7. Time series of simulated and measured maize and soybean yield in the upper Embarras River watershed for (a) the calibration period (1994–2002) and (b) the validation period (1985–1993).

 




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