An AGNPS-based runoff and sediment yield model for two small watersheds in Germany
Journal Article
·
· Transactions of the ASAE
The event-based Agricultural Non-Point Source (AGNPS) pollution model is used extensively to simulate surface runoff, sediment yield and nutrient transport in unmonitored watersheds. Investigation, that compare AGNPS predictions to measured data are rare. The objective of the present study was to compare surface runoff and sediment yield predictions from AGNPS water quality simulation model and modified versions to measured data. Shortcomings of the AGNPS model were examined. The study was carried out using 52 rainfall-runoff events, 22 for calibration and 30 for validation, from two small watersheds (G1 and G2) in Bavaria, Germany. Evaluation of model outputs was based on statistical comparisons between measured and predicted values for each rainfall-runoff event. The authors compared three different surface runoff prediction methods: uncalibrated curve number (Q1), calibrated curve number (Q2), and Lutz (Q3). The modifications made to sediment yield calculations encompassed: (i) replacement of the Universal Soil Loss Equation LS factor algorithm (S1) by one based on stream power theory (S2), and (ii) linkage of channel erosion by individual categories of particle size to runoff velocity (S3).
- Research Organization:
- Univ. of Wisconsin, Madison, WI (US)
- OSTI ID:
- 20080239
- Journal Information:
- Transactions of the ASAE, Journal Name: Transactions of the ASAE Journal Issue: 6 Vol. 42; ISSN TAAEAJ; ISSN 0001-2351
- Country of Publication:
- United States
- Language:
- English
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