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Validation of WEPP Sediment Feedback Relationships using Spatially Distributed Rill Erosion Data

^a USDA-ARS, Grazinglands Research Lab., 7207 W. Cheyenne St., El Reno, OK 73036
^b Xi'an Technology Univ., Xi'an, Shaanxi 710048, PRC, and Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, PRC
^c Institute of Soil and Water Conservation, Yangtse Academy of Sciences, Wuhan, Hubei 430010, PRC

View larger version (8K): [in a new window]   Fig. 1. Schematic representation of experiment setup.

View larger version (24K): [in a new window]   Fig. 2. Changes of average flow velocity and flow width along the slope profile at the 10.5% slope with scouring time and inflow rates.

View larger version (37K): [in a new window]   Fig. 3. Effects of sediment loading rates on downslope rill detachment during scouring tests at the 10.5% slope and five inflow rates.

View larger version (35K): [in a new window]   Fig. 4. Effects of sediment loading rates on downslope rill detachment during scouring tests at the 15.8% slope and five inflow rates.

View larger version (36K): [in a new window]   Fig. 5. Effects of sediment loading rates on downslope rill detachment during scouring tests at the 21.2% slope and five inflow rates.

View larger version (15K): [in a new window]   Fig. 6. Rill detachment capacity as a function of flow shear stress.

View larger version (20K): [in a new window]   Fig. 7. Fitted detachment capacity (Dc) and sediment transport capacity (Tc) as well as calculated rate control coefficients (Dc/Tc) as functions of flow shear stress.

View larger version (31K): [in a new window]   Fig. 8. The Water Erosion Prediction Project (WEPP) model-calculated rill detachment rates versus rare earth element (REE)-measured detachment rates at each measurement interval and segment at all slopes and inflow rates.