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Journal of Tsinghua University(Science and Technology)    2019, Vol. 59 Issue (12) : 975-980     DOI: 10.16511/j.cnki.qhdxxb.2019.26.025
Closure and validation of a SWAT model for daily scale sediment simulations
LI Erhui, WANG Bingjie, FU Xudong
State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
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Abstract  A closed relationship for daily maximum sediment concentration was developed to solve the scale matching problem between the sediment concentration and the flow velocity in the SWAT model. A power function was used to fit the daily flow rate to the sedimentation flux at 9 gauging stations located in the soft sandstone region of the middle Yellow River to provide a closed relationship for the daily sedimentation rate. The closed SWAT model was then used to simulate the sediment transport in the Huangfuchuan watershed of the Yellow River. The model was validated by comparing the observed and simulated sediment loads at the Huangfu and Shagedu stations. The results showed that the Nash-Sutcliffe efficiency coefficient (NSE) was 0.70 and the determination coefficient (R2) was 0.74 during the calibration period and were equal to 0.66 and 0.68 during the validation period for the daily scale sediment load at the Huangfu station. The closed SWAT model predictions at the Shagedu station correlated with the observed sediment load with NSE=0.78 and R2=0.78 for the calibration period and NSE=0.72 and R2=0.74 for the validation period. The unclosed SWAT model had NSE=0.36 and R2=0.39 for the calibration period and NSE=0.26 and R2=0.26 for the validation period at the Shagedu station. The results indicate that the closed SWAT model improves the simulation accuracy for sediment transport within the basin to improve applications of the SWAT model in the soft sandstone region for sediment simulation.
Keywords SWAT model      sediment rating curve      closed relationship      daily scale      Huangfuchuan basin     
Issue Date: 19 December 2019
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LI Erhui
WANG Bingjie
FU Xudong
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LI Erhui,WANG Bingjie,FU Xudong. Closure and validation of a SWAT model for daily scale sediment simulations[J]. Journal of Tsinghua University(Science and Technology), 2019, 59(12): 975-980.
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