Closure and validation of a SWAT model for daily scale sediment simulations

LI Erhui; WANG Bingjie; FU Xudong

doi:10.16511/j.cnki.qhdxxb.2019.26.025

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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

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Closure and validation of a SWAT model for daily scale sediment simulations

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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.

Key words

SWAT model / sediment rating curve / closed relationship / daily scale / Huangfuchuan basin

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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 https://doi.org/10.16511/j.cnki.qhdxxb.2019.26.025

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