Modification of SWAT Model Parameters and Application: Case Study on the Runoff Area of Deze Reservoir

XIN Jing-da; LI Ya-qiang; CHEN Cheng; YANG Dong-hao; YU Qian; WANG Jian-xiong

doi:10.11988/ckyyb.20211115

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Journal of Changjiang River Scientific Research Institute ›› 2023, Vol. 40 ›› Issue (3) : 30-36. DOI: 10.11988/ckyyb.20211115

WATER RESOURCES

Modification of SWAT Model Parameters and Application: Case Study on the Runoff Area of Deze Reservoir

XIN Jing-da, LI Ya-qiang, CHEN Cheng, YANG Dong-hao, YU Qian, WANG Jian-xiong

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Abstract

Affected by human activities and major water conservancy projects, the SWAT model has some shortcomings in the calculation of river parameters and average slope length. We use remote sensing technology and empirical formulas to modify the unreasonable parameters. After modifying the parameters, we select parameters that are more sensitive to hydrology and water quality processes and employ SWAT-CUP software to optimize the model. The calibration and verification accuracy are satisfactory. The R² and NS of runoff is 0.764 3-0.967 4 and 0.754 8-0.899 8, respectively, and the R² and NS of total nitrogen load is 0.546 2-0.659 9 and 0.526 8-0.638 8, respectively. The results indicate that given the other parameters unchanged,the present method better reflects the real topography and river channel information in the basin, and also improves the simulation accuracy of the model's monthly runoff. R² increased from 0.834 9 to 0.871 9, and NS increased from 0.698 7 to 0.771 8.

Key words

SWAT / parameter modification / channel parameters / average slope length / remote sensing technology / empirical formulas / Deze reservoir

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XIN Jing-da, LI Ya-qiang, CHEN Cheng, YANG Dong-hao, YU Qian, WANG Jian-xiong. Modification of SWAT Model Parameters and Application: Case Study on the Runoff Area of Deze Reservoir[J]. Journal of Changjiang River Scientific Research Institute. 2023, 40(3): 30-36 https://doi.org/10.11988/ckyyb.20211115

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