SWAT ungauged: Water quality modeling in the Upper Mississippi River Basin

JOURNAL OF HYDROLOGY

卷:584

Article

Qi, Junyu¹  Zhang, Xuesong^1,2,3  Yang, Qichuan⁴  Srinivasan, R.^5,6  Arnold, Jeffrey G.⁷  Li, Jia⁸  Waldholf, Stephanie T.^2,3  Cole, Jefferson⁸ 

[1] Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20740 USA

[2] Pacific Northwest Natl Lab, Joint Global Change Res Inst, College Pk, MD 20740 USA

[3] Univ Maryland, College Pk, MD 20740 USA

[4] Univ Melbourne, Dept Infrastruct Engn, Parkville, Vic 3010, Australia

[5] Texas A&M Univ, Dept Ecosyst Sci & Management, College Stn, TX 77843 USA

[6] Texas A&M Univ, Dept Biol & Agr Engn, College Stn, TX 77843 USA

[7] USDA ARS, Grassland Soil & Water Res Lab, Temple, TX 76502 USA

[8] US EPA, 1200 Penn Ave,NW 6207 A, Washington, DC 20460 USA

关键词: Stream flow;    Sediment;    Nitrate;    Total nitrogen;    Watershed;   

DOI  :  10.1016/j.jhydrol.2020.124601

来源: Elsevier

【 摘 要 】

Improving model performance in ungauged basins has been a chronic challenge in watershed model application to understand and assess water quality impacts of agricultural conservation practices, land use change, and climate adaptation measures in large river basins. Here, we evaluate a modified version of SWAT2012 (referred to as SWAT-EC hereafter), which integrates an energy balanced soil temperature module (STM) and the CENTRUY-based soil organic matter algorithm, for simulating water quality parameters in the Upper Mississippi River Basin (UMRB), and compare it against the original SWAT2012. Model evaluation was performed for simulating streamflow, sediment, and nitrate-N (NO3-N) and total nitrogen (TN) loadings at three stations near the outlets of UMRB. The model comparison was conducted without parameter calibration in order to assess their performance under ungauged conditions. The results indicate that SWAT-EC outperformed SWAT2012 for stream flow and NO3-N and TN loading simulation on both monthly and annual scales. For sediment, SWAT-EC performed better than SWAT2012 on a monthly time step basis, but no noticeable improvement was found at the annual scale. In addition, the performance of the uncalibrated SWAT-EC was comparable to other calibrated SWAT models reported in previous publications with respect to sediment and NO3-N loadings. These findings highlight the importance of advancing process representation in physically-based models to improve model credibility, particularly in ungauged basins.

【 授权许可】

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