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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (5): 124-130.doi: 10.11924/j.issn.1000-6850.casb2022-0156

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Study on Non-point Source Pollution Load of Liangtan River Basin Based on SWAT Model

TANG Jie1(), CHEN Yao1,2(), CHENG Qiming1   

  1. 1 School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074
    2 Engineering Laboratory of Environmental Hydraulic Engineering of Chongqing Municipal Development and Reform Commission, Chongqing Jiaotong University, Chongqing 400074
  • Received:2022-03-05 Revised:2022-05-08 Online:2023-02-15 Published:2023-02-06

Abstract:

To grasp the spatial and temporal distribution characteristics of nitrogen and phosphorus pollutants in Liangtan River Basin, the SWAT (Soil and Water Assessment Tool) model of nitrogen and phosphorus load was constructed based on spatial and meteorological data. The model was calibrated and verified by monitoring data, and the main non-point source pollution sources of each sub-basin were evaluated by projection pursuit method. The results showed that the model had good applicability in the study area, nitrogen and phosphorus emissions were mainly concentrated in the wet season (May to September), accounting for 76% of the whole year. Nitrogen and phosphorus load was mainly from pesticides and fertilizers, and the total nitrogen emission was the main part. Spatially, surface runoff pollution was dominant in the central part of the basin, while soil erosion was more serious in the western part of the basin, and the pollution load was closely related to sediment discharge.

Key words: non-point source pollution, SWAT model, nitrogen and phosphorus load, projection pursuit, Liangtan River Basin