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Improvement and application of the PCPF‐1@SWAT2012 model for predicting pesticide transport: a case study of the Sakura River watershed
Author(s) -
Tu Le Hoang,
Boulange Julien,
Iwafune Takashi,
Yadav Ishwar Chandra,
Watanabe Hirozumi
Publication year - 2018
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.4934
Subject(s) - soil and water assessment tool , watershed , paddy field , environmental science , swat model , hydrology (agriculture) , mean squared error , pesticide , coefficient of determination , agronomy , mathematics , statistics , drainage basin , streamflow , biology , geography , cartography , geotechnical engineering , engineering , machine learning , computer science
BACKGROUND The Soil and Water Assessment Tool combined with Pesticide Concentration in Paddy Field (PCPF‐1@SWAT) model was previously developed to simulate the fate and transport of rice pesticides in watersheds. However, the current model is deficient in characterizing the rice paddy area and is incompatible with the ArcSWAT2012 program. In this study, we modified the original PCPF‐1@SWAT model to develop a new PCPF‐1@SWAT2012 model to address the deficiency in the rice paddy area and utilizing the ArcSWAT2012 program. Next, the new model was applied to the Sakura River watershed, Ibaraki, Japan in order to simulate the transport of four herbicides: mefenacet, pretilachlor, bensulfuron‐methyl and imazosulfuron. RESULTS The results showed that the water flow rate simulated by PCPF1@SWAT2012 was similar with the observed data. The calculated Nash–Sutcliffe efficiency coefficient (NSE) (0.73) and percent bias (PBIAS) (–20.38) suggested satisfactory performance of the model. In addition, the concentrations of herbicides simulated by the PCPF‐1@SWAT2012 model were in good agreement with the observed data. The statistical indices NSE and root mean square error (RMSE) estimated for mefenacet (0.69 and 0.18, respectively), pretilachlor (0.86 and 0.18, respectively), bensulfuronmethyl (0.46 and 0.21, respectively) and imazosulfuron (0.64 and 0.28, respectively) indicated satisfactory predictions. CONCLUSION The PCPF‐1@SWAT2012 model is capable of simulating well the water flow rate and transport of herbicides in this watershed, comprising different land use types, including a rice paddy area. © 2018 Society of Chemical Industry