title: A study on pesticide runoff from paddy fields to a river in rural region--2: development and application of a mathematical model.
abstract: A mathematical model was developed to predict the runoff of pesticides from paddy fields to a river in a rural region. The model comprises three submodels: (1) submodel for river flow, (2) submodel for pesticide behavior in paddy fields, (3) submodel for pesticide behavior in a river. The tank model was applied to predict the river flow and the paddy water. In order to reproduce the actual behavior of pesticides in paddy fields, the kinetics of the transport and reaction mechanisms of pesticides applied to paddy fields were considered in the model. The model was applied to the Kozakura River Basin where the detailed field survey was conducted. The model reflected well the runoff characteristics of pesticides obtained from the detailed field survey.
authors.affiliation: Department of Environmental Chemistry and Engineering, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8502, Japan. nakano@chemenv.titech.ac.jp
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Nakano
authors.forename: Tomohiko
authors.initials: T
authors.lastname: Yoshida
authors.forename: Takanobu
authors.initials: T
authors.lastname: Inoue
mesh_terms: D000383:Agriculture; D007564:Japan; D007700:Kinetics; D008962:Models, Theoretical; D012275:Oryza; D010575:Pesticides / Q000032:analysis*; D011891:Rain; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D010575:Pesticides; D014874:Water Pollutants, Chemical