title: A new methodology for determining dispersion coefficient using ordinary and partial differential transport equations.
abstract: The present study proposes a methodology for determining the effective dispersion coefficient based on the field measurements performed in Gwangju (GJ) Creek in South Korea which is environmentally degraded by the artificial interferences such as weirs and culverts. Many previous works determining the dispersion coefficient were limited in application due to the complexity and artificial interferences in natural stream. Therefore, the sequential combination of N-Tank-In-Series (NTIS) model and Advection-Dispersion-Reaction (ADR) model was proposed for evaluating dispersion process in complex stream channel in this study. The series of water quality data were intensively monitored in the field to determine the effective dispersion coefficient of E. coli in rainy day. As a result, the suggested methodology reasonably estimates the dispersion coefficient for GJ Creek with 1.25 m(2)/s. Also, the sequential combined method provided Number of tank-Velocity-Dispersion coefficient (NVD) curves for convenient evaluation of dispersion coefficient of other rivers or streams. Comparing the previous studies, the present methodology is quite general and simple for determining the effective dispersion coefficients which are applicable for other rivers and streams.
authors.affiliation: Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 500-712, South Korea. firstkh@gist.ac.kr
authors.forename: Kyung Hwa
authors.initials: KH
authors.lastname: Cho
authors.forename: Seungwon
authors.initials: S
authors.lastname: Lee
authors.forename: Young Sik
authors.initials: YS
authors.lastname: Ham
authors.forename: Jin Hwan
authors.initials: JH
authors.lastname: Hwang
authors.forename: Sung Min
authors.initials: SM
authors.lastname: Cha
authors.forename: Yongeun
authors.initials: Y
authors.lastname: Park
authors.forename: Joon Ha
authors.initials: JH
authors.lastname: Kim
mesh_terms: D004058:Diffusion; D004784:Environmental Monitoring / Q000379:methods*; D004926:Escherichia coli; D007723:Korea; D008962:Models, Theoretical; D045483:Rivers / Q000737:chemistry*; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D014874:Water Pollutants, Chemical