ASRC Seminar Series - Pollutant Modeling in Rivers

Event Date: Monday - Tuesday

Speaker: Dr. Seo, currently a Professor at the Seoul National University in Seoul, S. Korea

Focusing on two-dimensional (2D) mixing in natural rivers and open channels this presentation outlines the necessary field work and subsequent analysis to successfully identify mixing coefficients for a 2D pollutant transport model. When pollutants are introduced into rivers, the mixing length of the intermediate field is very long compared to the first stage. To properly map this process, one needs to identify both the transverse and longitudinal mixing characteristics of the pollutant which is done through deploying the two-dimensional advection-dispersion equation (2D ADE). The equation contains both advection and dispersion terms which are controlled via a longitudinal and a transverse dispersion coefficient. Methods for determination of the dispersion coefficients can be classified into two categories; 1) observation methods, and 2) prediction methods. When observed concentration data are available, the dispersion coefficients can be calculated using the observation methods. Otherwise the dispersion coefficients must be estimated by prediction methods based on the velocity profiles and empirical relations. In this presentation, we report on the experimental methods for tracer tests that we carried out using different experimental settings, such as natural rivers and large-scale experimental channels, as well as on the methods for determination of dispersion coefficients using the field data

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