Scaling dispersion model for pollutant transport in natural rivers

Document Type

Conference Proceeding

Publication Date

12-1-2005

Abstract

Scaling dispersion is hypothesized as the mechanism underlying the non-Fickian longitudinal dispersion process in natural streams. Using this mechanism, a new model, called scaling dispersion model, is developed to simulate pollutant transport in natural rivers and streams. The model is comprised of (1) a fractional advection-dispersion-reaction equation, (2) a parameter estimation method based on the Laplace transform of fractional order differential equations, and (3) a semi-Lagrangian F.3 central difference scheme devised to evaluate the solution of the fractional differential equations. Dispersion characteristics computed by the scaling dispersion model were in good agreement with those observed by 20 dye tests conducted in natural rivers, thereby demonstrating the efficacy of the scaling dispersion model for prediction of the non-Fickian dispersion process in natural rivers and streams. Copyright ASCE 2005.

Publication Source (Journal or Book title)

World Water Congress 2005: Impacts of Global Climate Change - Proceedings of the 2005 World Water and Environmental Resources Congress

First Page

439

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