Advection models of longitudinal dispersion in rivers

Title

Advection models of longitudinal dispersion in rivers

 Author

Kranenburg, C.

Faculty

Civil Engineering and Geosciences

 Date

1996

 Abstract

A derivation is presented of a general cross-section averaged model of longitudinal dispersion, which is based on the notion of the advection of tracer particles. Particle displacement length and particle travel time are conceived as stochastic variables, and a joint probability density function is introduced to arrive at an integral advection model for the cross-section averaged concentration. Starting from this model special advection models known from the literature are obtained in a consistent way. These models, in which only the travel time is a stochastic variable, predict skewed tracer concentration contributions of the kind observed in the field, but satisfy the condition of approach to Gaussian behaviour for large spreading times. A relationship between the particle displacement length and the longitudinal dispersion coefficient is derived. The application of advection models to non-uniform rivers and the relationship with the dead-zone model are outlined.

 Subject

morphology
rivers

 To reference this document use:

http://resolver.tudelft.nl/uuid:ae713383-4e76-43a1-9d11-48f08ae7e66d

 Publisher

TU Delft

 ISSN

0169-6548

 Source

Communications on hydraulic and geotechnical engineering, No. 1996-01

 Part of collection

Institutional Repository

 Document type

report

 Rights

(c) TU Delft
Files
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