Abstract

Mass exchange between river stream and riverbed is critical towards remediation of contaminated river system. Spatial moment analysis of reactive and radioactive solute in river channel with underlying porous bed is applied to understand the qualitative description of solute plume in riverbed and river stream. Semi-analytical solutions for zeroth-, first- and second-order spatial moment of reactive and radioactive solute are derived in Laplace domain. The spatial moments of concentration are numerically inverted. Parabolic velocity in river channel and exponentially decaying velocity in porous bed are linked using a slip velocity at the interface. The model is verified against the semi-analytical solution for zeroth moment of conservative solute. The model was applied to understand the relative impact of sorption and decay on the transport of solute plume released in a river system. Sorption was assumed to be limited in the riverbed; hence, the zeroth moment of solute in the river stream remains unchanged for different rates of retardation. The model can be applied to verify numerical models or to predict qualitative description of solute concentration and extent of contamination in a river system. © 2012 CIWEM.

Department(s)

Geosciences and Geological and Petroleum Engineering

Publication Status

Full Access

Keywords and Phrases

Decay; Moment analysis; Porous media; Reactive transport; Sorption

International Standard Serial Number (ISSN)

1747-6593; 1747-6585

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Wiley, All rights reserved.

Publication Date

01 Jan 2014

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