Diffusive Behavior of Bedform-Induced Hyporheic Exchange in Rivers
Publication: Journal of Environmental Engineering
Volume 131, Issue 9
Abstract
Solute transport in natural streams is a complex phenomenon that involves both in-stream dispersion and mass exchange with the porous zones surrounding the water body. Due to the complex nature of the riverine systems several models may be used to simulate and analyze the transport of solutes with different degrees of complexity. The bedform-induced hyporheic transport is a stream-subsurface exchange mechanism that can be reproduced in controlled systems, such as laboratory flumes. Application of a simple Fickian diffusion model to laboratory data obtained with passive solutes and stationary bedforms proves successful within a range of durations of the contamination process. A dimensionless form of the diffusion coefficient, scaled with dynamic, physical, and geometric properties of the system is derived by comparison with another physically based model. A prediction of the dimensionless diffusion coefficient is obtained as a function of the timescale of the exchange process and is validated with a few sets of results from laboratory tests.
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Acknowledgments
This work was funded by the Italian National Research Council (CNR), National Group on the Defence from Chemical-Industrial Environmental Hazards (GNDRCIE); the Italian-Israeli Cooperation on Environmental Technologies, Project “An Integrated Approach to the Remediation of Polluted River Sediments”; by CO.RI.LA. (Consortium for Research on Venice Lagoon).
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Information & Authors
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Published In
Journal of Environmental Engineering
Volume 131 • Issue 9 • September 2005
Pages: 1260 - 1266
Copyright
© 2005 ASCE.
History
Received: Jun 2, 2004
Accepted: Dec 1, 2004
Published online: Sep 1, 2005
Published in print: Sep 2005
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