Sediment deposition in constructed wetland ponds with emergent vegetation: laboratory study and mathematical model

Retention of suspended particles by settling is among the main physical treatment processes in constructed wetland ponds. Laboratory experiments were conducted to study the transport and deposition of suspended particles in the slow, near-stagnant flows typical of constructed wetland ponds with emer...

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Bibliographic Details
Published in:Water science and technology 2005-01, Vol.51 (9), p.307-314
Main Authors: Schmid, B H, Stephan, U, Hengl, M A
Format: Article
Language:English
Subjects:
Artificial wetlands
Biodegradation, Environmental
Deposition
Ecosystem
Emergent aquatic plants
Emergent vegetation
Laboratories
Mathematical analysis
Mathematical models
Models, Theoretical
Particle Size
Plant Development
Pond construction
Ponds
Sediment
Sediment transport
Transport
Vegetation
Waste Disposal, Fluid - methods
Water Movements
Wetlands
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Summary:Retention of suspended particles by settling is among the main physical treatment processes in constructed wetland ponds. Laboratory experiments were conducted to study the transport and deposition of suspended particles in the slow, near-stagnant flows typical of constructed wetland ponds with emergent vegetation. The presence of stems was found to create a velocity field which is much more uniform than its counterpart without vegetation. This property was used to obtain an approximate mathematical model, for which an analytical solution could be given to describe sediment transport and deposition. The deposition rates predicted by this formula were compared to the data from the above-mentioned laboratory experiments and found to agree closely.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2005.0342