SETTLING OF FINE SEDIMENT IN A CHANNEL WITH EMERGENT VEGETATION

The potential for enhanced removal of sediment from flowing water in a channel by means of settling on vegetation was studied theoretically and experimentally. Settling on vegetation was modeled as a distributed sink of sediment with vegetation spread throughout depth and length of the channel. Sediment-capture experiments were performed in a laboratory channel using model vegetation and well-sorted silt. The theory predicts that settling on vegetation has the potential to increase sediment-capture efficiency considerably, and this was demonstrated in the experiments. The enhancement of sediment removal was greater for artificial vines than for inclined strips. For the runs with flow velocities greater than 10 mm/s the sedimentation efficiency was less than predicted. The reduced efficiency could be related to bed destabilization (which was observed in some runs), re-entrainment from the vegetation, or sediment sliding off the vegetation.

Availability:
- Find a library where document is available. Order URL: http://worldcat.org/oclc/8672558
Corporate Authors:
American Society of Civil Engineers

1801 Alexander Bell Drive
Reston, VA United States 20191-4400
Authors:
- Elliott, A H
Publication Date: 2000-8

Language

English

Media Info

Features: Appendices; Figures; References; Tables;
Pagination: p. 570-577
Serial:
- Journal of Hydraulic Engineering
- Volume: 126
- Issue Number: 8
- Publisher: American Society of Civil Engineers
- ISSN: 0733-9429
- Serial URL: https://ascelibrary.org/journal/jhend8

Subject/Index Terms

TRT Terms: Channel flow; Channels (Waterways); Experiments; Filtration; Laboratory tests; Sedimentation; Sediments; Silts; Vegetation
Subject Areas: Environment; Highways; Hydraulics and Hydrology; Marine Transportation; I26: Water Run-off - Freeze-thaw;

Filing Info

Accession Number: 00797203
Record Type: Publication
Contract Numbers: 59890200, BD-2775/93, 604/11/13093
Files: TRIS
Created Date: Aug 7 2000 12:00AM