Energy Model to Predict Suspended Load Deposition Induced by Woody Debris: Case Study

Large woody debris (LWD) has been used repeatedly to create aquatic habitats. This study attempts to quantify and predict geomorphological changes induced by LWD. Six cylindrical bundles of LWD were anchored in a stream in central Ohio, and bed elevations were monitored for up to seven months. A model was developed to predict deposition downstream of the LWD. Sediments accumulated immediately downstream of the LWD structures. The average accumulation depth 0.25 m downstream of the LWD was 0.0m. At 1.25 m downstream accumulation averaged 0.07 m. The model to predict the sediment deposition had values of 0.87-0.77 respectively, at the two downstream locations. The most important terms in the model were the Froude number and bankfull depth. An advantage of this model was the use of easily measurable variable including average bankfull velocities, depth, and cross sectional area. This fact will facilitate the use of the model in field settings. Suggestions for future improvements to the model include calibration of different streams, inclusion of a temporal variable, and sediment characteristics.

Availability:
- Find a library where document is available. Order URL: http://worldcat.org/oclc/8672558
Authors:
- Stewart, Terry L
- Martin, Jay F
Publication Date: 2005-11-1

Language

English

Media Info

Media Type: Print
Features: Figures; References; Tables;
Pagination: pp 1011-1016
Serial:
- Journal of Hydraulic Engineering
- Volume: 131
- Issue Number: 11
- Publisher: American Society of Civil Engineers
- ISSN: 0733-9429
- Serial URL: http://scitation.aip.org/hyo/

Subject/Index Terms

TRT Terms: Aquatic life; Bridges; Case studies; Debris flows; Dissipation; Drag; Froude number; Habitat (Ecology); Suspended sediments; Wood
Uncontrolled Terms: Sediment transport
Subject Areas: Bridges and other structures; Energy; Environment; Geotechnology; Highways; Hydraulics and Hydrology; I51: Earthworks and Soil Drainage;

Filing Info

Accession Number: 01006727
Record Type: Publication
Files: TRIS
Created Date: Oct 31 2005 12:46PM