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Investigation of Dredged Sediment Movement and Fate
at the Entrance to Brunswick Harbor, Georgia
US Army Corps of Engineers
Savannah District
Engineer Research & Development Center | Coastal & Hydraulics Lab

Nearshore placement of suitable-quality dredged material offers potential benefits and cost savings over conventional dredged material management methods. The U.S. Army Engineer District, Savannah is actively exploring the wider application of nearshore placement in their management of dredged material and has sponsored the monitoring and assessment of thse practices at the Savannah River and Brunswick Harbor navigation channels.

Monitoring of nearshore-placed dredged material from the Brunswick Harbor navigation channel provides opportunities for evaluating numerical models of dredged material fate and sediment transport. Existing dredged material placement practices at Brunswick Harbor include channel-adjacent and nearshore placement of mixed sediments (comprised of sand, silt, and clay) in shallow-water mounds. Similar placement alternatives are being examined for the Dredged Material Management Plan (DMMP) at the Savannah River. A wide variety of field measurements characterizing wave, current, and sediment transport in the study area along with numerical models will be used to evaluate nearshore placement alternatives at the Savannah River navigation channel.

Investigation Objectives:
1. Provide data for assessment of FATE model application in the nearshore environment, including:
    •SSFATE
    •LTFATE
    •PDFATE
    •D-CORMIX
    •ADCIRC
    •STWAVE 		     2. Determine the fate of coarse (sand) and fine (silt/clay) sediment placed in nearshore mounds:
     1 - Are sands separated from fines and do sands re-enter the littoral system?
     2 - Do fines elevate the turbidity in the nearshore area?
     3 - Quantify dredged material re-entering the navigation channel.
Field Data Collection
In addition to model set up and validation, the proposed work includes one year of field data collection that involves two primary tasks:
1 : Field instrumentation to measure wave, current, and suspended solids concentrations at and near the mounds.
2 : Tracer, bathymetry, and sediment bed property studies to monitor the transport and deposition of fine-grained and sand-sized particles from the mounds.
This web site was designed by Carl Miller (Coastal Monitoring Program Manager, USACE), and created by Cliff Baron (Computer Specialist, USACE). Questions, comments, and suggestions on the website should be directed to Mr. Miller at 1-252-261-6840 ext. 240. For further information on the field measurements contact Mr. Miller. For more information on the tracer study and modeling contact the project Principal Investigator Mr. Jarrell Smith (USACE) 1-800-522-6937 ext 4310. For information on the Savannah River and Brunswick Harbor navigation projects contact Mr. Alan Garrett (Project Manager, USACE Savannah District).
The findings in this world wide web site are not to be construed as an official Department of the Army position unless so designated by other authorized documents. The contents of this world wide web site are not to be used for advertising or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. Use of material from this site should credit the U.S. Army Corps of Engineers Engineer Research & Development Center.