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|Title:||Numerical model predictions of Cumberland Sound sediment redistribution associated with trident channel expansion|
|Authors:||United States. Naval Facilities Engineering Command. Southern Division.|
Granat, Mitchell A.
|Publisher:||Hydraulics Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; HL-90-3.|
Abstract: A previously developed modeling system was used to identify potential areas of sedimentation impact or change associated with Trident channel expansion. The modeling system had been designed and verified to predict average currents and long-term average maintenance dredging requirements for the Kings Bay submarine channel. Excellent numerical model to field submarine channel sedimentation verification was previously demonstrated for the pre-Trident condition. The dramatic shoaling impact, a 150 percent increase in required yearly maintenance, predicted by the model for the tested Trident plan channel condition added to the interest in Cumberland Sound sediment redistribution. Numerical model predictions of long-term average cohesive (clay and silt) and noncohesive (sand and silt) sedimentation (erosion and deposition) patterns within Cumberland Sound are illustrated for pre-Trident and Trident channel conditions. Quantitative assessments should not be attempted for unverified areas; thus, only qualitative trend-type comparisons should be made for the unverified·areas outside the channel area. In general, subtle sedimentation (erosion and deposition) pattern differences between the two conditions are illustrated. The presented results can be used to identify areas of potential impact for consideration in intensifying field monitoring or in modifying the Kings Bay Coastal and Estuarine Physical Monitoring and Evaluation Program. The pre-Trident/Kings Bay area was an efficient sediment trap for cohesive sediments. The lengthened, deepened, and widened Kings Bay area was predicted to become an even more efficient sediment trap. Based upon model predictions, the increased cohesive deposition within the improved Trident/Kings Bay area was associated with material the model predicted would have deposited on and adjacent to marsh areas under pre-Trident channel conditions. Relative to the pre-Trident condition, the model predicted that for the Trident channel condition some of the marsh areas could be sites of reduced cohesive deposition.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Miscellaneous Paper|