Numerical Model Predictions of Cumberland Sound Sediment Redistribution Associated with Trident Channel Expansion

• Main Author: Granat, Mitchell A.
• Other Authors: ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS HYDRAULICS LAB
• Format: Text
• Language: English
• Published: 1990
• Subjects: Physical and Dynamic Oceanography; Civil Engineering; *MAINTENANCE; *DREDGING; *SEDIMENTATION; *CHANNELS(WATERWAYS); SAND; ENVIRONMENTAL IMPACT; DEPOSITION; EROSION; MATHEMATICAL PREDICTION; SOUNDS(WATERWAYS); CLAY; EXPANSION; SUBMARINES; SEDIMENTS; BAYS; SILT; DISTRIBUTION; REQUIREMENTS; MATHEMATICAL MODELS; TEST AND EVALUATION; PLANNING; *SUBMARINE CHANNELS; KINGS BAY(GEORGIA); CUMBERLAND SOUND; Cumberland Sound; Trident; Kings Bay
• Online Access: http://www.dtic.mil/docs/citations/ADA224170; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA224170

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. Original contains color plates: All DTIC reproductions will be in black and white.