Accession Number ADA572117
Title Littoral Sediment Budget for the Mississippi Sound Barrier Islands.
Publication Date Jul 2012
Media Count 184p
Personal Author J. D. Rosati J. L. Berlinghoff M. R. Byrnes S. F. Griffee
Abstract Shoreline and beach evolution for the barrier islands fronting Mississippi Sound are driven by longshore transport processes associated with storm and normal wave and current conditions. Although beach erosion and washover deposition are processes that have influenced island changes, the dominant mechanism by which sand is redistributed along the barrier islands and in the passes is by longshore currents generated by wave approach from the southeast. Historical shoreline and bathymetric survey data were compiled for the barrier islands and passes fronting Mississippi Sound to identify net littoral sediment transport pathways, quantify the magnitude of net sand transport, and develop an operational sediment budget spanning a 90-year period. Net littoral sand transport along the islands and passes is primarily unidirectional (east-to-west). Beach erosion along the east side of each island and sand spit deposition to the west result in an average sand flux of about 300,000 to 400,000 cy/yr throughout the barrier island system. Dog Keys Pass, located updrift of East Ship Island, is the only inlet acting as a net sediment sink and is the widest pass in the system (about 6 miles). As such, a deficit of sand exists along East Ship Island. Littoral sand transport decreases rapidly along West Ship Island, where exchange of sand between islands terminates because of wave sheltering from shoals and islands of the old St. Bernard delta complex, Louisiana. These data are being used to assist with design of a large island restoration project along Ship Island, Mississippi.
Keywords Bathymetric change
Bathymetry
Bruun rule calculations
Coastal engineering
Coastal regions
Dredging
Geomorphology
Horn island
Island restoration
Islands
Littoral drift
Mississippi sound barrier islands
Navigation channel dredging
Ocean bottom
Ocean currents
Petit bois island
Sand
Sand transport
Sea level
Sediment budgets
Sediment transport
Ship island
Tides
Tropical cyclones
Uncertainty


 
Source Agency Non Paid ADAS
NTIS Subject Category 47C - Physical & Chemical Oceanography
48E - Soil Sciences
50D - Soil & Rock Mechanics
Corporate Author Army Engineer Waterways Experiment Station, Vicksburg, MS. Coastal Hydraulics Lab.
Document Type Technical report
Title Note Final rept.
NTIS Issue Number 1316
Contract Number N/A

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