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Title: Kings Bay coastal processes numerical model
Authors: Vemulakonda, S. Rao.
Scheffner, Norman W.
Earickson, Jeff A.
Chou, Lucia W.
Keywords: Coast changes--Mathematical models
Harbors--Hydrodynamics--Mathematical models
Sediment transport--St. Mary's Inlet--Mathematical models
St. Mary's Inlet (Fla. and Ga.)
Publisher: Coastal Engineering Research Center (U.S.)
Abstract: Abstract: St. Marys Inlet is the main ocean entrance to the Naval Submarine Base, Kings Bay, Georgia. In order to accommodate Trident submarines at the base, it became necessary to modify the exterior navigation channel. This report describes details of a numerical modeling effort performed to study the effects of channel modifications on coastal processes near the inlet, especially channel shoaling rates. A system of numerical models, which included models for tides, waves, wave-induced currents, and noncohesive sediment (sand) transport, was used in the study. The system, together with two computational grids, was called Model B. It was used to study existing (base) as well as planned conditions. Plan 1 is to widen the navigation channel by 100 ft, deepen the channel to -49 ft mlw (46-ft project depth plus 3-ft advance maintenance), and extend the channel on the ocean side with a 20-deg bend to the south. Model B considered the simultaneous sand-tightening of a 1,000-ft segment of the south jetty. The tidal model was verified using field data taken on 10 November 1982. The average year's wave climate for the study area was obtained from 20-year hindcast data. The dataset included normal storms (but not hurricanes and tropical storms). It was used in running the wave and wave induced current models. The sediment transport model determined noncohesive sediment (sand) transport in the study area under the action of tides, waves and wave-induced currents. It considered a mean tide and the average year's wave climate. It was verified by comparing computed erosion/deposition rates in the navigation channel with those obtained from field surveys taken during 1980-81. There was good agreement both with respect to trends and magnitudes. While all four models were run for base conditions, only the tidal model and the sediment transport model were run for Plan 1 conditions to meet the urgent need for model results. Based on the model results and available information, recommendations on advance maintenance dredging are made for various reaches of the navigation channel.
Description: Technical Report
Appears in Collections:Technical Report

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