SOURCE AND DISTRIBUTION OF SEDIMENTS AT BRUNSWICK HARBOR AND VICINITY, GEORGIA.
ARMY COASTAL ENGINEERING RESEARCH CENTER WASHINGTON D C
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The distribution patterns of bottom sediment in Brunswick Harbor and vicinity, Georgia, reflect the long-term hydrodynamic response and generally correlate with dynamic factors affecting sedimentation. Certain diagnostic minerals reflect the source area and are used as natural tracers to delineate direction of sediment movement. Analysis of sedimentary parameters also enables interpretation of direction of sediment transport. The results of this investigation indicate that shoaling presently occurring in Brunswick Harbor is related to materials from a source in the Altamaha River. Sediment contribution to shoaling is introduced into the harbor through the tidal inlet between the barrier islands and from the MacKay River during greater than average discharge rates of the Altamaha River. Shoaling rates in the harbor also correlate with discharge rates of the Altamaha River. This investigation demonstrates the value of sediment interpretation, based on knowledge of regional geology, to provide a basis for analysis of sediment movement in a coastal area. In such a complex coastal area as Brunswick, Georgia, the sediment characteristics augment hydraulic measurements and enable a more complete interpretation of the hydrodynamics involved. Such information has application to engineering design of coastal structures. Author