Accession Number : ADA954248

Title :   Source of Materilas and Cause of Sediment Deposition in Charleston Harbor,

Corporate Author : CORPS OF ENGINEERS ATLANTA GA SOUTH ATLANTIC DIV

Personal Author(s) : Neiheisel,J.

Report Date : JUL 1965

Pagination or Media Count : 58

Abstract : Clay composition and heavy-mineral analysis of more than 100 sediment samples within the physiographic unit comprising Charleston Harbor watershed reveal mineral ratios which are diagnostic to the source area. Ratios of hornblende and kaolinite indicate a Piedmont source sedimentr superimposed on typical residual Coastal Plain sediment in the shoal areas of Charleston Harbor; such overlap began in February 1942 when the Santee watershed was diverted to Charleston Harbor via the Cooper River. Sediment movement, as suspended load, from the source area to deposition site, is delineated by the clay-mineral ratio while bed load movement is reflected in sand-size hornblend ratios and sedimentary parameters. Movement of sediment to the shoal areas in Charleston Harbor is perdominately from the upland source via Cooper River and lesser amouints through the tidal inlet. Factors regulating locaton of shoaling areas in Charleston Harbor include (1) hydrologic cycle control of sediment supply from the watershed, (2) density currents of the partly mixed estuary effecting longer duration of bottom flood flow than the bottom ebb flow, (3) Coriolis force effect on net tidal propagation, and (4) induced low energy zones at junctions of rivers.

Descriptors :   BOTTOM, CLAY, COASTAL REGIONS, CONTROL, CORIOLIS EFFECT, CURRENTS, DENSITY, DEPOSITION, FLOODS, FLOW, GEOMORPHOLOGY, HARBORS, HYDROLOGY, INLETS, KAOLINITE, LOW ENERGY, MINERALS, OVERLAP, PROPAGATION, RATIOS, RESIDUALS, SCHIST, SEDIMENT TRANSPORT, SEDIMENTS, SHALLOW WATER, SHORES, SILICATES, SITES, SOURCES, SUPPLIES, TIDES, TIME, WATERSHEDS

Subject Categories : Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE