Accession Number : ADA954655

Title :   Survey Report on Cooper River, South Carolina (Shoaling in Charleston Harbor), Appendix A. Sources of Shoaling Material.

Corporate Author : CORPS OF ENGINEERS CHARLESTON SC CHARLESTON DISTRICT

Report Date : JUL 1966

Pagination or Media Count : 135

Abstract : The purpose of this study was to delineate the sources of the material responsible for the large increase in shoaling in Charleston Harbor following the admission of Santee River waters in 1942. In a real sense, there are both sources and causes, and the causes seem to be more significant than the sources. For example, a certain volume of sediment was available for shoaling prior to 1942, but the same original volume of sediment was, according to hydraulic model studies, responsible for about 80 percent more shoaling after 1942 than it caused before then. The cause: increased fresh water inflow alone. Again, a large fraction of the total dredging consists of material that has to be rehandles; that is, runback from previous dredging. The causes: a change in the character of the material requiring removal from sand to fluid mud; the time lag required to ascertain the ineffectiveness of spoiling methods, and to institute changes; but the relevant cause was the occurrence of this fluid mud which could be handled only with this degree of effectiveness. And the more remote cause was a change in the salinity regime of the harbor induced, again, by large fresh water inflows.

Descriptors :   DELAY, DREDGING, FLOW, FLUIDS, FRESH WATER, HYDRAULIC EQUIPMENT, MATERIALS, MODELS, MUD, RIVERS, SALINITY, SAND, SEDIMENTS, SOURCES, SOUTH CAROLINA, VOLUME, WATER

Subject Categories : Hydrology, Limnology and Potamology
      Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE