Georgetown Harbor,South Carolina. Report 2. Effects of Various Channel Schemes on Tides,Currents,and Shoaling. Hydraulic Model Investigation.

摘要

The Georgetown Harbor model, a fixed-bed model constructed to linear scale ratios of 1:800 horizontally and 1:80 vertically, reproduced a portion of the Atlantic Ocean, Winyah Bay including Mud Bay, North Inlet and marshes between Winyah Bay and North Inlet, the Sampit River including Georgetown Harbor, and the lower portions of the Pee Dee, Black, and Waccamaw Rivers and adjacent marshes. The model was equipped with necessary appurtenances for the accurate reproduction and measurement of tides, tidal currents, salinity intrusion, freshwater inflow, and shoaling distribution. The purposes of the model study were (a) to determine the effects on the hydraulic, salinity, and shoaling characteristics of a deepening from 27 to 35 ft of the main navigation channel to Georgetown Harbor and (b) to determine whether present maintenance dredging can be reduced by proposed plans involving channel revisions, sediment traps, and freshwater flow diversion. This report presents and analyzes the results of the testing of the following schemes: Western Channel and Turning Basin scheme (Plans 1, 1A, and 2-6), Marsh Island Channel and Turning Basic scheme (Plan 7), Upper Winyah Bay Side Channel Trap scheme (Plans 8 and 9), Inflow Diversion scheme (Plan 10), and Deepened Channel scheme (Plan 11).