Perry, Frederick C. Jr.
[Author];
Seabergh, William C.
[Author];
Lane, Edgar F.
[Author]
;
United States. Army. Corps of Engineers. Charleston District.
[Contributor]
Improvements for Murrells Inlet, South Carolina: Hydraulic Model Investigation
Footnote:
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Description:
Source: https://erdc-library.erdc.dren.mil/jspui/ ; Murrells Inlet, located 13 miles southwest of Myrtle Beach, South Carolina, is a natural channel through a sandy beachline that conducts tidal flows between the Atlantic Ocean and a well-mixed lagoon of ocean salinity surface which has no source of freshwater inflow other than local runoff. The inlet provides passage from the ocean to docking facilities for charter craft, commercial fishing vessels, and private boats. However, due to the influx of sand into the inlet, an environment of shallow shifting-sand shoals and breaking waves produces difficult and dangerous navigation conditions. A project for the improvement and stabilization of the inlet was authorized in November 1971. A model study was performed to aid in preconstruction planning and design of structural solutions to the problem of providing a stabilized channel of sufficient depth and width with provisions for sand bypassing. The Murrells Inlet fixed-bed model, constructed of concrete to scales of 1:200 horizontally and 1:60 vertically, accurately reproduced the lagoon and a region of the ocean near the inlet, an area of approximately 14.2 square miles. After a least-squares harmonic analysis of prototype tidal data for amplitude and phase of various tidal constituents, a successful hydraulic model verification was made based on the M? constituent. The model study examined a variety of plans in order to optimize the alignment and spacing of jetties and the proper alignment of interior channels with respect to current patterns. Also, the effects of the plans on bay tidal elevations and tidal currents were determined as were the effects on wave heights. Model testing concluded that plan 1H was the optimal plan for providing a stable entrance channel while providing for sand bypassing. The plan included : (A.) A north quarrystone jetty composed of a 1,330-ft-long low weir section constructed to a +2.2 ft mlw elevation flanked by a 1,505-ft-long seaward section and a 518- ft-long shoreward section, ...