A fixed-bed model of Brunswick Harbor, constructed to scales of 1:500 horizontally and 1:100 vertically, reproduced approximately 67 square miles of prototype area beginning in St. Simons Sound and extending to the upper portions of the Brunswick and Turtle Rivers and including all of East River and Academy Creek, the extensive system of saltwater creeks and marshes that affect tidal action in the area, and the Intracoastal Waterway from Brunswick River through Jekyll Creek to the U. S. Highway 84 Bridge. The model was equipped with the necessary appurtenances for the accurate reproduction of tides, tidal currents, shoaling patterns, and other significant prototype phenomena. The primary purpose of the model study was to test the effectiveness of proposed plans for the reduction of shoaling in Brunswick Harbor; however, tests of plans to reduce shoaling in Jekyll Creek were later added to the overall testing program. Model verification tests indicated that the hydraulic and shoaling regimens were in satisfactory agreement with those of the prototype for comparable conditions. It therefore can be assumed that the model provided quantitative answers concerning the effects of the proposed improvement plans on the hydraulic regimen of the prototype area reproduced in the model and reliable qualitative answers as to the effects of proposed improvements on shoaling rates and patterns in navigation channels. It was determined that closure of the East River channel was the only scheme tested which could effect significant reduction of shoaling. Schemes to increase current velocities or turbulence were unsuccessful in reducing channel shoaling in the critical reach of East River. It was concluded that deepening the navigation channel from 30 ft to 36 ft will reduce shoaling in East River and increase shoaling in Turtle and Brunswick Rivers, even if no additional improvement works are constructed. A plan consisting of 10,150 ft of impermeable training walls was developed for reducing shoaling in Jekyll Creek. This plan reduced overall shoaling in the channel and shifted substantial amonntz of shoal material from areas of high-cost maintenance to areas of low-cost maintenance. A series of dye dispersion tests was conducted in the model to determine the dispersion of wastes from the Brunswick Pulp and Paper Company into Turtle River and from the Brunswick sewage treatment plant into Academy Creek. The results of these tests are presented in Appendix A. A brief summary of the prototype shoaling tests conducted by the Savannah District to determine effects of the partial closure plan of the East River is presented in Appendix B. _x000D_ _x000D_ NOTE: This file is large. Allow your browser several minutes to download the file.
Plans for Reduction of Shoaling in Brunswick Harbor and Jekyll Creek, Georgia: Hydraulic Model Investigation
Technical Report ; H-72-5
1972
20560822
Report
Elektronische Ressource
Englisch
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