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Title: Navigation channel improvement, Gastineau Channel, Alaska : hydraulic model investigation
Authors: United States. Army. Corps of Engineers. Alaska District.
Herrmann, Frank A.
Keywords: Channel improvements
Gastineau Channel
Hydraulic models
Navigation channels
Sediment transport
Issue Date: Nov-1972
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; H-72-9.
Description: Technical Report
Abstract: The existing Federal project through the Gastineau Channel, Alaska, provides for a navigation channel 4 ft deep at mllw (including overdepth dredging) with a bottom width of 75 ft. The channel was constructed in 1959-60 through an area with a prevailing bottom elevation of +10 to +15 ft mllw and soon experienced rapid shoaling at several locations. No maintenance dredging has been performed, primarily because of the large cost of moving a dredge to this remote area. A model study was conducted to determine the best means of resolving the shoaling problem. The model, constructed to linear scale ratios of 1:500 horizontally and 1:100 vertically, reproduced about 7 miles of Gastineau Channel from Fritz Cove on the west to l mile north of Juneau, Alaska, on the east. It was equipped to reproduce and study prototype tides, tidal currents, fresh water inflow, and shoaling. The shoaling tests were conducted using granulated plastic to simulate the natural sediments, and a technique was developed to properly reproduce the prototype shoaling pattern and distribution. It was determined from the model tests that any one of several impermeable dikes with a top elevation above high water and located along the north side of the navigation channel would reduce shoaling by 80 to 85 percent. Diversion of Fish Creek away from the navigation channel would result in an additional 5 percent reduction. The shortest dike tested (plan 4) was 17,250 ft long, and the shoaling reduction for this plan was essentially the same as that for longer dikes. NOTE: This file is large. Allow your browser several minutes to download the file.
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