CETN I-63
March 1999
Figure 2. Six degrees of freedom of rigid body motion for ships
and station keeping ability of the ship, hence determining the required channel width. Vessel
responses are uniquely defined for a given ship geometry and weight distribution and vary with
the ship's forward speed, bathymetry, and environmental conditions along the ship track.
DESIGN VESSEL REQUIREMENTS FOR CHANNELS: A design vessel (a set of design
vessels) is (are) chosen for channel design projects. The pertinent USACE guidance states the
following:
"For deep-draft projects, the design ship or ships is/are selected on the basis of economic
studies of the types and sizes of the ship fleet expected to use the proposed channel over the
project life. The design ship is chosen as the maximum or near maximum size ship in the
forecasted fleet" (USACE 1984, 1995, 1999).
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