Vessel Quotas and Operating Requirements Vessel Quotas and ...

TABLE 1MAXIMUM WAVE AMPLITUDES GENERATED BY A SERIES OF VESSELS AT A SPEED OF 10 KNOTS AS PRESENTED BY
SORENSEN (1973).
Distance from sailing line
100 ft 500 ft
Vessel Length Beam Draft Displacement Height Height
ft ft ft tons ft ft
Cabin Cruiser 23 8.25 1.7 3 1.1 0.8
Coast Guard Cutter 40 10 3.5 10 1.6 1
Tugboat 45 13 6 29 1.6 0.9
Fishing boat 64 12.8 3 35 1.8 0.7
Fireboat 100 28 10.5 343 1.6 1
3.4 DESIGN WAKE ASSUMPTIONS
• Design Wake height is 1 foot. This is the maximum wave height expected for any of the vessels
permitted in Glacier Bay proper and therefore is protective of the coastline.
• All vessels within 2,000 feet of the shoreline will have a design wake of 1-foot. (See “Vessel
Track Analysis Methodology” for information on the selection of 2,000 feet from the shoreline
for analysis purposes).
• Vessels generate 15 wake waves. This is the maximum number of waves that will intercept the
shoreline at any one point from a passing vessel.
• All wake energy is assumed to be directed perpendicular to the shore.
4 GLACIER BAY PROPER ANALYSIS METHODOLOGY
4.1 METHODOLOGY FOR CONDUCTING WAKE ANALYSIS OF GLACIER BAY PROPER
PN&D analyzed the collected data and chose specific sites that will require detailed evaluation. This was
done by:
• evaluating vessel track data for proximity to shoreline to determine the number of vessels that
come within 2,000 feet of the shoreline for the energy index calculation
7