Figure 60. Router rough-cut of bathymetry
A smaller ball-head bit was used to "finish cut" the section. This proceeded
at a much slower rate that varied depending on depth of bathymetry and how
rapidly the depths changed. For sections that required cutting across the entire
1.22-m (4-ft) width, the finish cut progressed along the long dimension of the
model at about 3.81 cm/hr (1.5 in./hr). This rate improved on sections of the
model where the channel was narrower and only covered a small portion of the
1.22-m (4-ft) width. Figure 61 shows the finish cut complete for the first section
and in progress on the second section.
After the entire model was carved, the milled surface of each section was
polished, and the vertical shorelines were cut and added to the model. Figure 62
shows a portion of the completed model looking upstream from a viewpoint
south of Fire Island. (Notice the vertical shorelines being added to the model.)
Figure 63 is a view looking southward toward Cairn Point. The vertical
shorelines had not been added when this photograph was made. Close-up views
of the model bathymetry are shown in Figures 64 and 65. Keep in mind this
model has a 1:15 model distortion, so the actual horizontal distances in the
prototype are stretched out relative to the depth, and the slopes are much milder.
78
Chapter 7 Three-Dimensional Cook Inlet Model
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