KEYSTONE FERRY TERMINAL PROJECT
Puget Sound, Washington
The Keystone Ferry
Terminal is located near the mouth of Admiralty Inlet, near the Strait of Juan de Fuca, in an area
of high waves and currents. Ferries entering the terminal are forced to cancel sailings frequently
due to site conditions and the harbor configuration. Washington State Ferries (WSF) requested that Coast & Harbor Engineering (CHE) perform extensive coastal and hydraulic engineering studies
as part of a ferry terminal improvement project. In addition, WSF is
also considering the use of new larger vessels at the terminal.
CHE performed the following coastal engineering tasks:
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Historical data and literature review |
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Developed over 10 different jetty extension,
removal and re-alignment alternatives for improvement of navigation conditions at
the harbor. |
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Managed field data collection program to obtain
current data at three locations near the project site. |
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Performed 2-D tidal current circulation modeling
with a verified model covering all of Puget Sound, the Strait of Juan de Fuca and the
entire Pacific coastline of WA state and Vancouver Island, BC. |
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Performed 2-D sediment transport modeling for
evaluation of scouring and accretion potentially caused by jetty modification alternatives. |
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Evaluated ongoing maintenance dredging and material placement practices. |
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Performed 2-D water quality modeling to evaluate
effects of proposed project construction on flushing in the harbor and inside adjacent
Crockett Lake. |
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Performed wind-wave transformation and generation
modeling from the Pacific Ocean to the project site with spectral modeling tools. |
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Performed local wind-wave and vessel wake
refraction/diffraction modeling at the site to evaluate the effects of changes in jetty
configuration on wave conditions and sediment transport. |
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Evaluated vessel propeller/jet-induced current
velocities and effects on the harbor bottom using fully 3-D hydrodynamic propeller wash model. |
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Managed and performed physical modeling (40:1 scale)
of currents and waves to evaluate project |
