A number of different numerical codes were required to build a complete, integrated model of the environment.  Accurate tidal flows and water levels were provided by a finite element model of the region.  Wind wave predictions for the area were obtained using three wind-wave models of the region, oriented to match dominant wind directions.  Predictions of the temporal and spatial wake train patterns produced by POFF and non-POFF vessels were obtained using the LSV model, which was developed in Phase 1 of the study.  The results of these detailed models were used to build a new integrated impact assessment model, ProfileAnalysis, which was the primary tool for investigating the impacts of tides, waves and wakes on the shores of the study area.  Unlike the detailed models, ProfileAnalysis can be used to simulate many months at a time, which is required in order to assess the processes that affect beach evolution.  As well as hydrodynamics calculations (flows, waves and wakes), the model computes processes such as sediment transport and profile evolution.  

Wake height predicted by LSV for Bremerton to Seattle route at 37 knots: Snohomish (top); Spirit (bottom)

Integrated Modeling of Wake Impacts

Seattle- Bremerton

Passenger Only Fast Ferry Study