3
Numerical Model
Objectives and Approach
The numerical model studies had two main objectives:
a. Develop the numerical model application to adequately represent study
areas.
b. Use the numerical model to evaluate wave response at alternative harbor
sites.
The numerical model used for the studies, CGWAVE, is the standard CHL
tool for numerical harbor wave investigations. The model includes the following
assumptions:
a. No wave transmission through breakwaters.
b. No wave overtopping of structures.
c. No testing or optimized structure crest elevations above the water surface.
blunt vertical wall with specified reflection coefficient.
Most of the limitations imposed by these assumptions are not a concern for
the present study. CGWAVE is considered suitable for meeting the numerical
modeling objectives of the Pago Pago Harbor wave response study.
The harbor wave response model is described in the following section,
including a general description of the CGWAVE model and implementation of
the model for the Pago Pago Harbor study. The final section of this chapter
describes the test procedures and calculations.
As part of the test procedures, a suite of incident wave conditions must be
specified at the seaward boundary of the area covered by CGWAVE. Incident
short waves are determined by consideration of the hindcast wave climate outside
the harbor. Incident long waves are specified over a broad range of frequencies,
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Chapter 3 Numerical Model
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