CGWAVE uses the finite-element method, which is a powerful approach for

modeling coastal phenomena in regions of complex shape. In the case of a group of

scatterers surrounded by an open sea of constant depth, the incident wave may be written

as (Demirbilek and Gaston, 1985)

∞

= A ∑ εn i n J n (kr)cos n(θ - θI )

ikr cos(θ- θI )

ηI = Ae

(15)

$

n =0

where A is the amplitude of the incident wave, θI is the incident wave angle with respect

to the x-axis, Jn is the n-th order Bessel functions of the first kind and

1 when n = 0

εn =

(16)

2 when n ≠ 0

The incident direction is defined such that the incident wave travels in the positive x-

direction when θI is equal to zero; the x-direction is obtained from the bathymetry data file

that is input to the CGWAVE program. This bathymetry file should be oriented such that

the x-axis points to the east.

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