| Summary: | Computer models are nowadays routinely used in harbor engineering
applications. Models based on the two-dimensional elliptic mild-slope equation can
simultaneously simulate refraction, diffraction, reflection, and dissipation in completely
arbitrary coastal domains. However, floating structures such as floating breakwaters and
docks are often encountered in the modeling domain. This makes the problem locally 3-
dimensional. Hence it is problematic to incorporate a floating structure into the 2-d
model. Tsay and Liu (1983) proposed a highly simplified but approximate approach to
handle this problem practically. The validity of their approach is examined in detail and
it is found that the actual solutions deviate considerably from the theoretical solutions,
although their approximation provides results with the correct trend. Therefore,
correction factors have been developed and may be used to produce more reliable results
using the framework of Tsay and Liu (1983). The resulting method is applied to Douglas
harbor in Alaska. The result shows that docks in the harbor distort the wave field
considerably and create a reflective pattern that can affect navigation safety in some
areas. Also plots are developed for the transmission coefficients for waves propagating past rectangular and cylindrical floating objects of infinite extent for a wide range of
conditions encountered in practice.
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