2
The Model
Model Design
Model experiments were conducted at a geometrically undistorted linear
scale of 1:48.4, model to prototype. Scale was based on the size availability of
model armor units and the capabilities of the available wave generator to
produce required wave heights at modeled water depths. Time relations were
scaled according to Froude Model Law (Stevens et al. 1942) and model-proto-
type relations were defined in terms of length l and time t shown in Table 1.
Table 1
Model-Prototype Scale Relations (1:48.4 scale)
Scale Relations
Characteristic
Dimension
Model:Prototype
Length
l
lr = 1:48.4
l2
Area
ar = 1:2342.6
l3
Volume
vr = 1:113,380
l 1/2
Time
tr = 1:6.96
The specific weights of water and construction materials differed between the
model and prototype; therefore, the transference equation of Hudson (1975) was
used to determine model material weights:
3
3
(Sa)p
lm
(Wa)m
1
( a)m
(1)
lp
(Sa)m
(Wa)p
1
( a)p
where
m = model quantities
p = prototype quantities
6
Chapter 2 The Model
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